Linear multi-stage driving push rod

Abstract

The invention discloses a linear multi-stage driving push rod, and belongs to the technical field of transmission devices. Comprising a tailstock, a driver is fixedly installed at one end of the tailstock, and an outer shell is arranged at the other end of the tailstock; the first-stage push rod is arranged in the outer shell; the second-stage push rod is arranged in the first-stage push rod; the pushing rod is arranged in the first-stage pushing rod and used for driving the second-stage pushing rod to stretch out and draw back; one end of the driving screw rod is connected to the driver, and the other end of the driving screw rod extends into the first-stage push rod and then is clamped in the passing push rod in a sliding manner; according to the driving push rod, in the using process of the whole driving push rod, the first-stage push rod and the second-stage push rod can achieve synchronous stretching and retracting, it is guaranteed that the stretching and retracting frequencies of the first-stage push rod and the second-stage push rod are the same, and therefore the situation that the whole driving push rod is scrapped in advance after a single push rod is damaged due to too high stretching and retracting frequency can be avoided, and the service life of the driving push rod is prolonged; and therefore, each push rod can be utilized to the maximum extent.

Description

Technical Field

[0001] The present invention relates to a linear multi-stage drive push rod, belonging to the technical field of transmission devices. Background Art

[0002] As a linear brake, the drive push rod has a wide range of applications in various fields such as furniture, medical, and industry. It drives the internal lead screw through motor rotation or fluid pressure, converts rotational or fluid power into linear displacement, and outputs thrust or pull force.

[0003] The multi-stage push rod is a common drive push rod, which can achieve a longer stroke compared to the single-stage push rod. Most current multi-stage drive push rods cannot achieve synchronous telescoping of different levels during use. It is necessary to push one push rod before the next-level push rod can be pushed, which results in the telescoping frequency of the initially pushed push rod being much greater than that of other levels of push rods. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a linear multi-stage drive push rod, which solves the problem that the various levels of the drive push rod in the prior art cannot be telescopically synchronized.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions: a linear multi-stage drive push rod includes a tailstock. One end of the tailstock is fixedly installed with a driver, and the other end is provided with an outer housing. A distance indicating component is installed on the wall surface of the tailstock; A first-stage push rod is arranged inside the outer housing; A second-stage push rod is arranged inside the first-stage push rod; A transfer push rod is arranged inside the first-stage push rod and is used to drive the telescoping of the second-stage push rod; A drive lead screw, one end of which is connected to the driver, and the other end extends into the first-stage push rod and is slidably clamped inside the transfer push rod. The transfer push rod can rotate synchronously with the drive lead screw; Wherein, the bottom of the first-stage push rod is in threaded engagement with the drive lead screw, and the inside of the second-stage push rod is in threaded engagement with the transfer push rod By adopting the above technical solutions, during the use of the entire drive push rod, the first-stage push rod and the second-stage push rod can achieve synchronous telescoping, ensuring that their telescoping frequencies are the same. Thus, it can avoid premature scrapping of the entire drive push rod due to excessive telescoping frequency and damage of a single push rod, improve the service life of the drive push rod, and maximize the utilization of each push rod.

[0006] The present invention is further configured such that: the transfer push rod includes an abutting section that abuts against the first-stage push rod and a threaded section that is threadedly engaged with the second-stage push rod. Thread lines are provided on the outer wall of the threaded section, and at least one clamping strip is provided on the inner wall surface of the inner ring. At least one clamping groove that is clamped with the clamping strip is axially formed on the outer wall of the driving push rod.

[0007] By adopting the above technical solution, synchronous rotation of the transfer push rod and the driving lead screw can be achieved. The physical abutment between the abutting section and the first-stage push rod provides direct thrust transmission, and the engagement between the threaded section and the second-stage push rod realizes precise axial displacement control. The combination of the two ensures efficient conversion of force and motion in multi-stage transmission and reduces energy loss. The clamping strip on the inner ring of the threaded section and the clamping groove on the driving lead screw form an axial sliding pair, allowing the transfer push rod to move axially along the driving lead screw but restricting circumferential rotation, so that the transfer push rod can be driven to rotate during the rotation of the driving lead screw.

[0008] The present invention is further configured such that: a threaded channel is provided at one end of the first-stage push rod close to the tailstock, and the driving lead screw is threadedly engaged with the first-stage push rod through the threaded channel.

[0009] By adopting the above technical solution, the forward and reverse rotation of the driving lead screw can be used to control the advancement and retraction of the first-stage push rod. Combining with the abutment between the transfer push rod and the first-stage push rod, the coordinated telescoping of the multi-stage push rods is realized.

[0010] The present invention is further configured such that: an extension section extends inwardly from one end of the first-stage push rod, and a stepped groove is formed between the extension section and the inner wall surface of the first-stage push rod, and a rotating member is provided in the stepped groove.

[0011] By adopting the above technical solution, the rotating member is fixed in the stepped groove, and the other side abuts against the abutting section on the transfer push rod, so that the friction loss can be reduced during the synchronous rotation of the transfer push rod and the driving lead screw, avoiding direct friction between the transfer push rod and the stepped groove, and improving the service life of the transfer push rod.

[0012] The present invention is further configured such that: a stepped clamping groove that is clamped with the stepped groove is provided at one end of the rotating member, a clamping ring is provided at the other end, and a plurality of balls are circumferentially and equally spaced on the clamping ring. The balls are rotationally clamped on the wall surface of the clamping ring. A ring groove is formed at the end of the abutting section, and a ball ring groove for clamping the balls is formed inside the ring groove.

[0013] By adopting the above technical solution, the rotating member is used to replace the abutting section of the transfer push rod and is clamped with the stepped clamping groove, so that the transfer push rod will not generate friction loss with the stepped clamping groove during the synchronous rotation with the driving lead screw, thereby improving the service life of the transfer push rod. At the same time, through the quick clamping between the rotating member and the transfer push rod, the transfer push rod can be quickly inserted and assembled into the first-stage push rod.

[0014] The present invention is further configured such that: the distance indicating component includes an indicating disk, a driving rotating shaft is arranged at the center of the indicating disk, and the end of the driving rotating shaft in the inner cavity of the tailstock is in transmission connection with the driving lead screw through two bevel gears.

[0015] By adopting the above technical solution, the indicating disk is linked with the driving lead screw through a bevel gear set, converting the linear displacement of the push rod into a rotation angle for display, and the operator can directly read the data on the scale disk.

[0016] The present invention is further configured such that: indicating scales are engraved on the outer circle of the indicating disk, and an indicating needle is arranged at the end of the driving rotating shaft.

[0017] By adopting the above technical solution, the distance extended by the push rod can be displayed in real time, enabling the staff to quickly and intuitively observe the stroke states of each stage of the push rod.

[0018] The present invention is further configured such that: a distance display screen for displaying the number of rotation circles of the indicating needle is arranged on the indicating disk, and two plus-minus contact rods for counting the number of rotation circles of the pointer are provided. One end of each plus-minus contact rod protrudes from the end face of the indicating disk, and a contact plate is arranged at the bottom of the other end. After the plus-minus contact rod sinks and contacts the contact plate under the push of the indicating needle, the number on the distance display screen increases or decreases.

[0019] By adopting the above technical solution, the two contact rods respectively respond to positive / negative rotation signals, forming a full closed-loop feedback system together with the bevel gear transmission and the threaded push rod: when the driving lead screw rotates, the bevel gear drives the indicating needle to rotate, the indicating needle pushes the plus-minus contact rod to sink and contact the contact plate, and then the number of rotation circles of the indicating needle is displayed on the distance display screen, forming a complete link from execution to monitoring. The number of rotation circles of the indicating needle represents the telescopic distance of the driving push rod, enabling the total distance extended by the first-stage push rod and the second-stage push rod to be displayed in real time through the distance display screen during the telescopic process of the entire driving push rod.

[0020] The present invention is further configured such that: a piston push rod is rotatably arranged on the transfer push rod, a sealing piston is connected to the end of the piston push rod, the sealing piston slides in the second-stage push rod, an air hole channel is arranged at one end of the second-stage push rod facing the outside, an exhaust plate with a hollow interior is arranged at the end of the second-stage push rod, and a plurality of exhaust holes are arranged in an array on the exhaust plate, and the air hole channel is communicated with the interior of the exhaust plate.

[0021] By adopting the above technical solution, the gas discharged through the exhaust holes can blow away the dust around the two push rods during the return stroke of the driving push rod, thereby improving the smoothness of the push rod and reducing the frictional loss.

[0022] The present invention is further configured such that: a rotatable connector is installed at the end of the extended end of the secondary push rod, a spherical connection hole is provided at the end of the connector, and a spherical connecting member is provided in the spherical connection hole.

[0023] By adopting the above technical solution, the driving push rod can achieve a more flexible motion transmission. Secondly, since the spherical contact surface can disperse the load, avoid edge stress concentration, and improve wear resistance.

[0024] The beneficial effects of the present invention are: Through the arrangement of the transfer push rod, synchronous driving of the primary push rod and the secondary push rod can be achieved, and each telescopic rod in the driving push rod can be fully utilized, avoiding the situation where the entire driving push rod is prematurely scrapped due to the high usage frequency of a single push rod. At the same time, during the operation of the driving push rod, since the primary push rod and the secondary push rod are telescoped synchronously and the entire driving process is driven by the driving lead screw, the entire thrust stroke is more stable and the pushing accuracy is higher.

[0025] The distance indicating component can real-time display the pushing distance of the driving push rod, enabling the operator to accurately grasp the pushing stroke of the driving push rod through the distance indicating component.

[0026] Through the arrangement of the piston push rod and the sealing piston, in cooperation with the exhaust plate and the exhaust hole, during the telescopic return process of the two push rods, the air discharged through the exhaust hole can blow away the dust around the push rod, thereby reducing the risk of dust adhesion during the return process of the push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is an internal disassembled structural schematic diagram of the present invention; Figure 3 is a three-dimensional structural schematic diagram of the rotating member and the transfer push rod of the present invention; Figure 4 is a three-dimensional structural schematic diagram of the driving lead screw of the present invention; Figure 5 is an internal structural schematic diagram of the present invention; Figure 6 is a three-dimensional structural schematic diagram of the distance indicating component of the present invention; Figure 7 is a three-dimensional internal structural schematic diagram of the secondary push rod of the present invention.

[0028] In the figure: 1. Tailstock; 2. Driver; 3. Outer housing; 4. First-stage push rod; 401. Thread channel; 402. Extension section; 5. Second-stage push rod; 6. Transfer push rod; 601. Contact section; 6011. Ring groove; 6012. Ball ring groove; 602. Thread section; 603. Card strip; 7. Driving lead screw; 701. Clamping groove; 8. Rotating part; 801. Step clamping groove; 802. Snap ring; 803. Ball; 9. Distance indicating component; 901. Indicator disk; 902. Driving rotating shaft; 903. Bevel gear; 904. Indication scale; 905. Indicator needle; 906. Plus-minus touch rod; 907. Touch plate; 908. Return spring; 909. Contact; 910. Distance display screen; 10. Connector; 11. Spherical connector; 12. Piston push rod; 13. Sealing piston; 14. Air hole channel; 15. Exhaust plate; 16. Exhaust hole. Detailed implementation mode

[0029] In order to easily understand the technical means, creative features, achieved purposes and effects of the present invention, the present invention will be further described below with reference to specific drawings.

[0030] As Figure 1 and Figure 2 shown, a linear multi-stage driving push rod includes a tailstock 1, a driver 2, an outer housing 3, a first-stage push rod 4, a second-stage push rod 5, a transfer push rod 6 and a distance indicating component 9.

[0031] The driver 2 is fixedly installed at one end of the tailstock 1, and the other end of the tailstock 1 is connected to the outer housing 3 by bolts. The driver 2 is specifically a driving motor, and a driving lead screw 7 is connected to the driving main shaft of the driver 2 through a coupling. After the driving lead screw 7 extends into the outer housing 3, it first penetrates into the first-stage push rod 4, and there is a threaded engagement section between the driving lead screw 7 and the first-stage push rod 4. Through this threaded engagement section, the driving lead screw 7 can drive the first-stage push rod 4 to expand and contract.

[0032] In the first-stage push rod 4, the threaded engagement section is arranged at one end of the first-stage push rod 4 close to the tailstock 1. A thread channel 401 is arranged inside this section, and the thread channel 401 is in threaded engagement with the driving lead screw 7. A cavity is arranged inside the first-stage push rod 4, and a second-stage push rod 5 and a transfer push rod 6 are slidably arranged in the cavity. The transfer push rod 6 includes a contact section 601 that abuts against the first-stage push rod 4 and a thread section 602 that is in threaded engagement with the second-stage push rod 5. Thread lines are arranged on the outer wall of the thread section 602. The inner wall of the second-stage push rod 5 is provided with inner ring thread lines. One end of the transfer push rod 6 is inserted into the second-stage push rod 5 to achieve threaded engagement, and the other end of the transfer push rod 6 is connected to the first-stage push rod 4 through a rotating part 8.

[0033] The driving lead screw 7 drives the first-stage push rod 4 to expand and contract through threaded engagement, and the transfer push rod 6 drives the second-stage push rod 5 to expand and contract through threaded engagement.

[0034] After the driving lead screw 7 passes through the threaded channel 401, it continues to extend and penetrates into the inside of the transfer push rod 6, and is slidably clamped with the transfer push rod 6. At least one clamping strip 603 is provided on the inner circumferential wall surface of the transfer push rod 6, and at least one clamping groove 701 engaged with the clamping strip 603 is axially formed on the outer wall of the driving push rod. The clamping strip 603 and the clamping groove 701 on the driving lead screw 7 form an axial sliding pair, allowing the transfer push rod 6 to move axially along the driving lead screw 7 but restricting circumferential rotation, so that the transfer push rod 6 can be driven to rotate during the rotation of the driving lead screw 7.

[0035] Specifically, in this embodiment, as Figure 4 shown, both the number of the clamping grooves 701 and the clamping strips 603 is three. After the driving lead screw 7 extends into the inside of the transfer push rod 6, the clamping strips 603 are engaged with the clamping grooves 701, so that the driving lead screw 7 can drive the transfer push rod 6 to rotate synchronously during the rotation process.

[0036] Furthermore, since one end of the transfer push rod 6 is inserted into the inside of the secondary push rod 5 and meshed by threads, during the synchronous rotation of the transfer push rod 6 with the driving lead screw 7, the secondary push rod 5 can be pushed to expand and contract through thread meshing.

[0037] Through the combined linkage of the above structures, when the driving lead screw 7 is in a rotating state, the primary push rod 4 is pushed by the driving lead screw 7 to achieve expansion and contraction, and the transfer push rod 6 rotates synchronously with the driving lead screw 7, and then drives the secondary push rod 5 to expand and contract. The primary push rod 4 and the secondary push rod 5 can achieve synchronous expansion and contraction, ensuring that their expansion and contraction frequencies are the same, so as to avoid premature scrapping of the entire driving push rod due to excessive expansion and contraction frequency damage of a single push rod, improving the service life of the driving push rod, and enabling each push rod to be utilized to the maximum extent.

[0038] On the other hand, since the transfer push rod 6 is also pushed by the primary push rod 4 during the rotation process and can expand and contract outward synchronously with the primary push rod 4, the maximum stroke of the secondary push rod 5 is equal to the sum of the primary push rod 4 and the secondary push rod 5, greatly increasing the maximum pushing stroke of the secondary push rod 5, and further greatly increasing the maximum expansion and contraction stroke of the entire driving push rod.

[0039] Furthermore, as Figure 2 and Figure 3 shown, an extension section 402 extends inward from the surface of the threaded channel 401 facing the inside of the secondary push rod 5. A stepped groove is formed between the extension section 402 and the inner wall surface of the secondary push rod 5, and a rotating member 8 is provided in the stepped groove.

[0040] One end of the rotating part 8 is provided with a stepped card slot 801 that is engaged with the stepped groove, and the other end is provided with a snap ring 802. A number of ball bearings 803 are arranged in a circumferential equidistant array on the snap ring 802. The ball bearings 803 rotate and are engaged on the wall surface of the snap ring 802. An annular groove 6011 is opened at the end of the abutting section 601, and a ball bearing ring groove 6012 for engaging the ball bearings 803 is opened inside the annular groove 6011.

[0041] In this embodiment, an interference fit exists between the rotating part 8 and the stepped groove. When installing the rotating part 8, first, lubricant is fully applied to each ball bearing 803. After aligning the snap ring 802 with the annular groove 6011, the ball bearings 803 are smoothly engaged into the ball bearing ring groove 6012 by pushing the two parts. The rotating connection between the rotating part 8 and the push rod 6 is realized by the rotation of the ball bearings 803 in the snap ring 802 and the ball bearing ring groove 6012. Finally, the push rod 6 is inserted into the first-stage push rod 4, so that the stepped card slot 801 is engaged into the stepped groove, and an interference fit is achieved between the rotating part 8 and the stepped card slot 801, and the rotating part 8 is engaged in the stepped card slot 801.

[0042] Through the setting of the rotating part 8, the push rod 6 can be quickly and rotationally installed inside the first-stage push rod 4. The push rod 6 is fixed in the stepped groove by the rotating part 8, and on the other hand, it abuts against the abutting section 601 on the push rod 6, which can prevent the direct engagement between the push rod 6 and the stepped card slot 801, thereby preventing frictional loss of the push rod 6 during rotation and improving the service life of the push rod 6.

[0043] Further, as Figure 5 shown, a distance indicating component 9 is installed on the wall surface of the tailstock 1. The distance indicating component 9 includes an indicating disk 901. A driving rotating shaft 902 is arranged at the center of the indicating disk 901. The end of the driving rotating shaft 902 in the inner cavity of the tailstock 1 is in transmission connection with the driving lead screw 7 through two bevel gears 903. An indicating scale 904 is engraved on the outer circle of the indicating disk 901, and an indicating needle 905 is arranged at the end of the driving rotating shaft 902. Specifically, a pair of meshing bevel gears 903 are installed in the tailstock 1. One of the bevel gears 903 is fixed on the lead screw, and the other bevel gear 903 is connected to the driving rotating shaft 902.

[0044] The indicating needle 905 realizes synchronous transmission and rotation with the driving lead screw 7 through the transmission of the bevel gears 903, and thus rotates on the indicating disk 901. During the rotation process, the operator can calculate the distance that the entire driving push rod extends and retracts through the number of turns of the rotation of the indicating needle 905 and the indication shown by the indicating needle 905, so that the operator can quickly and intuitively observe the stroke state of the driving push rod.

[0045] Specifically, as Figure 6As shown, a distance display screen 910 for displaying the number of turns of the indicating needle 905 is provided on the indicating disc 901, and two plus / minus contact rods 906 for counting the number of turns of the indicating needle 905 are provided. One end of each plus / minus contact rod 906 protrudes from the end face of the indicating disc 901, and a contact plate 907 is provided at the bottom of the other end. When the plus / minus contact rod 906 sinks to contact the contact plate 907 under the pushing action of the indicating needle 905, the number on the distance display screen 910 increases or decreases.

[0046] Further, a fixed disc is fixed below the indicating disc 901. After passing through the fixed disc, a contact head 909 is provided at the end of the plus / minus contact rod 906. The plus / minus contact rod 906 contacts the contact rod through the contact head 909, and a return spring 908 is sleeved on the plus / minus contact rod 906 between the fixed disc and the indicating disc 901. One end of the return spring 908 is fixed on the plus / minus contact rod 906, and the other end is fixed on the fixed disc. The upper end of the plus / minus contact rod 906 protruding to the end face of the indicating disc 901 is an arc surface. When the indicating needle 905 rotates to the position of the plus / minus contact rod 906, it pushes the plus / minus contact rod 906 to slide downward, the return spring 908 is compressed, and the contact head 909 at the lower end of the plus / minus contact rod 906 contacts the contact plate 907, so that the number shown on the distance display screen 910 increases or decreases. When the indicating needle 905 leaves the plus / minus contact rod 906, due to the action of the return spring 908, the upper end of the plus / minus contact rod 906 protrudes to the end face of the indicating disc 901 again.

[0047] Specifically, only when the indicating needle 905 continuously presses two contact rods during rotation, the number shown on the distance display screen 910 changes. The two plus / minus contact rods 906 are respectively set as contact rod one and contact rod two, and the radian between contact rod one and contact rod two is less than 90 degrees. When the indicating needle 905 rotates clockwise, it first presses contact rod one to slide down, and then presses contact rod two to slide down. The time interval between their sliding down and abutting against the contact plate 907 is relatively small. At this time, the number on the distance display screen 910 increases by one.

[0048] When the indicating needle 905 rotates counterclockwise, it first presses contact rod two, and then presses contact rod one. The time interval between their sliding down and abutting against the contact plate 907 is also relatively small, but the order of pressing contact rod one and contact rod two is opposite. At this time, the number on the distance display screen 910 decreases by one.

[0049] When the indicating needle 905 presses contact rod one clockwise and then immediately rotates counterclockwise, since contact rod two is not pressed immediately after pressing contact rod one, the contact plate 907 is not triggered, and the number shown on the distance display screen 910 does not change. Similarly, when the indicating needle 905 presses contact rod two counterclockwise and then immediately rotates clockwise, the contact plate 907 is also not triggered, and the number shown on the distance display screen 910 does not change.

[0050] In this embodiment, the size of the numbers on the display screen 910 is equal to the number of clockwise rotations of the indicating needle 905. Each rotation of the indicating needle 905 on the indicating disk 901 indicates that both the first-stage push rod 4 and the second-stage push rod 5 extend and retract a stroke of one zero meter.

[0051] Furthermore, as Figure 5 shown, a rotatable connector 10 is installed at the end of the extended end of the second-stage push rod 5. This enables the drive push rod to be applicable to a combined working condition of axial thrust and radial micro-swing. The connector 10 is fixed to the end of the second-stage push rod 5 by a snap or thread, supporting quick replacement. A spherical connection hole is provided at the end of the connector 10, and a spherical connector 11 is provided inside the spherical connection hole. The end of the connector 10 uses the spherical connector 11, so that during the transmission process, the spherical connector 11 can achieve multi-angle rotation, thereby realizing a more flexible motion transmission. Secondly, since the spherical contact surface can disperse the load, the spherical connector 11 can avoid edge stress concentration during the loading process, improving wear resistance.

[0052] In another embodiment, as Figure 7 shown, a piston push rod 12 is rotatably provided on the delivery push rod 6. The end of the piston push rod 12 is connected to a sealing piston 13. The sealing piston 13 slides inside the second-stage push rod 5. An air hole channel 14 is provided on one end of the second-stage push rod 5 facing the outside. The end of the second-stage push rod 5 is provided with an exhaust plate 15 with a hollow interior. A number of exhaust holes 16 are arrayed on the exhaust plate 15. The air hole channel 14 is in communication with the interior of the exhaust plate 15.

[0053] When the second-stage push rod 5 extends outwards, the inside of the second-stage push rod 5 sucks air outwards through the exhaust holes 16 and the first air hole channel 14. When the second-stage push rod 5 contracts inwards, the gas sucked into the inside of the second-stage push rod 5 is discharged through the exhaust holes 16 by the sealing piston 13, blowing towards the direction of the first-stage push rod 4 and the second-stage push rod 5, thereby reducing the dust in the air around the first-stage push rod 4 and the second-stage push rod 5, preventing the dust adhering to the outer rod wall from being brought into the interior when the two push rods contract, and thus causing an increase in the frictional loss generated during the telescopic process of the two push rods.

[0054] Furthermore, the exhaust holes 16 are obliquely opened, and their outlet directions are inclined towards the axis direction of the second-stage push rod 5. A diversion angle is provided at the end of the first-stage push rod 4, so that the air flow can flow along the rod walls of the second-stage push rod 5 and the first-stage push rod 4, improving the blowing effect of the air flow.

[0055] Working principle: Regarding the telescopic manner of the first-level push rod 4 and the second-level push rod 5, the first-level push rod 4 is provided with a threaded channel 401 at its end. The driving lead screw 7 penetrates into the threaded channel 401 and meshes with its thread. By driving the driving lead screw 7 to rotate through the driver 2, the telescoping of the first-level push rod 4 is achieved. One end of the second-level push rod 5 is arranged inside the first-level push rod 4, and a transfer push rod 6 is arranged between the second-level push rod 5 and the first-level push rod 4. The transfer push rod 6 and the driving lead screw 7 are mutually clamped through a clamping groove 701 and a clamping bar 603, so that when the driving lead screw 7 rotates, the transfer push rod 6 can also rotate synchronously. The transfer push rod 6 is in threaded engagement with the inside of the second-level push rod 5. Referring to Figure 1 as shown, when the transfer push rod 6 rotates, it can push the second-level push rod 5 to telescope. The overall driving sequence is that the driving lead screw 7 rotates, driving the first-level push rod 4 to telescope, the first-level push rod 4 pushing the transfer push rod 6 to telescope, and at the same time the transfer push rod 6 also rotates synchronously with the driving lead screw 7, further driving the second-level push rod 5 to telescope, completing the telescopic movement of the entire driving push rod. During the entire movement process, the synchronous telescoping of the two-level push rods can be achieved through a single driving source. The first-level push rod 4 and the second-level push rod 5 are always in a synchronous movement state, so that the utilization rate of each push rod can be improved, the telescopic frequencies of the two push rods are the same, and the same losses are maintained.

[0056] Regarding the distance indicating component 9, the indicating needle 905 is driven to rotate on the indicating disk 901 through the meshing of bevel gears 903, thereby pushing the plus-minus contact rods 906 on the indicating disk 901. The two plus-minus contact rods 906 are arranged at similar positions on the indicating disk 901 (such as Figure 6 as shown), so that the time interval for the indicating needle 905 to push the two plus-minus contact rods 906 is small. When the time interval between the contacts 909 below the two plus-minus contact rods 906 respectively contacting the contact plate 907 is less than 0.1 second, the indication on the distance display screen 910 changes. When the time for the contacts 909 below the two plus-minus contact rods 906 to respectively contact the contact plate 907 is greater than 0.1 second, the indication on the distance display screen 910 does not change. Through this method, the real-time display of the telescopic distance of the driving push rod can be realized.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A linear multi-stage drive push rod, characterized in that, Comprising: A tailstock (1), one end of the tailstock (1) is fixedly installed with a driver (2), the other end is provided with an outer housing (3), and a distance indicating component (9) is installed on the wall surface of the tailstock (1); A first-stage push rod (4), arranged inside the outer housing (3); A second-stage push rod (5), arranged inside the first-stage push rod (4); A transfer push rod (6), arranged inside the first-stage push rod (4) and used to drive the telescopic movement of the second-stage push rod (5); A driving lead screw (7), one end of the driving lead screw (7) is connected to the driver (2), and the other end extends into the first-stage push rod (4) and is slidably clamped inside the transfer push rod (6), and the transfer push rod (6) can rotate synchronously with the driving lead screw (7); Wherein, the bottom section of the first-stage push rod (4) is in threaded engagement with the driving lead screw (7), and the second-stage push rod (5) is in threaded engagement with the transfer push rod (6).

2. The linear multi-stage drive push rod according to claim 1, wherein: The transfer push rod (6) includes an abutting section (601) abutting against the first-stage push rod (4) and a threaded section (602) in threaded engagement with the second-stage push rod (5). Thread lines are arranged on the outer wall of the threaded section (602), and at least one clamping strip (603) is arranged on the inner wall surface of the inner circle. At least one clamping groove (701) for clamping with the clamping strip (603) is axially opened on the outer wall of the driving lead screw (7).

3. The linear multi-stage drive push rod according to claim 1, wherein: One end of the first-stage push rod (4) close to the tailstock (1) is provided with a threaded channel (401), and the driving lead screw (7) is in threaded engagement with the first-stage push rod (4) through the threaded channel (401).

4. A linear multi-stage driving push rod according to claim 2, characterized in that: One end of the first-stage push rod (4) extends inwards to form an extension section (402). A stepped groove is formed between the extension section (402) and the inner wall surface of the first-stage push rod (4), and a rotating part (8) is arranged in the stepped groove.

5. The linear multi-stage drive push rod according to claim 4, characterized in that: One end of the rotating part is provided with a stepped clamping groove (801) that is clamped with the stepped groove, and the other end is provided with a snap ring (802). A number of balls (803) are circumferentially and equally arranged on the snap ring (802). The balls (803) are rotationally clamped on the wall surface of the snap ring (802). An annular groove (6011) is opened at the end of the abutting section (601), and a ball annular groove (6011) for clamping the balls (803) is opened inside the annular groove (6011).

6. The linear multi-stage driving push rod according to claim 1, wherein: The distance indicating component (9) includes an indicating disc (901). A driving rotating shaft (902) is arranged at the center of the indicating disc (901). The end of the driving rotating shaft (902) in the inner cavity of the tailstock (1) is in transmission connection with the driving lead screw (7) through two bevel gears (903).

7. The linear multi-stage drive push rod according to claim 6, wherein: Indicating scales (904) are engraved on the outer circle of the indicating disc (901), and an indicating needle (905) is arranged at the end of the driving rotating shaft (902).

8. A linear multi-stage drive push rod according to claim 7, characterized in that: A distance display screen (910) for displaying the number of turns of rotation of the indicating needle (905) and two plus-minus contact rods (906) for counting the number of turns of rotation of the pointer are provided on the indicating disc (901). One end of each plus-minus contact rod (906) protrudes from the end face of the indicating disc (901), and a contact plate (907) is provided at the bottom of the other end. After the plus-minus contact rod (906) sinks and contacts the contact plate (907) under the push of the indicating needle (905), the number on the distance display screen (910) increases or decreases.

9. The linear multi-stage driving push rod according to claim 1, characterized in that: A piston push rod (12) is rotatably provided on the push rod (6). A sealing piston (13) is connected to the end of the piston push rod (12). The sealing piston (13) slides within the secondary push rod (5). An air hole passage (14) is provided at one end of the secondary push rod (5) facing the outside. An exhaust plate (15) with a hollow interior is provided at the end of the secondary push rod (5). A number of exhaust holes (16) are arranged in an array on the exhaust plate (15). The air hole passage (14) communicates with the interior of the exhaust plate (15).

10. A linear multi-stage drive push rod according to claim 1, characterized in that: A rotatable connector (10) is installed at the end of the extended end of the secondary push rod (5). A spherical connection hole is provided at the end of the connector (10), and a spherical connector (11) is provided within the spherical connection hole.

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