Stacked Thrust Electric Push Rod

Abstract

Superimposed thrust electric push rod. It has a push rod device (4), a motor (5) and a one-way control mechanism (9). The rotating shafts in the transmission system include a motor shaft (5a), a threaded rotating shaft (4a) in the push rod device (4), a connecting shaft (9a) and a connecting rotating shaft (9b) in the one-way control mechanism (9). One end of the connecting rotating shaft is connected to the motor shaft, the other end of the connecting rotating shaft is connected to one end of the clutch mechanism (11), the other end of the clutch mechanism is connected to one end of the connecting shaft (9a), and the other end of the connecting shaft (9a) is connected to the inner end of the threaded rotating shaft; a normally closed one-way braking mechanism (10) is provided on the connecting shaft, and a one-way bearing (20) is provided on the connecting rotating shaft; there are a first spring member (7) and a second spring member (16) in the push rod device. After the first spring member exerts a first thrust on the pushed member, a superimposed thrust is achieved again, which can improve the reliability of the operation effect and the stability of the operation process.

Description

Technical Field:

[0001] The present invention relates to an electric push rod, specifically an electric push rod with superimposed thrust, which is applicable not only to brakes but also to other devices or apparatuses with operating conditions similar to those of brakes. Background Art:

[0002] Figure 1 FIG. is a schematic structural diagram of an existing normally closed brake, in which the electric driving device 2' includes a push rod device 4', a motor 5' and a reduction mechanism 6'; the rotating shafts in the transmission system of the electric driving device 2' include a motor shaft 5a', an input shaft 6a' and an output shaft 6b' of the reduction mechanism 6', and a threaded rotating shaft 4a' of the push rod device 4'; when the motor 5' is energized and operates, the motor shaft 5a' drives the input shaft, output shaft and threaded rotating shaft of the reduction mechanism 6' to rotate forward; a normally open clutch 2a' is provided at the outer end of the input shaft 6a' of the reduction mechanism, and its function is to be energized and closed when the braking mechanism 1' is in the open state to lock the input shaft of the reduction mechanism in a non-rotatable state, so as to maintain the braking mechanism 1' in the open state;

[0003] The push rod device 4' includes a housing 4e', the inner end of the housing 4e' is connected to the inner side wall of the housing of the reduction mechanism 6', the threaded section 4b' of the threaded rotating shaft 4a' is located in the inner cavity of the housing 4e', a nut 4c' is provided on the threaded section 4b', the nut 4c' and the threaded section 4b' form a screw transmission pair, a flange 4d' is provided in the middle of the nut 4c', the outer end of the flange 4d' is a push rod 8', the outer section of the push rod 8' extends beyond the end wall of the housing 4e', a spring member 7' is provided between the flange 4d' and the inner side wall of the housing of the reduction mechanism 6', the tension of the spring member 7' acts on the push rod 8' through the flange 4d', and connecting ears 8a' located on the same axis are provided at the end of the push rod 8' and on the outer side wall of the housing of the reduction mechanism 6', Figure 1 As shown, the connecting ear 8a' is hinged to the driving end 3c' of the brake arm 3' in the braking mechanism 1'.

[0004] The working process of the electric driving device 2' driving the normally closed brake is as follows: when the motor 5' is energized and operates, the threaded rotating shaft 4a' is driven to rotate by the output shaft 6b' of the reduction mechanism 6', the nut 4c' displaces inward along the threaded section 4b', the spring member 7' is compressed, at the same time, the nut 4c' and the push rod 8' retract inward, and the connecting ears 8a' at both ends of the push rod device drive the driving ends 3c' of the two brake arms 3' to swing inward, and the braking members 3b' at the braking ends 3a' of the two brake arms 3' open outward until released Figure 1In the braking state shown, the clutch 2a' is energized and closed to lock the input shaft of the reduction mechanism in a state that cannot rotate, so as to maintain the braking mechanism in an open state, and the motor is powered off and stops running; when braking is required, the clutch 2a' is powered off and reset to the open state to release the lock on the input shaft of the reduction mechanism, and the motor shaft in the shaft system, the input shaft and output shaft of the reduction mechanism 6', and the threaded shaft of the push rod device 4' are all in a rotatable state. In this state, under the thrust of the spring member 7', the threaded shaft 4a', the gear shaft of the reduction mechanism and the motor shaft are reversed, and the nut 4c' is displaced toward the outer end along the threaded section 4b', and the push rod 8' is extended outward accordingly. The push rod device 4' pushes the driving ends 3c' of the two brake arms 3' to swing outward through the connecting ears 8a' at both ends, and the brake components 3b' of the brake ends 3a' of the two brake arms 3' are closed inward until they are in a Figure 1 Braking status shown.

[0005] Taking the normally closed brake as an example, the electric propulsion device 2' has the following deficiencies:

[0006] In the process of the electric propulsion device 2' driving the normally closed brake to achieve braking:

[0007] 1) As the friction plate in the brake mechanism and the braking surface of the braked part are frequently engaged and worn, the gap between the friction plate and the braking surface of the braked part increases or becomes too large. Therefore, the extension stroke of the spring member 7' of the electric propulsion device 2' becomes larger, and the thrust of the spring member 7' when extended decreases, which affects the braking effect, resulting in reduced braking reliability and working stability. In particular, when the spring member 7' is a spring member with high stiffness, a slight wear of the friction plate will cause the braking force to drop rapidly, seriously affecting the reliability of the braking effect and even causing safety hazards.

[0008] 2) In the electric push device 2', due to the thrust of its spring member 7', the nut 4c' is pushed to move rapidly outward along the threaded section 4b', and the push rod device 4' pushes the driving ends 3c' of the two brake arms 3' to swing rapidly outward through the connecting ears 8a' at both ends, and the brake components 3b' at the brake ends of the two brake arms 3' are rapidly closed inward, and the friction plate 3d' on the brake block is rapidly engaged with the braked component. The kinetic energy generated by the rotation of the rotating component causes an impact on the braked component, causing the brake and the equipment to vibrate, affecting the stability of the braking process, and even causing component damage. Summary of the invention:

[0009] In view of the deficiencies of the prior art, the object of the present invention is to propose an electric push rod with superimposed thrust, which is provided with a two-stage spring force source member to achieve a first thrust on the pushed member by the first spring member and then achieve a superimposed thrust again, and the thrust of the second spring member on the first spring member plays a buffering role in the impact generated when acting on the pushed member, which can improve the reliability of the operation effect and the stability of the operation process.

[0010] The technical solution of the present invention:

[0011] For the convenience of reading and understanding, the technical solution of the present invention will be described with the aid of the attached drawings.

[0012] The solution of the present invention is shown in Figure 2 、 Figure 5 、 Figure 6 、 Figure 9 ;

[0013] The solution of the present invention includes a push rod device 4, a motor 5 and a one-way control mechanism 9 for controlling the pushing operation condition;

[0014] The one-way control mechanism 9 includes a second housing 17, a connecting shaft 9a and a connecting rotating shaft 9b located in the housing, and a clutch mechanism 11 is provided;

[0015] The rotating shafts in the transmission system of the solution of the present invention include a motor shaft 5a, a threaded rotating shaft 4a in the push rod device 4, the connecting shaft 9a and the connecting rotating shaft 9b in the one-way control mechanism 9; one end of the connecting rotating shaft 9b is connected to the motor shaft 5a, the other end of the connecting rotating shaft 9b is connected to one end of the clutch mechanism 11, the other end of the clutch mechanism 11 is connected to one end of the connecting shaft 9a, and the other end of the connecting shaft 9a is connected to the inner end of the threaded rotating shaft 4a; when the motor 5 operates, the motor shaft 5a can drive the connecting rotating shaft 9b, the connecting shaft 9a and the threaded rotating shaft 4a to rotate forward (in this specification, the rotation of the motor shaft 5a driving the connecting rotating shaft 9b, the connecting shaft 9a and the threaded rotating shaft 4a is called forward rotation), and in the operation condition, when the threaded rotating shaft 4a rotates reversely, the connecting shaft 9a rotates reversely accordingly;

[0016] A normally closed one-way braking mechanism 10 is provided on the connecting shaft 9a. The "one-way braking mechanism" refers to a braking mechanism that has a braking function only in one movement direction. The function of the normally closed one-way braking mechanism 10 is: when powered off and closed, it locks the connecting shaft 9a, the connecting rotating shaft 9b, the threaded rotating shaft 4a and the motor shaft 5a from rotating forward to effectively maintain the electric push rod in a thrust state;

[0017] A one-way bearing 20 is provided on the connecting rotating shaft 9b. The function of the one-way bearing 20 is as follows: when the clutch mechanism 11 is energized and closed to make the connecting shaft 9a and the connecting rotating shaft 9b in a coupled state, the one-way bearing 20 controls the connecting shaft 9a, the connecting rotating shaft 9b, the threaded rotating shaft 4a and the motor shaft 5a to rotate only in the forward direction and not in the reverse direction, so as to effectively maintain the electric push rod in the reset state. When the clutch mechanism 11 is de-energized and opened to make the connecting shaft 9a and the connecting rotating shaft 9b in a disengaged state, the connecting rotating shaft 9b and the motor shaft 5a are locked and do not rotate in reverse with the threaded rotating shaft 4a;

[0018] The push rod device 4 has a connecting plate 12 and a first housing 13. The inner end of the first housing 13 is connected to the connecting plate 12. One end of the threaded rotating shaft 4a is connected to the connecting plate 12 and supported by the connecting plate 12. The threaded section 4b at the other end of the threaded rotating shaft 4a is located inside the first housing 13. A nut 14 is provided on the threaded section 4b. The threaded section 4b and the nut 14 form a screw transmission pair, and the thread angle is greater than the self-locking angle. A flange 14a is provided on the nut 14. When the threaded rotating shaft 4a rotates, the nut 14 can axially displace along the threaded section 4b, and the flange 14a on the nut 14 displaces accordingly;

[0019] The outer end of the first housing 13 is provided with a sleeve-type push rod 8 with an end wall 8b. The inner end of the sleeve-type push rod 8 is provided with a disc member 15. The disc member 15 is connected and fixed to the inner end of the sleeve-type push rod 8. The disc member 15 has an inner hole 15a. The wall surface of the sleeve-type push rod 8 is matched with the hole on the end wall 13a of the first housing 13. The outer end of the sleeve-type push rod 8 extends outside the end wall 13a of the first housing 13. The flange 14a on the nut 14 is located in the lumen of the sleeve-type push rod 8. The diameter of the inner hole 15a on the disc member 15 is larger than the outer diameter of the nut 14. Under the action of an external force, the sleeve-type push rod 8 can axially extend or retract relative to the first housing 13;

[0020] A first spring member 7 is provided inside the first housing 13. The first spring member 7 is located between the disc member 15 at the inner end of the sleeve-type push rod 8 and the connecting plate 12. See Figure 2 、 Figures 5 to 8 , or the first spring member 7 is located between the disc member 15 at the inner end of the sleeve-type push rod 8 and the end wall 13a of the first housing 13. See Figure 9 , and the thrust of the first spring member 7 acts on the sleeve-type push rod 8;

[0021] A second spring member 16 is provided in the push rod device 4. The second spring member 16 is located between the flange 14a on the nut 14 and the end wall 8b of the sleeve-type push rod 8. See Figure 2 、 Figures 5 to 8 , or the second spring member 16 is located between the flange 14a on the nut 14 and the disc member 15 at the inner end of the sleeve-type push rod 8. SeeFigure 9 The thrust of the second spring member 16 acts on the sleeve push rod 8; the first spring member 7 and the second spring member 16 constitute the force source members of the double-stage thrust of the present invention;

[0022] The outer ends of the sleeve push rod 8 and the other end member coaxial with the sleeve push rod 8 are respectively provided with connecting ears 8a on the same axis, that is, the connecting ears 8a at both ends of the present invention. See Figure 2 、 Figures 5 to 9 。 Figure 2 As shown, it is an example of the present invention applied to a normally closed brake. The connecting ears 8a at both ends of the present invention are respectively hinge-connected to the driving ends 3c of the two brake arms 3 of the braking mechanism.

[0023] Furthermore:

[0024] The connecting shaft 9a in the one-way control mechanism 9 can be of an integral structure. See Figure 2 、 Figure 5 、 Figure 6 、 Figure 9 ; The connecting shaft 9a can also be of a split structure of a first segmented body 9a01 and a second segmented body 9a02. See Figure 7 、 Figure 8 When the connecting shaft 9a is of a segmented body structure, one end of one of the segmented bodies is connected to one end of the connecting rotating shaft 9b through the clutch mechanism 11;

[0025] The second housing 17 in the one-way control mechanism 9 can be of an integral structure, corresponding to the integral structure of the connecting shaft 9a. See Figure 2 、 Figure 5 、 Figure 6 、 Figure 9 ; The second housing 17 can also be of a split housing structure of a first split housing 1701 and a second split housing 1702, corresponding to the split structure of the first segmented body 9a01 and the second segmented body 9a02 of the connecting shaft 9a. See Figure 7 、 Figure 8 。

[0026] The working state or process of the present invention will be described below by taking Figure 2 as an example.

[0027] Figure 2 In the figure, the first spring member 7 is located between the disc member 15 at the inner end of the sleeve push rod 8 and the connecting plate 12, and the second spring member 16 is located between the flange 14a on the nut 14 and the end wall 8b of the sleeve push rod 8.

[0028] 1) The working state of the present invention during the braking release process of a normally closed brake:

[0029] Figure 2In the shown braking state, the first spring member 7 is in the first thrust state after being extended after the first-stage braking, and the second spring member 16 is in the superimposed thrust state in the superimposed braking state where it is further compressed and stores energy. In this state, the normally-closed one-way braking mechanism 10 is in the closed state and locks the connecting shaft 9a from rotating forward, maintaining the second spring member 16 in a stable and reliable superimposed thrust state. The sleeve-type push rod 8 is in the state of protruding outward. There is a spacing as shown in Figure 2 between the inner side surface of the flange 14a on the nut 14 and the inner side surface of the disc member 15 at the inner end of the sleeve-type push rod 8, and between the outer end of the threaded section 4b and the inner side surface of the end wall 8b of the sleeve-type push rod 8.

[0030] When the brake needs to be released, that is, the thrust state of the electric push rod is released, the normally closed one-way brake mechanism 10 is powered on and opened, and the positive locking state of the connecting shaft 9a is released. The clutch mechanism 11 is powered on and closed at the same time, so that the connecting shaft 9a and the connecting shaft 9b are in a coupling state. At this time, the connecting shaft 9a is in a state where it can rotate forward. In this state, the compressed second spring member 16 releases energy and extended thrust when the threaded shaft 4a can rotate forward, and drives the nut 14 to move toward the inner end along the threaded section 4b through the flange 14a on the nut 14, so that the threaded shaft 4a produces positive rotation, and the motor 5 is powered on, and the motor shaft 5a drives the connecting shaft 9b. , the connecting shaft 9a, and the threaded shaft 4a rotate forwardly, that is, the second spring component 16 releases energy and the thrust of extension assists the motor shaft 5a to drive the threaded shaft 4a to rotate forwardly, and the combined force of the two enables the threaded shaft 4a to rotate forwardly quickly, thereby accelerating the displacement of the nut 14 along the threaded section 4b toward the inner end, until the inner side surface of the flange 14a on the nut 14 is attached to and pressed against the inner side surface of the disk 15 at the inner end of the sleeve-type push rod 8, at this point, the extension stroke of the second spring component 16 is completed, the thrust of the extension trend of the second spring component 16 on the sleeve-type push rod 8 is eliminated, and the superimposed thrust is released, that is, the superimposed brake is released; in the process of releasing the superimposed thrust, the The thrust of the second spring member 16 released and stretched helps the motor shaft 5a drive the threaded shaft 4a to rotate forward, which is beneficial to shorten the time of releasing the thrust and help the motor start, and can reduce the energy consumption of the motor; as the motor shaft 5a continues to drive the connecting shaft 9b, the connecting shaft 9a, and the threaded shaft 4a to rotate forward, the nut 14 continues to move inward along the threaded section 4b, and the flange 14a on the nut 14 drives the sleeve-type push rod 8 to retract inward. The connecting ears 8a at both ends of the present invention pull the driving ends 3c of the two brake arms to swing inward, and the end points of the braking ends 3a of the two brake arms move outward accordingly, until the friction plate 3d is driven to contact with the braked The movable part is disengaged to a certain gap, and the first spring component 7 is compressed accordingly, and the first thrust is released, that is, the first brake is released. In this state, the motor 5 is powered off and stops running, and the one-way bearing 20 is locked to prevent the connecting shaft 9b from rotating in the reverse direction, and the connecting shaft 9a, the threaded shaft 4a and the motor shaft 5a are unable to rotate in the reverse direction. The first spring component 7 is in a stable compressed state, thereby effectively maintaining the electric push rod in a stable reset state, that is, the brake is in a stable open state (i.e., the brake is released). In this state, the inner side surface of the flange 14a on the nut 14 and the inner side surface of the disk 15 at the inner end of the sleeve-type push rod 8 are in a fitted and pressed state.

[0031] 2) The working state of the present invention during the braking process of the normally closed brake:

[0032] When braking is required, that is, the electric push rod realizes the thrust state, the clutch mechanism 11 is powered off and reset to the separated state, and the coupling state of the connecting shaft 9a and the connecting rotating shaft 9b is released, that is, the locking of the connecting shaft 9a is released, so that the connecting shaft 9a is in a reversible state, and the normally closed one-way brake mechanism 10 is in the power-off closed state and does not affect the reversal of the connecting shaft 9a. In this state, the first spring member 7 in the compressed state is stretched, and the disc member 15 acting on the inner end of the sleeve-type push rod 8 pushes the sleeve-type push rod 8 to extend outward. When the sleeve-type push rod 8 extends outward, the sleeve-type push rod 8 At the same time, since the inner side surface of the flange 14a on the nut 14 and the inner side surface of the disk 15 at the inner end of the sleeve-type push rod 8 are in a state of being in close contact and compression, the disk 15 at the inner end of the sleeve-type push rod 8 pushes the flange 14a of the nut 14 to move outward, and the nut 14 moves outward along the threaded section 4b accordingly. In the process of the nut 14 moving outward, the threaded shaft 4a is driven to enter a reverse state, and the connecting shaft 9a is in a reverse state accordingly; under the thrust of the first spring member 7 which continues to extend, as the sleeve-type push rod 8 continues to extend outward, that is, it enters the first push state. In the dynamic state, the connecting ears 8a at both ends of the present invention respectively drive the driving ends 3c of the two brake arms to swing outward, and the brake components 3b at the braking ends of the two brake arms are quickly closed inward until the friction plate 3d and the braking surface of the braked part are quickly attached and pressed, thereby realizing the first thrust. In the process of the friction plate 3d and the braking surface of the braked part being quickly attached to and pressed, the sleeve-type push rod 8 stops extending outward. Due to the thrust of the continued extension of the first spring component 7 and the kinetic energy generated by the rotating component during the rotation process, the threaded shaft 4a continues to reverse, and the nut 14 continues to rotate. When the threaded section 4b continues to move toward the outer end, the flange 14a on the nut 14 is disengaged from the disk 15 at the inner end of the sleeve push rod 8, and the flange 14a begins to compress the second spring member 16. After the flange 14a is disengaged from the disk 15 at the inner end of the sleeve push rod 8, the thrust of the first spring member 7 with the continuous extension trend acts on the sleeve push rod 8, and pushes the driving end 3c of the brake arm to swing outward through the connecting ear 8a, so that the friction plate 3d and the braking surface of the braked member are quickly attached and pressed to enter the first-stage braking, until the first-stage braking is achieved;

[0033] In the state where the first spring member 7 realizes the first thrust, that is, the state of realizing the primary effective braking, or during the process where the first spring member 7 performs the first push, that is, performs the primary braking, by the action of the extended thrust, when the braking gap becomes larger due to the wear of the friction plate, the first spring member 7 will continue to extend a certain stroke. Although the stroke of the continuous extension of the first spring member 7 will affect the first thrust effect to a certain extent, the stroke of the continuous extension of the first spring member 7, first, enables the relevant rotating members to continue to form kinetic energy, and second, compensates for the enlarged braking gap, so that the friction plate and the piece to be braked still remain in a state of being tightly pressed together; in this state, due to the kinetic energy formed by the rotation of the threaded rotating shaft 4a and the connecting shaft 9a in the reverse rotation state, the threaded rotating shaft 4a continues to rotate in reverse, and the nut 14 continues to move outward along the threaded section 4b. As the nut 14 continues to move further outward along the threaded section 4b, the second spring member 16 is further compressed, and the distance between the flange 14a on the nut 14 and the disk member 15 at the inner end of the sleeve-type push rod 8 after being disengaged increases accordingly, until when the threaded rotating shaft 4a stops rotating in the reverse direction and the nut 14 stops moving outward, the inner side surface of the flange 14a on the nut 14 is disengaged from the disk member 15 at the inner end of the sleeve-type push rod 8 to be as shown in Figure 2At the shown spacing, the second spring member 16 is in a state of being further compressed and storing energy, thereby achieving a superimposed thrust. When the threaded rotating shaft 4a stops reverse rotation, the normally closed one-way braking mechanism 10 in the closed state locks the connecting shaft 9a from rotating forward (the threaded rotating shaft 4a and the connecting shaft 9a also cannot rotate forward), keeping the second spring member 16 in a stable state of being further compressed and storing energy, thus effectively maintaining the stable thrust state of the electric push rod with a reliable pushing effect. In this state, the thrust of the stretching tendency generated by the second spring member 16 after being further compressed and storing energy acts on the sleeve-type push rod 8, causing the sleeve-type push rod 8 to continue to have a tendency to extend outward, thereby further pushing the driving ends 3c of the two braking arms to swing outward. That is, on the basis of the primary braking, the braking members 3b at the braking ends 3a of the two braking arms obtain a braking power source again and further close inward, enabling the friction plates to obtain a superimposed braking force to achieve superimposed braking on the piece to be braked, and the normally closed one-way braking mechanism 10 in the closed state locks the connecting shaft 9a from rotating forward, thus effectively maintaining the stable state of the brake with a reliable braking effect; the superimposed thrust achieved by the second spring member 16 in the state of being further compressed and storing energy is, firstly, to obtain a superimposed thrust on the basis of the first thrust (i.e., the state of achieving primary effective braking) under the thrust of the first spring member 7, thereby improving the reliability of the pushing effect (i.e., the braking effect); secondly, when the braking gap becomes larger due to wear of the friction plates, the friction plates and the piece to be braked are in a state of being tightly pressed together to obtain the superimposed thrust achieved by the second spring member 16. Moreover, although the increased braking gap will to a certain extent affect the effect of the first thrust when the first spring member 7 continues to stretch, the thrust of the first spring member 7 during the continued stretching stroke enables the relevant rotating members to continue to form kinetic energy, and the continuously formed kinetic energy can increase the effect of further compression and energy storage of the second spring member 16 (i.e., increase the effect of the superimposed thrust achieved by the second spring member 16), enabling the normally closed brake applied in the present invention to still be in a stable and reliable braking state; compared with the prior art, the reliability of the braking effect is improved.

[0034] Technical effects of the present invention:

[0035] 1. Since the first spring member 7 and the second spring member 16 are simultaneously provided in the present invention, when applied to a brake, during the braking process of the braking mechanism, after the first push is implemented by the thrust action when the first spring member 7 expands to achieve primary braking, due to the kinetic energy formed by the relevant rotating members during the first push, that is, during primary braking, the second spring member 16 is further compressed and stores energy. The thrust of the expansion trend generated by the second spring member 16 after being further compressed and storing energy is used to achieve superimposed thrust, that is, superimposed braking, and the normally closed one-way braking mechanism 10 in the closed state effectively maintains the stable thrust state of the electric push rod with a reliable pushing effect, that is, the brake is in a stable state with a reliable braking effect; the reliable braking effect of the braking mechanism is in a stable state. Compared with the prior art, the reliability of the braking effect is improved; similarly, when the present invention is used in other equipment or devices with similar operating conditions of the brake, it has a similar effect, enabling the object to be pushed to be in a stable state; moreover, the superimposed thrust obtained by further compressing and storing energy in the second spring member 16 is achieved by making full use of the kinetic energy formed by the reverse rotation of the relevant rotating members during the first push implementation process, without consuming energy.

[0036] 2. When the present invention is applied to a normally closed brake, during the first push of the first spring member 7, i.e., during the primary braking of the braking mechanism, when the brake clearance becomes larger due to wear of the friction plate, the first spring member 7 will continue to extend a certain stroke. Although the continued extension stroke of the first spring member 7 will affect the first thrust effect to a certain extent, the thrust generated by the continued extension stroke of the first spring member 7 enables the relevant rotating members to continue to form kinetic energy, while compensating for the increased brake clearance, so that the friction plate and the member to be braked still remain in a state of being in contact and pressed tightly to achieve primary braking; after the primary braking is achieved, due to the kinetic energy formed by the relevant rotating members during the primary braking, the second spring member 16 is further compressed and stores energy, and the thrust generated by the extension tendency of the second spring member 16 after being further compressed and storing energy realizes the superimposed thrust; moreover, although the increased brake clearance causes the continued extension stroke of the first spring member 7 to affect the first thrust effect to a certain extent, the continued extension stroke of the first spring member 7 enables the relevant rotating members to continue to form kinetic energy, and the continuously formed kinetic energy can increase the further compression and energy storage of the second spring member 16 to increase the superimposed thrust of the second spring member 16, so as to improve the effect of the superimposed braking, so that the normally closed brake applied with the present invention can still achieve stable and reliable braking when the brake clearance becomes larger due to wear of the friction plate; compared with the prior art, the reliability of the braking effect is improved, and the defect that the prior art needs to frequently adjust the brake clearance is overcome. Similarly, when the present invention is used in other equipment or devices with similar brake operating conditions, the same effect is achieved, enabling the object to be pushed to be in a stable and reliable state.

[0037] 3. When the present invention is applied to a normally closed brake, in the braking state after the superimposed thrust is achieved, i.e., after the braking mechanism achieves superimposed braking, when the friction plate becomes thinner due to wear and shows a tendency of loosening from the braking surface of the member to be braked, since in this state, there is a certain distance between the inner side surface of the flange 14a on the nut 14 and the inner side surface of the disc member 15 at the inner end of the sleeve-type push rod 8 or between the outer side surface of the flange 14a on the nut 14 and the inner side surface of the end wall 8b of the sleeve-type push rod 8, the first spring member 7 and the second spring member 16 in the compressed state can quickly generate the thrust of the continued extension tendency, and by acting on the sleeve-type push rod 8, the sleeve-type push rod 8 is pushed to extend outward or retract inward, which can perform a certain clearance compensation for the tendency of loosening between the friction plate and the braking surface of the member to be braked, so that the friction plate 3d and the braking surface of the member to be braked maintain an effective braking state of being in contact and pressed tightly, so that the braking mechanism can still maintain an effective braking state when the friction plate wears during the braking state after the superimposed braking is achieved. Similarly, when the present invention is used in other equipment or devices with similar brake operating conditions, the same effect is achieved, enabling the object to be pushed to be in an effective pushing state.

[0038] 4. When the present invention is applied to a brake, when the first spring member 7 performs the first push, that is, when the braking mechanism performs the first-stage braking, during the process of realizing the first thrust, that is, the friction plate 3d quickly fits and presses against the braking surface of the member to be braked and enters the first-stage braking, when the flange 14a is disengaged from the disc member 15 at the inner end of the sleeve-type push rod 8 or the flange 14a is disengaged from the end wall 8b of the sleeve-type push rod 8, the second spring member 16 is compressed and the generated stretching thrust acts on the flange 14a on the nut 14 and the disc member 15 at the inner end of the sleeve-type push rod 8 or the end wall 8b of the sleeve-type push rod 8 that is still in contact with the flange 14a, so that the stretching force generated by the compression of the second spring member 16 buffers the force that continues the stretching trend of the first spring member 7 acting on the disc member 15, that is, buffers the impact generated when the friction plate 3d quickly combines and presses against the braking surface of the member to be braked, can reduce the impact on the member to be braked, reduce the vibration generated by the present brake and the device to be braked, avoid damage to the components, and thus improve the stability of the braking operation process. Similarly, when the present invention is used in other devices or apparatuses with similar brake operating conditions, the same effect is achieved. The thrust of the second spring member on the first spring member buffers the impact generated when acting on the pushed member, can reduce the impact on the pushed member, reduce the vibration, and avoid damage to the components.

[0039] 5. During the process of releasing the thrust of the present invention, the normally-closed one-way braking mechanism 10 is energized to release the positive locking of the connecting shaft 9a, and the clutch mechanism 11 is simultaneously energized to close so that the connecting shaft 9a and the connecting rotating shaft 9b are in a coupled state. Since the second spring member 16 that is in a compressed state and stores energy starts to release energy and the stretching thrust acts on the flange 14a on the nut 14, the nut 14 starts to displace inward or outward along the threaded section 4b, thereby driving the threaded rotating shaft to rotate positively. After the motor 5 is energized, the motor shaft 5a also drives the connecting rotating shaft 9b, the connecting shaft 9a, and the threaded rotating shaft 4a to rotate positively. That is, during the process of releasing the superimposed thrust, the energy released and the stretching thrust of the second spring member 16 act to assist the motor shaft 5a to drive the threaded rotating shaft 4a to rotate positively. The combined force of the two can make the threaded rotating shaft 4a rotate quickly and positively, accelerate the displacement of the nut 14 inward or outward along the threaded section 4b, is beneficial to shortening the time of releasing the thrust and assisting the start of the motor, and can reduce the energy consumption of the motor.

[0040] Other technical effects will be further described in the specific implementation manner. Description of the Drawings:

[0041] Figure 1 It is a structural schematic diagram of an existing normally-closed brake, including the structure of the electric pushing device 2'.

[0042] Figure 2It is a schematic structural diagram of Embodiment 1 of the present invention and shows a connection mode with the braking mechanism 1;

[0043] Figure 3 It is Figure 2 a schematic cross-sectional structure of the A-A section of the push rod device 4 in

[0044] Figure 4 It is another implementation structure relative to Figure 3 the cross-sectional structure;

[0045] Figure 5 It is a schematic structural diagram of Embodiment 2;

[0046] Figure 6 It is a schematic structural diagram of Embodiment 3;

[0047] Figure 7 It is a schematic structural diagram of Embodiment 4;

[0048] Figure 8 It is a schematic structural diagram of Embodiment 5;

[0049] Figure 9 It is a schematic structural diagram of Embodiment 6, showing a deformation structure of the solution of the present invention;

[0050] Figure 10 The shown is a connection mode of the present invention with the braking mechanism 1 in another structural form.

[0051] Figures 5 to 9 The cross-sectional schematic structure of the push rod device 4 in Figure 3 and Figure 4 refers to the shown structure. Specific implementation manner:

[0052] Embodiment 1, refer to Figures 2 - 4 .

[0053] Figure 2 The shown is the structure of Embodiment 1 of the present invention and shows an example applied to a normally closed brake.

[0054] The present invention includes a push rod device 4, a motor 5, and a one-way control mechanism 9 for controlling the pushing operation condition;

[0055] The one-way control mechanism 9 includes a second housing 17 and a connecting shaft 9a and a connecting rotating shaft 9b located in the housing, and is provided with a clutch mechanism 11 and a one-way bearing 20;

[0056] The rotating shaft in the transmission system of this embodiment includes the motor shaft 5a, the threaded rotating shaft 4a in the push rod device 4, the connecting shaft 9a and the connecting rotating shaft 9b in the one-way control mechanism 9; one end of the connecting rotating shaft 9b is connected to the motor shaft 5a, the other end of the connecting rotating shaft 9b is connected to one end of the clutch mechanism 11, the other end of the clutch mechanism 11 is connected to one end of the connecting shaft 9a, and the other end of the connecting shaft 9a is connected to the inner end of the threaded rotating shaft 4a; when the motor 5 operates, the motor shaft 5a can drive the connecting rotating shaft 9b, the connecting shaft 9a, and the threaded rotating shaft 4a to rotate forward (in this specification, the rotation of the motor shaft 5a driving the connecting rotating shaft 9b, the connecting shaft 9a, and the threaded rotating shaft 4a is called forward rotation). During the operating condition, when the threaded rotating shaft 4a rotates reversely, the connecting shaft 9a rotates reversely accordingly;

[0057] In this example, one end of the connecting rotating shaft 9b and the motor shaft 5a have a coupling connection structure, and the other end of the connecting shaft 9a and the inner end of the threaded rotating shaft 4a also have a coupling connection structure.

[0058] A normally closed one-way braking mechanism 10 is provided on the connecting shaft 9a. The "one-way braking mechanism" refers to a braking mechanism that has a braking function only in one movement direction. The function of the normally closed one-way braking mechanism 10 is: when powered off and closed, it locks the connecting shaft 9a, the connecting rotating shaft 9b, the threaded rotating shaft 4a, and the motor shaft 5a from rotating forward, so as to effectively maintain the electric push rod in the thrust state;

[0059] A one-way bearing 20 is provided on the connecting rotating shaft 9b. The "one-way bearing" controls the connecting rotating shaft 9b to rotate only in one direction. The function of the one-way bearing 20 is to control the connecting rotating shaft 9b to rotate only forward and not backward. During the operation of the working condition, that is, when the clutch mechanism 11 is powered on and closed to make the connecting shaft 9a and the connecting rotating shaft 9b in a coupled state, the one-way bearing 20 locks the connecting shaft 9a, the connecting rotating shaft 9b, the threaded rotating shaft 4a, and the motor shaft 5a from rotating reversely, so as to effectively maintain the electric push rod in the reset state;

[0060] In specific implementation, the one-way bearing 20 is supported by the support member 20a on the inner wall of the second housing 17, or supported by other adjacent components; Figure 2 As shown, the one-way bearing 20 is supported by the support member 20a on the inner wall of the second housing 17;

[0061] The push rod device 4 has a connecting plate 12 and a first housing 13. The inner end of the first housing 13 is connected to the connecting plate 12. One end of the threaded rotating shaft 4a is connected to the connecting plate 12, and the connection part between the two is in bearing contact and forms a support for the threaded rotating shaft 4a. The threaded section 4b on the threaded rotating shaft 4a is located inside the cavity of the first housing 13. A nut 14 is provided on the threaded section 4b, and the threaded section 4b and the nut 14 form a threaded transmission pair. The thread angle is greater than the self-locking angle. A flange 14a is provided on the nut 14. When the threaded rotating shaft 4a rotates, the nut 14 can axially displace along the threaded section 4b, and the flange 14a on the nut 14 displaces accordingly;

[0062] The outer end of the first housing 13 is provided with a sleeve-type push rod 8 with an end wall 8b. The inner end of the sleeve-type push rod 8 is provided with a disc member 15. The disc member 15 is connected and fixed to the inner end of the sleeve-type push rod 8. The disc member 15 has an inner hole 15a. The tube wall surface of the sleeve-type push rod 8 is matched with the hole on the end wall 13a of the first housing 13, and the two are in bearing contact. The outer end of the sleeve-type push rod 8 extends beyond the end wall of the first housing 13. The flange 14a on the nut 14 is located inside the tube cavity of the sleeve-type push rod 8. The diameter of the inner hole 15a on the disc member 15 is larger than the outer diameter of the nut 14. Under the action of an external force, the sleeve-type push rod 8 can axially extend or retract relative to the first housing 13;

[0063] In implementation, the flange 14a is preferably integrally formed with the nut 14. A first keyway matching structure 18 composed of a sliding key and a sliding groove is provided on the outer wall surface of the nut 14 and the inner hole 15a of the disc member 15; Figure 2 、 Figure 3 As shown, a sliding key 14b is provided on the outer wall surface of the nut 14, and a sliding groove 15b is provided on the inner hole 15a of the disc member 15. The sliding key 14b is located inside the sliding groove 15b to form the first keyway matching structure 18. In implementation, the sliding key 14b can also be provided on the inner hole 15a of the disc member 15, and the sliding groove 15b is then provided on the outer wall surface of the nut 14. Under the action of an external force, the sliding key 14b can displace along the sliding groove 15b. Due to the guiding and limiting action of the sliding groove 15b on the sliding key 14b, the nut 14 can only axially displace along the threaded section 4b;

[0064] In addition, a second keyway matching structure 19 composed of a groove and a key is provided on the outer edge of the disc member 15 at the inner end of the sleeve-type push rod 8 and the inner wall surface of the first housing 13; Figure 2 、 Figure 3As shown, a groove 15c is provided on the outer edge of the disc member 15, and a key 13b is provided on the inner wall surface of the first housing 13. The key 13b is located within the groove 15c to form the second keyway mating structure 19. In practice, the key 13b can also be provided on the outer edge of the disc member 15, and the groove 15c is then provided on the inner wall surface of the first housing 13. Under the action of an external force, the groove 15c can displace along the key 13b. The guiding and limiting action of the key 13b on the groove 15c causes the telescopic push rod 8 to only generate an axial displacement relative to the first housing 13;

[0065] A first spring member 7 is provided within the first housing 13. The first spring member 7 is located between the disc member 15 at the inner end of the telescopic push rod 8 and the connecting plate 12, or the first spring member 7 is located between the disc member 15 at the inner end of the telescopic push rod 8 and the end wall 13a of the first housing 13. The thrust of the first spring member 7 acts on the telescopic push rod 8; as Figure 2 shown in Embodiment 1, the first spring member 7 is located between the disc member 15 at the inner end of the telescopic push rod 8 and the connecting plate 12. The thrust of the first spring member 7 acts on the telescopic push rod 8 through the disc member 15 that is integrally connected to the telescopic push rod 8. In practice, the first spring member 7 can be in a structural form of several pieces evenly distributed along the circumference, Figure 3 as shown, there are 6 first spring members 7 evenly distributed along the circumference; the first spring member 7 can also be Figure 4 the single coil spring member shown in, or a coil structure formed by several disc springs;

[0066] A second spring member 16 is provided in the push rod device 4. The second spring member 16 is located between the flange 14a on the nut 14 and the end wall 8b of the telescopic push rod 8, or the second spring member 16 is located between the flange 14a on the nut 14 and the disc member 15 at the inner end of the telescopic push rod 8. The thrust of the second spring member 16 acts on the telescopic push rod 8; as Figure 2 shown in Embodiment 1, the second spring member 16 is located between the flange 14a on the nut 14 and the end wall 8b of the telescopic push rod 8. The tension of the second spring member 16 acts on the telescopic push rod 8 through the end wall 8b of the telescopic push rod 8. In practice, the second spring member 16 located within the inner cavity of the telescopic push rod 8 can be in a structural form similar to Figure 3 that shown by several second spring members 16 evenly distributed along the circumference, or can be in a structural form similar to Figure 4 the single coil spring shown, etc.;

[0067] The first spring member 7 and the second spring member 16 are the force source members for the double-stage thrust of the present invention;

[0068] Figure 2As shown, the connecting shaft 9a has an integral structure, and the second housing 17 correspondingly has an integral structure. One end of the second housing 17 is connected to the front end of the housing of the motor 5, and the other end is connected to the connecting plate 12. The connecting shaft 9a, the normally closed one-way braking mechanism 10 provided on this connecting shaft, the connecting rotating shaft 9b and the clutch mechanism 11, as well as the one-way bearing 20 provided on the connecting rotating shaft 9b are all located inside the second housing 17. In a specific implementation, a wall plate 17b can be provided in the second housing 17 for auxiliary support of the connecting shaft 9a.

[0069] The outer shape is in a "one" shape. Connecting ears 8a on the same axis are respectively provided at the outer end of the sleeve-type push rod 8 and the outer end of the other component coaxial with the sleeve-type push rod 8. Figure 2 In the shown Embodiment 1, the other component coaxial with the sleeve-type push rod 8 is the motor 5, that is, connecting ears 8a on the same axis are respectively provided at the outer end of the sleeve-type push rod 8 and the rear end of the housing of the motor 5 coaxial with the sleeve-type push rod 8 (i.e., the outer end), that is, the connecting ears 8a at both ends of the present invention. Figure 2 As shown, it is a schematic structural diagram of the normally closed brake formed by the present invention and the braking mechanism 1. The connecting ear 8a is used for hinge connection with the driving end 3c of the braking arm 3 in the braking mechanism.

[0070] The normally closed one-way braking mechanism 10 and the clutch mechanism 11 are off-the-shelf existing products with electromagnetic structures. In this embodiment, the normally closed one-way braking mechanism 10 is fixed on the plate 17a in the second housing 17, and the positioning screw 10a of the normally closed one-way braking mechanism 10 is connected to the plate 17a; there is a bushing with a sliding key fit in the central hole of the brake disc of the normally closed one-way braking mechanism 10, and there is a one-way bearing in the central hole of the bushing. The bushing is supported and fixed on the connecting shaft 9a through the one-way bearing. The brake disc can move axially along the bushing through the sliding key fit with the bushing. The connecting shaft 9a can only rotate reversely relative to the brake disc; when the normally closed one-way braking mechanism 10 is closed, the axial movement of the brake disc is pressed and the brake disc cannot rotate. Due to the action of the one-way bearing, the connecting shaft 9a cannot rotate forward and can only rotate reversely. When the normally closed one-way braking mechanism 10 is opened, the axial movement of the brake disc is reset and can rotate freely, and the connecting shaft 9a can rotate freely; the clutch mechanism 11 has a driving disc and a driven disc. There is a bushing with a sliding key fit in the central hole of the driving disc. The bushing is connected and fixed to one end of the connecting rotating shaft 9b. The driving disc can move axially along the bushing through the sliding key fit with the bushing. The driven disc is connected and fixed to one end of the connecting shaft 9a. When the clutch mechanism 11 is closed, the driving disc moves axially and combines with the driven disc, that is, the connecting shaft 9a and the connecting rotating shaft 9b form a coupling connection; there is a one-way bearing 20 on the connecting rotating shaft 9b. The one-way bearing 20 is a structure of the prior art. Due to the action of the one-way bearing, when the clutch mechanism 11 is energized and closed, the connecting shaft 9a can only rotate forward along with the connecting rotating shaft 9b and cannot rotate reversely. When the clutch mechanism 11 is de-energized and separated, the driving disc and the driven disc are separated, and the connecting shaft 9a can rotate freely. It should be noted here that according to the change in the installation position of the normally closed one-way braking mechanism 10, the connection and fixing method thereof is not unique, but the cooperation and connection relationship with the connecting shaft 9a are the same. In Embodiment 1, the normally closed one-way braking mechanism 10 is fixed on the plate 17a in the second housing 17. In specific implementation, it can also be fixed on other adjacent components.

[0071] Embodiment 2, see Figure 5 。

[0072] The structure of Embodiment 2 is deformed with the Figure 2 shown structure. The push rod device 4 in this example is the same as that described in Embodiment 1; relative to Figure 2 the shown Embodiment 1, the deformed structure of this example lies in that one end of the connecting shaft 9a and the inner end of the threaded rotating shaft 4a are set as an integral body, that is, the connection between one end of the connecting shaft 9a and the inner end of the threaded rotating shaft 4a is a connection structure in which the two are set as an integral body. When the connection between one end of the connecting shaft 9a and the inner end of the threaded rotating shaft 4a is in the form of a connection structure set as an integral body, the Figure 2 shown wall plate 17b may not be provided in the second housing 17; the others are the same as Embodiment 1.

[0073] Embodiment 3, seeFigure 6 。

[0074] The structure of Embodiment 3 is another variation of the structure shown in Figure 2 In this example, the push rod device 4 is the same as that described in Embodiment 1; relative to Figure 2 Embodiment 1 shown, the difference in this embodiment is that one end of the connecting rotating shaft 9b is integrally provided with the front end of the motor shaft 5a, that is, the connection between one end of the connecting rotating shaft 9b and the front end of the motor shaft 5a is a connection structure form in which the two are integrally provided. In this structural state, the connecting rotating shaft 9b is equivalent to an extended shaft section at the front end of the motor shaft 5a. When the connection between one end of the connecting rotating shaft 9b and the front end of the motor shaft 5a is a connection structure in which the two are integrally provided, the support member 20a shown in Figure 2 does not need to be provided in the second housing 17, and the one-way bearing 20 can be provided on the front end plate of the housing of the motor 5, that is, the one-way bearing 20 is supported by the front end plate of the housing of the motor 5. In practice, the one-way bearing 20 can also be located at the rear end of the motor shaft 5a, that is, the one-way bearing 20 is supported by the rear end plate of the housing of the motor 5; in addition, one end of the connecting shaft 9a is integrally provided with the inner end of the threaded rotating shaft 4a, that is, the connection between one end of the connecting shaft 9a and the inner end of the threaded rotating shaft 4a is a connection structure form in which the two are integrally provided. When the connection between one end of the connecting shaft 9a and the inner end of the threaded rotating shaft 4a is a connection structure form in which the two are integrally provided, the wall plate 17b shown in Figure 2 does not need to be provided in the second housing 17. See Figure 6 and Figure 2 ; others are the same as Embodiment 1.

[0075] In specific implementation, Figure 2 the shown implementation structure can also be deformed as follows: one end of the connecting rotating shaft 9b is integrally provided with the front end of the motor shaft 5a, that is, the connection between one end of the connecting rotating shaft 9b and the front end of the motor shaft 5a is a connection structure form in which the two are integrally provided, and one end of the connecting shaft 9a and the inner end of the threaded rotating shaft 4a adopt a coupling connection structure.

[0076] Embodiment 4, see Figure 7 。

[0077] Figure 7 As shown in, a speed reduction mechanism 6 is provided, that is, on the basis of the "push rod device 4, motor 5, one-way control mechanism 9 for controlling the pushing operation condition" in the foregoing embodiment, a speed reduction mechanism 6 is additionally provided. The speed reduction mechanism 6 has an input shaft 6a and an output shaft 6b, and the speed reduction mechanism 6 is a prior art structure;

[0078] Figure 7 As shown in, the connecting shaft 9a is a segmented body structure of a first segmented body 9a01 and a second segmented body 9a02;

[0079] Figure 7The rotating shaft in the transmission system of the illustrated embodiment includes the motor shaft 5a, the threaded rotating shaft 4a, the first segment 9a01 and the second segment 9a02 of the connecting shaft 9a, the connecting rotating shaft 9b, and the input shaft 6a and the output shaft 6b of the speed reduction mechanism 6; one end of the connecting rotating shaft 9b is connected to the motor shaft 5a, the other end of the connecting rotating shaft 9b is connected to one end of the clutch mechanism 11, the other end of the clutch mechanism 11 is connected to one end of the second segment 9a02 of the connecting shaft 9a, the other end of the second segment 9a02 is connected to the input shaft 6a of the speed reduction mechanism 6, the output shaft 6b of the speed reduction mechanism 6 is connected to one end of the first segment 9a01 of the connecting shaft 9a, and the other end of the first segment 9a01 is connected to the inner end of the threaded rotating shaft 4a; when the motor 5 operates, the motor shaft 5a can drive the connecting rotating shaft 9b, the second segment 9a02, the input shaft 6a and the output shaft 6b of the speed reduction mechanism 6, and the first segment 9a01 and the threaded rotating shaft 4a to rotate forward. During the operating condition, when the threaded rotating shaft 4a rotates reversely, the first segment 9a01, the output shaft 6b and the input shaft 6a of the speed reduction mechanism 6 and the second segment 9a02 rotate reversely accordingly;

[0080] Figure 7 The implementation structure of the push rod device 4 shown in is the same as that in Embodiment 1, see Figure 7 and Figure 2 the structure shown in and the relevant description in Embodiment 1;

[0081] In a specific embodiment, one end of the connecting rotating shaft 9b and the front end of the motor shaft 5a are integrally arranged, that is, the connection between one end of the connecting rotating shaft 9b and the front end of the motor shaft 5a is a connection structure form in which the two are integrally arranged. The connecting rotating shaft 9b is equivalent to an extended shaft segment at the front end of the motor shaft 5a. When the connection between one end of the connecting rotating shaft 9b and the front end of the motor shaft 5a is a connection structure arranged integrally, the one-way bearing 20 is arranged on the front end plate of the motor housing of the motor 5, that is, the one-way bearing 20 can be supported by the front end plate of the motor housing of the motor 5, or other components can be arranged in the second sub-housing 1702 of the second housing 17 for support; in practice, one end of the connecting rotating shaft 9b and the front end of the motor shaft 5a can also be connected by a coupling; the other end of the second segment 9a02 and the shaft end of the input shaft 6a of the speed reduction mechanism 6 are arranged in an integrally connected structure. In practice, it can also be connected by a coupling; the connection between one end of the first segment 9a01 and the shaft end of the output shaft 6b of the speed reduction mechanism 6 is a connection structure form in which the two are integrally arranged. In practice, it can also be connected by a coupling; the other end of the first segment 9a01 and the inner end of the threaded rotating shaft 4a are connected by a coupling; in practice, when one end of the first segment 9a01 and the output shaft 6b of the speed reduction mechanism 6 are in a coupling connection structure, the other end of the first segment 9a01 and the inner end of the threaded rotating shaft 4a can be arranged in an integrally connected structure;

[0082] The normally closed one-way braking mechanism 10 is provided on the first segmented body 9a01, and the one-way bearing 20 is provided on the connecting rotating shaft 9b; the connection method and effect of the normally closed one-way braking mechanism 10 and the effect of the one-way bearing 20 are the same as those described in Embodiment 1;

[0083] The second housing 17 is a split housing structure of a first sub-housing 1701 and a second sub-housing 1702, corresponding to the first segmented body 9a01 and the second segmented body 9a02 of the connecting shaft 9a. One end of the first sub-housing 1701 is connected to the side wall of the adjacent speed reduction mechanism 6, and the other end is connected to the connecting plate 12. One end of the second sub-housing 1702 is connected to the side wall of the adjacent speed reduction mechanism 6, and the other end is connected to the front end of the housing of the motor 5; Figure 7 As shown, one end of the first sub-housing 1701 and the side wall of the adjacent speed reduction mechanism 6 are the inner side wall of the speed reduction mechanism 6, and one end of the second sub-housing 1702 and the side wall of the adjacent speed reduction mechanism 6 are the outer side wall of the speed reduction mechanism 6;

[0084] The first segmented body 9a01 and the normally closed one-way braking mechanism 10 connected to this segmented body are located within the first sub-housing 1701. The second segmented body 9a02, the connecting rotating shaft 9b, the one-way bearing 20 provided on the connecting rotating shaft 9b, and the clutch mechanism 11 connecting the second segmented body 9a02 and the connecting rotating shaft 9b are all located within the second sub-housing 1702; In a specific implementation, the positioning screw 10a in the normally closed one-way braking mechanism 10 is connected to the inner side wall of the speed reduction mechanism 6;

[0085] The outer shape is "one" shaped, and connecting ears 8a on the same axis are respectively provided at the outer end of the sleeve-type push rod 8 and the outer end of the other component coaxial with the sleeve-type push rod 8; Figure 7 As shown, the other component coaxial with the sleeve-type push rod 8 is the motor 5, that is, connecting ears 8a on the same axis are respectively provided on the outer end of the sleeve-type push rod 8 and the rear end (i.e., the outer end) wall of the housing of the other motor 5 coaxial with the sleeve-type push rod 8, that is, the connecting ears 8a at both ends of the present invention;

[0086] Embodiment 5, see Figure 8 。

[0087] Figure 8 The structure of the shown Embodiment 5 is based on Figure 7 the deformation of the shown structure, Figure 7 the outer shape of the shown embodiment is "one" shaped, Figure 8 the outer shape of the shown Embodiment 5 is similar to an "L" shape, and this specification calls it an "L" shape;

[0088] Figure 8As shown, a speed reduction mechanism 6 is provided, that is, on the basis of the "push rod device 4, motor 5, one-way control mechanism 9 for controlling the pushing operation condition" in Embodiment 1, the speed reduction mechanism 6 is additionally provided. The speed reduction mechanism 6 has an input shaft 6a and an output shaft 6b, and the speed reduction mechanism 6 is a structure of the prior art;

[0089] Figure 8 As shown, the connecting shaft 9a is a segmented structure of a first segmented body 9a01 and a second segmented body 9a02;

[0090] Figure 8 The rotating shafts in the transmission system of the shown embodiment include the motor shaft 5a, the threaded rotating shaft 4a, the first segmented body 9a01 and the second segmented body 9a02 of the connecting shaft 9a, the connecting rotating shaft 9b, and the input shaft 6a and the output shaft 6b of the speed reduction mechanism 6; one end of the connecting rotating shaft 9b is connected to the motor shaft 5a, the other end of the connecting rotating shaft 9b is connected to one end of the clutch mechanism 11, the other end of the clutch mechanism 11 is connected to one end of the second segmented body 9a02 of the connecting shaft 9a, the other end of the second segmented body 9a02 is connected to the input shaft 6a of the speed reduction mechanism 6, the output shaft 6b of the speed reduction mechanism 6 is connected to one end of the first segmented body 9a01 of the connecting shaft 9a, and the other end of the first segmented body 9a01 is connected to the inner end of the threaded rotating shaft 4a; when the motor 5 operates, the motor shaft 5a can drive the connecting rotating shaft 9b, the second segmented body 9a02, the input shaft 6a and the output shaft 6b of the speed reduction mechanism 6, and the first segmented body 9a01 and the threaded rotating shaft 4a to rotate forward. During the operation condition, when the threaded rotating shaft 4a rotates reversely, the first segmented body 9a01, the output shaft 6b and the input shaft 6a of the speed reduction mechanism 6 and the second segmented body 9a02 rotate reversely accordingly;

[0091] Figure 8 The implementation structure of the push rod device 4 shown is the same as that in Embodiment 1, see Figure 8 and Figure 2 the structure shown and the relevant description in Embodiment 1;

[0092] In specific implementation, one end of the connecting rotating shaft 9b is integrally provided with the front end of the motor shaft 5a, that is, the connection between one end of the connecting rotating shaft 9b and the front end of the motor shaft 5a is a connection structure form in which the two are integrally provided. The connecting rotating shaft 9b is equivalent to an extended shaft section at the front end of the motor shaft 5a. When the connection between one end of the connecting rotating shaft 9b and the front end of the motor shaft 5a is a connection structure in which they are integrally provided, the one-way bearing 20 is arranged on the front end plate of the housing of the motor 5, that is, the one-way bearing 20 can be supported by the front end plate of the housing of the motor 5, or other components can be arranged in the second sub-housing 1702 of the second housing 17 for support. In implementation, the connection between one end of the connecting rotating shaft 9b and the front end of the motor shaft 5a can also be a coupling connection; the other end of the second segmented body 9a02 and the shaft end of the input shaft 6a of the reduction mechanism 6 are integrally provided with a connection structure. In implementation, it can also be a coupling connection; one end of the first segmented body 9a01 and the output shaft 6b of the reduction mechanism 6 are in a coupling connection structure, and the other end of the first segmented body 9a01 and the inner end of the threaded rotating shaft 4a are in a connection structure form in which the two are integrally provided;

[0093] The normally closed one-way braking mechanism 10 is arranged on the first segmented body 9a01, and the one-way bearing 20 is arranged on the connecting rotating shaft 9b; the connection method and action effect of the normally closed one-way braking mechanism 10 and the action effect of the one-way bearing 20 are the same as those described in Embodiment 1;

[0094] The second housing 17 is a sub-housing structure of the first sub-housing 1701 and the second sub-housing 1702. Corresponding to the first segmented body 9a01 and the second segmented body 9a02 of the connecting shaft 9a, one end of the first sub-housing 1701 is connected to the side wall of the adjacent reduction mechanism 6, and the other end is connected to the connecting plate 12. One end of the second sub-housing 1702 is connected to the side wall of the adjacent reduction mechanism 6, and the other end is connected to the front end of the housing of the motor 5; Figure 8 As shown, one end of the first sub-housing 1701 and the side wall of the adjacent reduction mechanism 6 are the inner side wall of the reduction mechanism 6, and one end of the second sub-housing 1702 and the side wall of the adjacent reduction mechanism 6 are also the inner side wall of the reduction mechanism 6;

[0095] The first segmented body 9a01 and the normally closed one-way braking mechanism 10 connected to this segmented body are located in the first sub-housing 1701. The second segmented body 9a02, the connecting rotating shaft 9b, the one-way bearing 20 arranged on the connecting rotating shaft 9b, and the clutch mechanism 11 connecting the second segmented body 9a02 and the connecting rotating shaft 9b are all located in the second sub-housing 1702; in specific implementation, the positioning screw 10a of the normally closed one-way braking mechanism 10 is connected to the plate member 17a of the second housing 17;

[0096] The outer end of the sleeve-type push rod 8 and the outer end of the other component coaxial with the sleeve-type push rod 8 are respectively provided with connecting ears 8a on the same axis;Figure 8 As shown, the component at the other end coaxial with the sleeve-type push rod 8 is the deceleration mechanism 6. That is, connecting lugs 8a on the same axis are respectively provided on the outer end of the sleeve-type push rod 8 and on the outer side wall of the deceleration mechanism 6 at the other end coaxial with the sleeve-type push rod 8, that is, the connecting lugs 8a at both ends of the present invention.

[0097] In a specific implementation:

[0098] A transition connecting member 6c can be arranged on the inner side wall of the deceleration mechanism 6 to be connected with the plate member 17a. The connection between the transition connecting member 6c and the plate member 17a is beneficial to the integrity and stability of the external shape structure of the present electric push rod device, and plays a protective role for the coupling structure between the output shaft 6b of the deceleration mechanism and the inner end of the first segmented body 9a01.

[0099] Figure 8 In the structure shown, an intermediate transmission shaft 6e is further included in the deceleration mechanism 6. The first segmented body 9a01 can be arranged at the outer end or the inner end of the intermediate transmission shaft 6e, and the normally closed one-way braking mechanism 10 is arranged on the first segmented body 9a01.

[0100] Example 6, see Figure 9 .

[0101] Figure 9 The structure shown is a structural deformation relative to Figure 2 the structure shown, and at the same time shows an example applied to a normally closed brake.

[0102] Example 6 also includes the push rod device 4, the motor 5, and the one-way control mechanism 9 for controlling the pushing operation condition;

[0103] The structural deformation of this embodiment mainly relates to the change in the installation positions of the first spring member 7 and the second spring member 16 in the push rod device 4; Figure 2 In the shown Example 1, the first spring member 7 arranged in the first housing 13 is located between the disk member 15 at the inner end of the sleeve-type push rod 8 and the connecting plate 12, and the second spring member 16 is located between the flange 14a on the nut 14 and the end wall 8b of the sleeve-type push rod 8. In Example 6, the first spring member 7 is located between the disk member 15 at the inner end of the sleeve-type push rod 8 and the end wall 13a of the first housing 13, and the second spring member 16 is located between the flange 14a on the nut 14 and the disk member 15 at the inner end of the sleeve-type push rod 8; Figure 2In the first spring member 7 and the second spring member 16 described in the illustrated Embodiment 1 and the first spring member 7 and the second spring member 16 described in this Embodiment 6, the thrust forces act on the sleeve-type push rod 8, and the acting effects are the same. After the first thrust is achieved through the first spring member 7, the second spring member 16 is further compressed and stores energy to achieve the superimposed thrust; other structures in this Embodiment 6 are the same as Figure 2 the illustrated Embodiment 1.

[0104] Figure 9 Working process of the illustrated structural embodiment:

[0105] Figure 9 The illustrated brake mechanism 1 and Figure 2 the principle structure and acting effect of the illustrated brake mechanism 1 are the same, and the only difference between the two is that their fulcrum Zs are in different positions; Figure 2 The fulcrum Z on the illustrated brake arm 3 is located in the middle and lower part thereof, and the end point of the braking end 3a is the lower end of the brake arm 3. During the braking process, the sleeve-type push rod 8 extends outward to drive the driving end 3c of the brake arm 3 to swing outward; and Figure 9 The fulcrum Z on the illustrated brake arm 3 is located at the lower end of the illustrated brake arm 3, and the end point of the braking end 3a is located on the arm section in the middle and lower part of the brake arm 3. During the braking process, the sleeve-type push rod 8 retracts inward to drive the driving end 3c of the brake arm 3 to swing inward; both are structures of the prior art. Now, Figure 9 The working process of the illustrated structural embodiment is briefly described as follows:

[0106] 1) Working state of Embodiment 6 of the present invention during the braking release process of the normally closed brake:

[0107] Figure 9 In the illustrated braking state, the first spring member 7 is in the first thrust state after extension after achieving the primary braking, and the second spring member 16 is in the superimposed thrust state in the superimposed braking state of being further compressed and storing energy. In this state, the normally closed one-way brake mechanism 10 is in the closed state to lock the connecting shaft 9a from rotating forward, maintaining the stable and reliable superimposed thrust state of the second spring member 16. The sleeve-type push rod 8 is in the state of retracting inward, and there is a distance as Figure 9 illustrated between the outer side surface of the flange 14a on the nut 14 and the outer end of the threaded section 4b and the inner side surface of the end wall 8b of the sleeve-type push rod 8.

[0108] When the brake needs to be released, that is, the thrust state of the electric push rod is released, the normally closed one-way brake mechanism 10 is powered on and opened, and the positive locking state of the connecting shaft 9a is released. The clutch mechanism 11 is powered on and closed at the same time, so that the connecting shaft 9a and the connecting shaft 9b are in a coupling state, so that the connecting shaft 9a is in a state where it can rotate forward. In this state, the compressed second spring member 16 releases energy and extended thrust when the threaded shaft 4a can rotate forward, and drives the nut 14 to move toward the outer end along the threaded section 4b through the flange 14a on the nut 14, so that the threaded shaft 4a produces positive rotation, and the motor 5 is powered on, and the motor shaft 5a drives the connecting shaft 9b. , connecting shaft 9a, and threaded shaft 4a rotate forwardly, that is, the second spring component 16 releases energy and the thrust of extension assists the motor shaft 5a to drive the threaded shaft 4a to rotate forwardly, and the combined force of the two enables the threaded shaft 4a to rotate forwardly quickly, thereby accelerating the displacement of the nut 14 along the threaded section 4b toward the outer end, until the outer side surface of the flange 14a on the nut 14 is attached to and pressed against the inner side surface of the end wall 8b of the sleeve-type push rod 8, at this point, the extension stroke of the second spring component 16 is completed, the thrust of the extension trend of the second spring component 16 on the sleeve-type push rod 8 is eliminated, and the superimposed thrust is released, that is, the superimposed braking is released; in the process of releasing the superimposed thrust, the second spring component 16 is released. The thrust of the second spring member 16 releasing energy and stretching assists the motor shaft 5a to drive the threaded shaft 4a to rotate forward, which is beneficial to shorten the time of releasing the thrust and assist the motor starting, and can reduce the energy consumption of the motor; as the motor shaft 5a continues to drive the connecting shaft 9b, the connecting shaft 9a, and the threaded shaft 4a to rotate forward, the nut 14 continues to move toward the outer end along the threaded section 4b, and the flange 14a on the nut 14 pushes the sleeve-type push rod 8 to extend outward. The connecting ears 8a at both ends of the present invention push the driving ends 3c of the two brake arms to swing outward, and the end points of the braking ends 3a of the two brake arms move outward accordingly, until the friction plate 3d is driven to contact the braked member. When the electric push rod is disengaged to a certain gap, the first spring component 7 is compressed, and the thrust is released, that is, the brake is released. In this state, the motor 5 is powered off and stops running, and the one-way bearing 20 is locked to prevent the connecting shaft 9b from rotating in the opposite direction. The connecting shaft 9a, the threaded shaft 4a and the motor shaft 5a are unable to rotate in the opposite direction. The first spring component 7 is in a stable compressed state, thereby effectively maintaining the electric push rod in a stable reset state, that is, the brake is in a stable open state (i.e., the brake is released). In this state, the outer side surface of the flange 14a on the nut 14 and the inner side surface of the end wall 8b of the sleeve-type push rod 8 are in a fitted and pressed state.

[0109] 2) Working state of embodiment 6 of the present invention during braking by the normally closed brake:

[0110] When braking is required, that is, the electric push rod realizes the thrust state, the clutch mechanism 11 is powered off and reset to the separated state, and the coupling state of the connecting shaft 9a and the connecting rotating shaft 9b is released, that is, the locking of the connecting shaft 9a is released, so that the connecting shaft 9a is in a reversible state, and the normally closed one-way brake mechanism 10 is in the power-off closed state and does not affect the reversal of the connecting shaft 9a. In this state, the first spring member 7 in the compressed state is extended, and the disc 15 acting on the inner end of the sleeve-type push rod 8 pushes the sleeve-type push rod 8 to retract inwards. At the same time, since the outer side surface of the flange 14a on the nut 14 and the inner side surface of the end wall 8b of the sleeve-type push rod 8 are in a state of being pressed and fitted, the end wall 8b of the sleeve-type push rod 8 pushes the flange 14a on the nut 14 to move inward, and the nut 14 moves inward along the threaded section 4b accordingly. In the process of the nut 14 moving inward along the threaded section 4b, the threaded shaft 4a is driven to enter a reverse state, and the connecting shaft 9a is in a reverse state accordingly; under the thrust of the first spring member 7 which continues to extend, as the sleeve-type push rod 8 continues to retract inward, it enters the first In the pushing state, the connecting ears 8a at both ends of the present invention respectively drive the driving ends 3c of the two brake arms to swing inward, and the brake components 3b at the braking ends of the two brake arms are quickly closed inward until the friction plate 3d and the braking surface of the braked part are quickly attached and pressed, thereby realizing the first thrust. During the process of the friction plate 3d and the braking surface of the braked part being quickly attached to and pressed, the sleeve-type push rod 8 stops retracting inward. Due to the thrust of the continued extension of the first spring component 7 and the kinetic energy generated by the rotating component during the rotation process, the threaded shaft 4a continues to reverse, and the nut 14 continues to rotate. When moving inward along the threaded section 4b, the flange 14a on the nut 14 is disengaged from the inner side of the end wall 8b of the sleeve push rod 8, and the flange 14a begins to compress the second spring member 16. After the flange 14a is disengaged from the inner side of the end wall 8b of the sleeve push rod 8, the thrust of the first spring member 7 with a continuous extension trend acts on the sleeve push rod 8, and drives the driving end 3c of the brake arm to swing inward through the connecting ear 8a, so that the friction plate 3d and the braking surface of the braked part are quickly attached and pressed to enter the first-stage braking, until the first-stage braking is achieved;

[0111] In the state where the first spring member 7 realizes the first thrust, that is, the state of realizing the primary effective braking, or during the process where the first spring member 7 performs the first push, that is, the primary braking, by the action of the extended thrust, when the brake clearance becomes larger due to the wear of the friction plate, the first spring member 7 will continue to extend a certain stroke. Although the continuously extended stroke generated by the first spring member 7 will affect the first thrust effect to a certain extent, the continuously extended stroke of the first spring member 7, on the one hand, enables the relevant rotating members to continue to form kinetic energy, and on the other hand, compensates for the enlarged brake clearance, so that the friction plate and the member to be braked still remain in a state of being in contact and pressed together; in this state, due to the kinetic energy formed by the rotating members such as the threaded rotating shaft 4a, the connecting shaft 9a, and the motor shaft 5a in the reverse rotation state, the threaded rotating shaft 4a continues to rotate in reverse, and the nut 14 continues to move inward along the threaded section 4b. As the nut 14 further moves inward along the threaded section 4b, the second spring member 16 is further compressed, and the distance between the flange 14a on the nut 14 and the inner side surface of the end wall 8b of the sleeve-type push rod 8 increases after being disengaged. Until when the threaded rotating shaft 4a stops rotating in the reverse direction and the nut 14 stops moving inward, the outer side surface of the flange 14a on the nut 14 is disengaged from the inner side surface of the end wall 8b of the sleeve-type push rod 8 to such an extent as Figure 9At the shown spacing, the second spring member 16 is in a state of being further compressed and storing energy, thereby achieving a superimposed thrust. When the threaded rotating shaft 4a stops rotating in the reverse direction, the normally closed one-way braking mechanism 10 in the closed state locks the connecting shaft 9a and prevents it from rotating forward (the threaded rotating shaft 4a and the connecting shaft 9a also cannot rotate forward), keeping the second spring member 16 in a stable state of being further compressed and storing energy, thus effectively maintaining the stable thrust state of this electric push rod with a reliable pushing effect. In this state, the thrust of the stretching trend generated by the second spring member 16 after being further compressed and storing energy acts on the sleeve-type push rod 8, causing the sleeve-type push rod 8 to continue to have a tendency to retract inward, thereby further driving the driving ends 3c of the two braking arms to swing inward. That is, on the basis of the primary braking, the braking members 3b at the braking ends 3a of the two braking arms obtain a braking power source again and further close inward, enabling the friction plates to obtain a superimposed braking force to achieve superimposed braking on the piece to be braked, and the normally closed one-way braking mechanism 10 in the closed state locks the connecting shaft 9a and prevents it from rotating forward, thereby effectively maintaining the stable state of this brake with a reliable braking effect; the superimposed thrust achieved by the second spring member 16 in the state of being further compressed and storing energy, on the one hand, obtains a superimposed thrust on the basis of the thrust of the first spring member 7 to achieve the first thrust, that is, in the state of achieving the primary effective braking, thereby improving the reliability of the pushing effect, that is, the braking effect; on the other hand, when the braking gap becomes larger due to wear of the friction plates, the friction plates and the piece to be braked are in a state of being tightly pressed together to obtain the superimposed thrust achieved by the second spring member 16. Moreover, although the increased braking gap will affect the first thrust effect to a certain extent in the stroke of the continuous stretching of the first spring member 7, the thrust of the continuous stretching stroke of the first spring member 7 enables the relevant rotating members to continue to form kinetic energy, and the continuously formed kinetic energy can increase the effect of further compressing and storing energy of the second spring member 16, that is, increase the effect of the superimposed thrust achieved by the second spring member 16, enabling the normally closed brake applied in the present invention to still be in a stable and reliable braking state; compared with the prior art, the reliability of the braking effect is improved.

[0112] The structures of the push rod devices 4 in Embodiments 2 to 5 are the same as those of the push rod device 4 in Embodiment 1. In the specific implementation manner of the present invention, Figure 9 The principle structure and the acting effect of the push rod device 4 with the structure shown in are the same as those of the push rod device 4 in Embodiment 1. That is, the push rod devices 4 in Embodiments 2 to 5 can also be Figure 9 The push rod device 4 with the structure shown in.

[0113] Figure 2 and Figure 9In it, connection lugs 8a on the same axis are respectively provided at the outer ends of the sleeve-type push rod 8 and the outer end of the other component coaxial with the sleeve-type push rod 8. The two connection lugs 8a are respectively hinge-connected to the driving ends 3c of the two brake arms in the braking mechanism 1. However, due to certain differences in the connection components provided in the existing braking mechanism 1, when the present invention is applied to a brake, the connection method with the braking mechanism 1 is not unique.

[0114] Figure 10 Another form of connection between the connection lugs 8a at both ends of the present invention and the braking mechanism 1 is shown. In the illustrated braking mechanism, the driving ends 3c of the two brake arms are connected to the triangular rod system member 3e of the existing structure. In the illustration, the connection lug 8a at the lower end of the present invention is hinge-connected to an additionally provided fixing member, and the connection lug 8a at the upper end in the illustration is hinge-connected to the driving rod in the triangular rod system member 3e. That is, it shows that when the connection lugs 8a at both ends of the present invention are connected to the object to be pushed (device or mechanism), one connection lug 8a is hinge-connected to the provided fixing member, and the other connection lug 8a is connected to the object to be pushed (device or mechanism, etc.).

[0115] The various specific embodiments described in the embodiments of this specification are not all the deformed structures of the solution of the present invention. Therefore, other deformed specific embodiments based on the solution of the present invention all fall within the scope covered by the solution of the present invention.

Claims

1. Superimposed thrust electric push rod, characterized in that: It includes a push rod device (4), a motor (5) and a one-way control mechanism (9) for controlling the pushing operation condition; The one-way control mechanism (9) includes a second housing (17) and a connecting shaft (9a), a connecting rotating shaft (9b) located in the housing, and a clutch mechanism (11) is provided; The rotating shafts in the transmission system include a motor shaft (5a), a threaded rotating shaft (4a) in the push rod device (4), and the connecting shaft (9a), the connecting rotating shaft (9b) in the one-way control mechanism (9). One end of the connecting rotating shaft (9b) is connected to the motor shaft (5a), the other end of the connecting rotating shaft (9b) is connected to one end of the clutch mechanism (11), the other end of the clutch mechanism (11) is connected to one end of the connecting shaft (9a), and the other end of the connecting shaft (9a) is connected to the inner end of the threaded rotating shaft (4a); the motor shaft (5a) can drive the connecting rotating shaft (9b), the connecting shaft (9a), and the threaded rotating shaft (4a) to rotate forward. When the threaded rotating shaft (4a) rotates reversely, the connecting shaft (9a) rotates reversely accordingly; A normally closed one-way braking mechanism (10) is provided on the connecting shaft (9a), and a one-way bearing (20) is provided on the connecting rotating shaft (9b); The push rod device (4) has a connecting plate (12) and a first housing (13). The inner end of the first housing (13) is connected to the connecting plate (12). One end of the threaded rotating shaft (4a) is connected to the connecting plate (12). The threaded section (4b) at the other end of the threaded rotating shaft (4a) is located in the first housing (13). A nut (14) is provided on the threaded section (4b). The threaded section (4b) and the nut (14) form a screw transmission pair, and the thread angle is greater than the self-locking angle. A flange (14a) is provided on the nut (14). When the threaded rotating shaft (4a) rotates, the nut (14) can axially displace along the threaded section (4b), and the flange (14a) on the nut (14) displaces accordingly; A sleeve-type push rod (8) with an end wall (8b) is provided at the outer end of the first housing (13). A disc member (15) is provided at the inner end of the sleeve-type push rod (8). The disc member (15) is connected and fixed to the inner end of the sleeve-type push rod (8). The tube wall surface of the sleeve-type push rod (8) is matched with the hole on the end wall (13a) of the first housing (13). The outer end of the sleeve-type push rod (8) extends out of the end wall (13a) of the first housing (13). The flange (14a) on the nut (14) is located in the tube cavity of the sleeve-type push rod (8). The diameter of the inner hole (15a) on the disc member (15) is larger than the outer diameter of the nut (14). Under the action of an external force, the sleeve-type push rod (8) can axially extend or retract relative to the first housing (13); A first spring member (7) is provided inside the first housing (13). The first spring member (7) is located between the disk member (15) at the inner end of the sleeve-type push rod (8) and the connecting plate (12), or between the disk member (15) at the inner end of the sleeve-type push rod (8) and the end wall (13a) of the first housing (13). The thrust of the first spring member (7) acts on the sleeve-type push rod (8). A second spring member (16) is provided in the push rod device (4). The second spring member (16) is located between the flange (14a) on the nut (14) and the end wall (8b) of the sleeve-type push rod (8), or between the flange (14a) on the nut (14) and the disk member (15) at the inner end of the sleeve-type push rod (8). The thrust of the second spring member (16) acts on the sleeve-type push rod (8). Connecting lugs (8a) on the same axis are respectively provided at the outer end of the sleeve-type push rod (8) and the outer end of the other member coaxial with the sleeve-type push rod (8).

2. The stacked thrust electric push rod according to claim 1, characterized in that: The connecting shaft (9a) is of an integral structure, and the second housing (17) is of an integral structure. Corresponding to the integral connecting shaft (9a), one end of the second housing (17) is connected to the front end of the housing of the motor (5), and the other end is connected to the connecting plate (12). The positioning screw (10a) of the normally closed one-way braking mechanism (10) is connected to the plate member (17a) in the second housing (17). The one-way bearing (20) is supported by a support member (20a) on the inner wall of the second housing (17). The outer shape is "one"-shaped. Connecting lugs (8a) on the same axis are respectively provided at the outer end of the sleeve-type push rod (8) and the rear end of the housing of the motor (5) at the other end coaxial with the sleeve-type push rod (8).

3. The stacked thrust electric push rod according to claim 1, characterized in that: A reduction mechanism (6) is provided, and the connecting shaft (9a) is of a segmented structure of a first segmented body (9a01) and a second segmented body (9a02). The rotating shafts in the transmission system include the motor shaft (5a), the threaded rotating shaft (4a), the first segmented body (9a01) and the second segmented body (9a02) of the connecting shaft (9a), the connecting rotating shaft (9b), and the input shaft (6a) and the output shaft (6b) of the reduction mechanism (6). One end of the connecting rotating shaft (9b) is connected to the motor shaft (5a), the other end of the connecting rotating shaft (9b) is connected to one end of the clutch mechanism (11), the other end of the clutch mechanism (11) is connected to one end of the second segmented body (9a02), the other end of the second segmented body (9a02) is connected to the input shaft (6a) of the reduction mechanism (6), the output shaft (6b) of the reduction mechanism (6) is connected to one end of the first segmented body (9a01), and the other end of the first segmented body (9a01) is connected to the inner end of the threaded rotating shaft (4a); the motor shaft (5a) can drive the connecting rotating shaft (9b), the second segmented body (9a02), the input shaft (6a) and the output shaft (6b) of the reduction mechanism (6), and the first segmented body (9a01) and the threaded rotating shaft (4a) to rotate forward. During the operating condition, when the threaded rotating shaft (4a) rotates reversely, the first segmented body (9a01), the output shaft (6b) and the input shaft (6a) of the reduction mechanism (6), and the second segmented body (9a02) rotate reversely accordingly. The normally closed one-way braking mechanism (10) is arranged on the first segmented body (9a01). The second housing (17) is a split housing structure of a first sub-housing (1701) and a second sub-housing (1702). Corresponding to the first segmented body (9a01) and the second segmented body (9a02) of the connecting shaft (9a), one end of the first sub-housing (1701) is connected to the side wall of the adjacent reduction mechanism (6), and the other end is connected to the connecting plate (12). One end of the second sub-housing (1702) is connected to the side wall of the adjacent reduction mechanism (6), and the other end is connected to the front end of the housing of the motor (5). The first segmented body (9a01) and the normally closed one-way braking mechanism (10) connected to this segmented body are located in the first sub-housing (1701). The second segmented body (9a02), the connecting rotating shaft (9b), the one-way bearing (20) arranged on the connecting rotating shaft (9b), and the clutch mechanism (11) connecting the second segmented body (9a02) and the connecting rotating shaft (9b) are all located in the second sub-housing (1702).

4. The stacked thrust electric push rod according to claim 3, wherein: The one-way bearing (20) is supported by the front end plate of the housing of the motor (5). The positioning screw (10a) in the normally closed one-way braking mechanism (10) is connected to the inner side wall of the reduction mechanism (6). The outer shape is "one" shaped. The connecting ears (8a) on the same axis are respectively provided on the outer end of the sleeve type push rod (8) and the rear end of the housing of the motor (5) at the other end coaxial with the sleeve type push rod (8).

5. The stacked thrust electric push rod according to claim 1, wherein: A reduction mechanism (6) is provided, and the connecting shaft (9a) is a segmented body structure of a first segmented body (9a01) and a second segmented body (9a02). The rotating shafts in the transmission system include the motor shaft (5a), the threaded rotating shaft (4a), the first segment (9a01) and the second segment (9a02) of the connecting shaft (9a), the connecting rotating shaft (9b), and the input shaft (6a) and the output shaft (6b) of the speed reduction mechanism (6); One end of the connecting rotating shaft (9b) is connected to the motor shaft (5a), the other end of the connecting rotating shaft (9b) is connected to one end of the clutch mechanism (11), the other end of the clutch mechanism (11) is connected to one end of the second segment (9a02), the other end of the second segment (9a02) is connected to the input shaft (6a) of the speed reduction mechanism (6), the output shaft (6b) of the speed reduction mechanism (6) is connected to one end of the first segment (9a01), and the other end of the first segment (9a01) is connected to the inner end of the threaded rotating shaft (4a); The motor shaft (5a) can drive the connecting rotating shaft (9b), the second segment (9a02), the input shaft (6a) and the output shaft (6b) of the speed reduction mechanism (6), as well as the first segment (9a01) and the threaded rotating shaft (4a) to rotate forward. When the threaded rotating shaft (4a) rotates reversely, the first segment (9a01), the output shaft (6b) and the input shaft (6a) of the speed reduction mechanism (6) and the second segment (9a02) rotate reversely accordingly; The normally closed one-way braking mechanism (10) is arranged on the first segment (9a01); The second housing (17) is a split housing structure of a first sub-housing (1701) and a second sub-housing (1702). Corresponding to the first segment (9a01) and the second segment (9a02) of the connecting shaft (9a), one end of the first sub-housing (1701) is connected to the side wall of the adjacent speed reduction mechanism (6), and the other end is connected to the connecting plate (12). One end of the second sub-housing (1702) is connected to the side wall of the adjacent speed reduction mechanism (6), and the other end is connected to the front end of the housing of the motor (5); The first segment (9a01) and the normally closed one-way braking mechanism (10) connected to this segment are located in the first sub-housing (1701). The second segment (9a02), the connecting rotating shaft (9b) and the one-way bearing (20) arranged on the connecting rotating shaft (9b), as well as the clutch mechanism (11) connecting the second segment (9a02) and the connecting rotating shaft (9b) are all located in the second sub-housing (1702); The outer shape is "L" shaped.

6. The stacked thrust electric push rod according to claim 5, characterized in that: The one-way bearing (20) is supported by the front end plate of the housing of the motor (5); The positioning screw (10a) of the normally closed one-way braking mechanism (10) is connected to the plate member (17a) in the second housing (17); The connecting ears (8a) on the same axis are respectively arranged on the outer end of the sleeve type push rod (8) and the outer side wall of the speed reduction mechanism (6) at the other end coaxial with the sleeve type push rod (8).

7. The stacked thrust electric push rod according to any one of claims 1-6, characterized in that: In the push rod device (4), a first keyway matching structure (18) composed of a sliding key and a sliding groove is provided on the outer wall surface of the nut (14) and the inner hole (15a) of the disc member (15), and a second keyway matching structure (19) composed of a groove and a key is provided on the outer edge of the disc member (15) at the inner end of the sleeve type push rod (8) and the inner wall surface of the first housing (13).

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