A linear multi-stage drive push rod

Abstract

The present invention discloses a linear multi-stage drive push rod, which belongs to the technical field of transmission devices. It comprises a tailstock, wherein a driver is fixedly mounted on one end of the tailstock and an external shell is provided on the other end; a primary push rod is provided inside the external shell; a secondary push rod is provided inside the primary push rod; a reciprocating rod is provided inside the primary push rod and is used to drive the secondary push rod to extend and retract; a driving screw rod, wherein one end of the driving screw rod is connected to the driver and the other end extends into the primary push rod and then slides and engages with the reciprocating rod; through the present invention, during use of the entire driving push rod, the primary push rod and the secondary push rod can be synchronously extended and retracted, ensuring that the extension and retraction frequencies of the two are the same, thereby avoiding the premature scrapping of the entire driving push rod due to damage caused by excessive extension and retraction frequency of a single push rod, thereby improving the service life of the driving push rod and maximizing the utilization of each push rod.

Description

Technical Field

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

[0002] As a linear brake, the drive rod is widely used in various fields such as furniture, medical treatment, and industry. It drives the internal screw through motor rotation or fluid pressure, converting rotational or fluid power into linear displacement and outputting thrust or tension.

[0003] Multi-stage actuators are a common type of actuator that can achieve a longer travel distance than single-stage actuators. However, most current multi-stage actuators do not allow the actuators on different stages to extend and retract synchronously during use. One actuator must be pushed out before the next one can be pushed. This results in the actuator on the first stage extending and retracting much more frequently than the actuators on the other stages. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a linear multi-stage driving push rod, which solves the problem in the prior art that the various levels of the driving push rod cannot be extended and retracted synchronously.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solution: a linear multi-stage drive push rod, comprising a tailstock, a driver fixedly mounted on one end of the tailstock, an external housing provided on the other end, and a distance indicator assembly mounted on the wall surface of the tailstock;

[0006] a primary push rod, disposed inside the outer shell;

[0007] A secondary push rod is arranged inside the primary push rod;

[0008] A reciprocating push rod is provided inside the first-stage push rod and is used to drive the second-stage push rod to extend and retract;

[0009] A driving screw rod, one end of which is connected to the driver, and the other end of which extends into the first-stage push rod and then slides and engages with the inside of the reciprocating push rod, and the reciprocating push rod can rotate synchronously with the driving screw rod;

[0010] The bottom of the first-stage push rod is threadedly engaged with the driving screw, and the inside of the second-stage push rod is threadedly engaged with the reciprocating rod.

[0011] By adopting the above technical solution, the first-level push rod and the second-level push rod can be synchronously extended and retracted during use of the entire driving push rod, ensuring that the extension and retraction frequencies of the two are the same, thereby avoiding the premature scrapping of the entire driving push rod due to damage caused by excessive extension and retraction frequency of a single push rod, thereby improving the service life of the driving push rod and allowing each push rod to be utilized to the maximum extent.

[0012] The present invention is further configured as follows: the recursive push rod includes an abutting section abutting against the first-stage push rod and a threaded section threadedly engaged with the second-stage push rod, a threaded line is provided on the outer wall of the threaded section, at least one clamping strip is provided on the inner ring wall, and at least one clamping groove is axially opened on the outer wall of the driving push rod to be clamped with the clamping strip.

[0013] By adopting this technical solution, the reciprocating rod and the drive screw can rotate synchronously. The physical contact between the abutment segment and the primary push rod provides direct thrust transmission, while the meshing of the threaded segment and the secondary push rod enables precise axial displacement control. The combination of the two ensures efficient conversion of force and motion in multi-stage transmission, reducing energy loss. The clip strip on the inner ring of the threaded segment and the clip groove on the drive screw form an axial sliding pair, allowing the reciprocating rod to move axially along the drive screw while restricting circumferential rotation, thereby driving the reciprocating rod to rotate during the rotation of the drive screw.

[0014] The present invention is further configured as follows: a threaded channel is provided at one end of the first-stage push rod close to the tailstock, and the driving screw is threadably engaged with the first-stage push rod through the threaded channel.

[0015] By adopting the above technical solution, the forward and backward movement of the first-stage push rod can be controlled by driving the screw rod in forward and reverse rotation, and the coordinated extension and retraction of the multi-stage push rod can be achieved by combining the abutment between the recursive push rod and the first-stage push rod.

[0016] The present invention is further configured as follows: an extension section is extended inwardly from one end of the first-stage push rod, a stepped groove is formed between the extension section and the inner wall surface of the first-stage push rod, and a rotating part is provided in the stepped groove.

[0017] By adopting the above technical solution, the rotating part is fixed in the stepped groove, and the other side abuts against the abutment section on the push rod, so that the push rod can reduce friction loss during the synchronous rotation with the driving screw, avoiding direct friction between the push rod and the stepped groove, and improving the service life of the push rod.

[0018] The present invention is further configured as follows: a stepped groove that is engaged with the stepped groove is provided at one end of the rotating part, a retaining ring is provided at the other end, and a plurality of balls are arranged in an equidistant array on the circumference of the retaining ring. The balls are rotatably engaged with the wall surface of the retaining ring. An annular groove is provided at the end of the abutting section, and a ball ring groove for engaging the balls is provided inside the annular groove.

[0019] By adopting the above technical solution, the abutment section of the push rod is replaced by a rotating part to engage with the stepped slot, so that the push rod will not generate friction loss with the stepped slot during the synchronous rotation of the push rod with the driving screw, thereby improving the service life of the push rod. At the same time, through the rapid engagement of the rotating part and the push rod, the push rod can be quickly inserted and assembled into the first-level push rod.

[0020] The present invention is further configured as follows: the distance indicating assembly includes an indicator disk, a driving shaft is provided at the center of the indicator disk, and the end of the driving shaft located in the tailstock cavity is transmission-connected to the driving screw through two bevel gears.

[0021] By adopting the above technical solution, the indicator disc is linked to the drive screw through the bevel gear set, converting the linear displacement of the push rod into a rotation angle display, and the operator can directly read the dial data.

[0022] The present invention is further configured such that: an outer ring of the indicator disk is engraved with an indicator scale, and an end portion of the driving shaft is provided with an indicator needle.

[0023] By adopting the above technical solution, the distance extended by the push rod can be displayed in real time, so that the staff can quickly and intuitively observe the travel status of the push rods at each level.

[0024] The present invention is further configured as follows: the indicator dial is provided with a distance display screen for displaying the number of rotations of the indicator needle, and two plus and minus touch rods for counting the number of rotations of the pointer, one end of the plus and minus touch rod protruding from the end surface of the indicator dial, and a touch plate is provided at the bottom of the other end. When the plus and minus touch rod sinks and contacts the touch plate under the push of the indicator needle, the number on the distance display screen increases or decreases.

[0025] By adopting this technical solution, the two feelers respond to forward / reverse signals, forming a fully closed-loop feedback system with the bevel gear drive and threaded push rod. The system drives the lead screw to rotate, which in turn drives the indicator needle, which pushes the plus / minus feeler rod down to contact the touch plate. The number of revolutions of the indicator needle is then displayed digitally on the distance display, forming a complete chain from execution to monitoring. The number of revolutions of the indicator needle represents the extension and retraction distance of the push rod, allowing the distance display to display the total distance extended by the primary and secondary push rods in real time during the extension and retraction process.

[0026] The present invention is further configured as follows: a piston push rod is rotatably provided on the recursive push rod, a sealing piston is connected to the end of the piston push rod, the sealing piston slides in the secondary push rod, an air hole channel is provided on the end of the secondary push rod facing outward, an internal hollow exhaust plate is provided at the end of the secondary push rod, a plurality of exhaust holes are distributed in an array on the exhaust plate, and the air hole channel is connected to the interior of the exhaust plate.

[0027] By adopting the above technical solution, the gas discharged through the exhaust hole during the return stroke of the driving push rod can blow away the dust around the two push rods, thereby improving the smoothness of the push rod and reducing friction loss.

[0028] The present invention is further configured as follows: a rotatable connecting head is installed at the end of the extended end of the secondary push rod, a spherical connecting hole is provided at the end of the connecting head, and a spherical connecting piece is provided in the spherical connecting hole.

[0029] By adopting the above technical solution, the driving push rod can achieve more flexible motion transmission. Secondly, the spherical contact surface can disperse the load, avoid edge stress concentration, and improve wear resistance.

[0030] The beneficial effects of the present invention are:

[0031] By setting up the recursive push rod, the first and second push rods can be driven synchronously, making full use of each telescopic rod in the drive push rod, avoiding the situation where a single push rod causes the entire drive push rod to be scrapped prematurely due to excessive use. At the same time, during the operation of the drive push rod, since the first and second push rods are extended and retracted synchronously, the entire driving process is driven by the drive screw, making the entire thrust stroke more stable and the pushing accuracy higher.

[0032] The distance indicating component can display the moving distance of the driving push rod in real time, so that the operator can accurately grasp the moving stroke of the driving push rod through the distance indicating component.

[0033] Through the setting of the piston push rod and the sealing piston, in conjunction with the exhaust plate and the exhaust hole, during the extension and return stroke of the two push rods, the air discharged through the exhaust hole can blow away the dust around the push rods, thereby reducing the risk of dust adhesion during the return stroke of the push rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0035] Figure 2 This is a schematic diagram of the internal disassembly structure of the present invention;

[0036] Figure 3 It is a schematic diagram of the three-dimensional structure of the rotating member and the recursive rod of the present invention;

[0037] Figure 4 Schematic diagram of the three-dimensional structure of the driving screw rod of the present invention;

[0038] Figure 5 Schematic diagram of the internal structure of the present invention;

[0039] Figure 6 This is a schematic diagram of the three-dimensional structure of the distance indicating assembly of the present invention;

[0040] Figure 7 It is a schematic diagram of the internal three-dimensional structure of the secondary push rod of the present invention.

[0041] Figure: 1, tailstock; 2, driver; 3, outer housing; 4, primary push rod; 401, threaded channel; 402, extension section; 5, secondary push rod; 6, recursive push rod; 601, abutment section; 6011, ring groove; 6012, ball ring groove; 602, threaded section; 603, clamping strip; 7, drive screw; 701, clamping groove; 8, rotating part; 801, stepped clamping groove; 802, clamping ring; 803, ball; 9 , distance indicating assembly; 901, indicator plate; 902, driving shaft; 903, bevel gear; 904, indicator scale; 905, indicator needle; 906, plus or 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 DESCRIPTION

[0042] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further explained below with reference to specific illustrations.

[0043] like Figure 1 and Figure 2 As shown, a linear multi-stage drive push rod includes a tailstock 1, a driver 2, an external shell 3, a primary push rod 4, a secondary push rod 5, a recursive push rod 6 and a distance indicating assembly 9.

[0044] The driver 2 is fixedly mounted on one end of the tailstock 1, and the other end of the tailstock 1 is connected to the external housing 3 by bolts. The driver 2 is specifically a drive motor, and a drive screw 7 is connected to the drive spindle of the driver 2 through a coupling. After extending into the external housing 3, the drive screw 7 first penetrates the primary push rod 4 and has a threaded engagement section between it and the primary push rod 4. Through this threaded engagement section, the drive screw 7 can drive the primary push rod 4 to extend and retract.

[0045] In the primary push rod 4, a threaded engagement section is provided at one end of the primary push rod 4 near the tailstock 1. A threaded channel 401 is provided within this section, and the threaded channel 401 is threadedly engaged with the drive screw 7. A cavity is provided within the primary push rod 4, in which the secondary push rod 5 and the reciprocating push rod 6 are slidably provided. The reciprocating push rod 6 includes an abutting section 601 that abuts the primary push rod 4 and a threaded section 602 that is threadedly engaged with the secondary push rod 5. The thread lines are provided on the outer wall of the threaded section 602. The inner wall of the secondary push rod 5 is provided with an inner circle thread line. One end of the reciprocating push rod 6 is inserted into the secondary push rod 5 to achieve threaded engagement. The other end of the reciprocating push rod 6 is connected to the primary push rod 4 via a rotating member 8.

[0046] The driving screw 7 drives the primary push rod 4 to extend and retract through thread engagement, and the reciprocating push rod 6 drives the secondary push rod 5 to extend and retract through thread engagement.

[0047] After passing through the threaded channel 401, the drive screw 7 continues to extend and penetrate the interior of the push rod 6, slidingly engaging with the push rod 6. The inner wall surface of the push rod 6 is provided with at least one clamping strip 603, and the outer wall of the drive rod is provided with at least one engaging groove 701 axially engaged with the clamping strip 603. The clamping strip 603 and the engaging groove 701 on the drive screw 7 form an axial sliding pair, allowing the push rod 6 to move axially along the drive screw 7 but restricting circumferential rotation, thereby driving the push rod 6 to rotate during the rotation of the drive screw 7.

[0048] Specifically, in this embodiment, Figure 4 As shown, there are three engaging grooves 701 and three engaging strips 603. After the driving screw 7 extends into the interior of the reciprocating rod 6, the engaging strip 603 engages with the engaging groove 701, so that the driving screw 7 can drive the reciprocating rod 6 to rotate synchronously during the rotation process.

[0049] Furthermore, since one end of the reciprocating rod 6 is inserted into the interior of the secondary push rod 5 and is engaged through threads, when the reciprocating rod 6 rotates synchronously with the driving screw 7, the secondary push rod 5 can be pushed to extend and retract through the threads.

[0050] Through the combined linkage of the above structures, when the drive screw 7 rotates, the primary push rod 4 is pushed by the drive screw 7 to achieve extension and retraction, and the reciprocating push rod 6 rotates synchronously with the drive screw 7, thereby driving the secondary push rod 5 to extend and retract. This allows the primary push rod 4 and the secondary push rod 5 to achieve synchronous extension and retraction, ensuring that the extension and retraction frequency of the two are the same, thereby avoiding the premature scrapping of the entire drive push rod due to damage caused by excessive extension and retraction frequency of a single push rod, thereby extending the service life of the drive push rod and maximizing the utilization of each push rod.

[0051] On the other hand, since the recursive rod 6 is also pushed by the primary push rod 4 during the rotation process, it can extend and retract outward synchronously with the primary push rod 4, so that 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, which greatly increases the maximum pushing stroke of the secondary push rod 5, and thus greatly increases the maximum telescopic stroke of the entire driving push rod.

[0052] Further, such as Figure 2 and Figure 3 As shown, an extension section 402 extends inwardly from one side of the threaded channel 401 toward the inner side of the secondary push rod 5 , and a stepped groove is formed between the extension section 402 and the inner wall surface of the secondary push rod 5 , in which the rotating member 8 is arranged.

[0053] One end of the rotating part 8 is provided with a stepped groove 801 that is engaged with the stepped groove, and the other end is provided with a retaining ring 802. A plurality of balls 803 are arranged in an equidistant array on the circumference of the retaining ring 802. The balls 803 are rotatably engaged with the wall surface of the retaining ring 802. An annular groove 6011 is provided at the end of the abutting section 601, and a ball annular groove 6012 is provided inside the annular groove 6011 for engaging the balls 803.

[0054] In this embodiment, there is an interference fit between the rotating part 8 and the stepped groove. When installing the rotating part 8, first apply lubricant sufficiently on each ball 803, then align the retaining ring 802 with the ring groove 6011, and then push the two together to make the ball 803 smoothly snap into the ball ring groove 6012. The ball 803 rotates in the retaining ring 802 and the ball ring groove 6012 to achieve a rotational connection between the rotating part 8 and the push rod 6. Finally, the push rod 6 is inserted into the interior of the first-level push rod 4, so that the stepped slot 801 is snapped into the stepped groove, so that the rotating part 8 and the stepped slot 801 achieve an interference fit and are snapped into the stepped slot 801.

[0055] Through the setting of the rotating part 8, the push rod 6 can be quickly rotated and installed inside the first-stage push rod 4. The push rod 6 is fixed in the stepped groove through the rotating part 8, and the other side abuts against the abutment section 601 on the push rod 6, which can avoid direct engagement between the push rod 6 and the stepped slot 801, thereby preventing the push rod 6 from generating friction loss during rotation and improving the service life of the push rod 6.

[0056] Further, such as Figure 5 As shown, a distance indicator assembly 9 is mounted on the wall of the tailstock 1. The distance indicator assembly 9 includes an indicator disk 901. A drive shaft 902 is disposed at the center of the indicator disk 901. The end of the drive shaft 902 located within the inner cavity of the tailstock 1 is connected to the drive screw 7 via two bevel gears 903. An indicator scale 904 is engraved on the outer ring of the indicator disk 901, and an indicator needle 905 is disposed at the end of the drive shaft 902. Specifically, a pair of meshing bevel gears 903 are mounted within the tailstock 1, one of which is fixed to the screw, and the other is connected to the drive shaft 902.

[0057] The indicator needle 905 is rotated by synchronous transmission with the driving screw 7 through the bevel gear 903, and thus rotates on the indicator disk 901. During the rotation process, the staff can calculate the distance the entire driving push rod is extended and retracted outward by the number of circles rotated by the indicator needle 905 and the number indicated by the indicator needle 905, so that the staff can quickly and intuitively observe the stroke status of the driving push rod.

[0058] Specifically, such as Figure 6As shown, the indicator disk 901 is provided with a distance display screen 910 for displaying the number of rotations of the indicator needle 905, and two plus and minus touch rods 906 for counting the number of rotations of the indicator needle 905. One end of the plus and minus touch rod 906 protrudes from the end surface of the indicator disk 901, and a touch plate 907 is provided at the bottom of the other end. When the plus and minus touch rod 906 is pushed by the indicator needle 905, it sinks until it contacts the touch plate 907, and the number on the distance display screen 910 increases or decreases.

[0059] Furthermore, a fixed plate is fixed below the indicator plate 901. After the plus or minus touch rod 906 passes through the fixed plate, a contact 909 is provided at the end. The plus or minus touch rod 906 contacts the touch rod through the contact 909, and a return spring 908 is provided on the plus or minus touch rod 906 between the fixed plate and the indicator plate 901. One end of the return spring 908 is fixed to the plus or minus touch rod 906, and the other end is fixed to the fixed plate. The upper end of the plus / minus touch rod 906 protrudes to the end surface of the indicator disk 901, which is an arc surface. When the indicator needle 905 rotates to the position of the plus / minus touch rod 906, it pushes the plus / minus touch rod 906 to slide downward, the return spring 908 is compressed, and the contact 909 at the lower end of the plus / minus touch rod 906 contacts the touch plate 907, thereby increasing or decreasing the reading on the distance display screen 910. When the indicator needle 905 leaves the plus / minus touch rod 906, the upper end of the plus / minus touch rod 906 protrudes to the end surface of the indicator disk 901 again due to the action of the return spring 908.

[0060] Specifically, the reading on distance display screen 910 changes only when indicator needle 905 continuously pushes two touch rods during rotation. The two addition and subtraction touch rods 906 are designated touch rod 1 and touch rod 2, respectively. The arc between touch rod 1 and touch rod 2 is less than 90 degrees. When indicator needle 905 rotates clockwise, it first pushes touch rod 1 downward, then pushes touch rod 2 downward. The time interval between the two sliding downwards and contacting touch plate 907 is short, and the number on distance display screen 910 increases by one.

[0061] When the indicator hand 905 rotates counterclockwise, it first pushes the touch rod 2 and then pushes the touch rod 1. The time interval between the two after they slide down and contact the touch plate 907 is also small, but the order of pushing the touch rod 1 and the touch rod 2 is opposite. At this time, the number on the distance display screen 910 is reduced by one.

[0062] When indicator needle 905 pushes touch rod 1 clockwise and then immediately rotates counterclockwise, since the push of touch rod 1 does not immediately push touch rod 2, touch plate 907 is not triggered, and the reading on distance display screen 910 does not change. Similarly, when indicator needle 905 pushes touch rod 2 counterclockwise and then immediately rotates clockwise, touch plate 907 is also not triggered, and the reading on distance display screen 910 does not change.

[0063] In this embodiment, the number on the distance display screen 910 is equal to the number of clockwise rotations of the indicator needle 905. Each rotation of the indicator needle 905 on the indicator plate 901 indicates that both the primary push rod 4 and the secondary push rod 5 have extended or retracted a distance of 10 meters.

[0064] Further, such as Figure 5 As shown, a rotatable connector 10 is installed at the end of the extended end of the secondary push rod 5. This enables the driving push rod to be suitable for the combined working conditions of axial thrust and radial micro-swing. The connector 10 is fixed to the end of the secondary push rod 5 by a snap or thread, supporting quick replacement. A spherical connecting hole is provided at the end of the connector 10, and a spherical connector 11 is provided in the spherical connecting hole. The spherical connector 11 is adopted at the end of the connector 10, so that during the transmission process, the spherical connector 11 can achieve multi-angle rotation, thereby achieving more flexible motion transmission. Secondly, since the spherical contact surface can disperse the load, the edge stress concentration of the spherical connector 11 can be avoided during the force process, thereby improving wear resistance.

[0065] In another embodiment, Figure 7 As shown, a piston push rod 12 is rotatably provided on the recursive push rod 6, and a sealing piston 13 is connected to the end of the piston push rod 12. The sealing piston 13 slides in the secondary push rod 5. An air hole channel 14 is provided on the end of the secondary push rod 5 facing outward, and an internal hollow exhaust plate 15 is provided at the end of the secondary push rod 5. A plurality of exhaust holes 16 are distributed in an array on the exhaust plate 15, and the air hole channel 14 is connected to the interior of the exhaust plate 15.

[0066] When the secondary push rod 5 extends outward, air is sucked outward from the interior of the secondary push rod 5 through the exhaust hole 16 and the primary air hole channel 14. When the secondary push rod 5 contracts inward, the gas sucked in from the interior of the secondary push rod 5 is discharged through the exhaust hole 16 by the sealing piston 13 and blown toward the primary push rod 4 and the secondary push rod 5, thereby reducing dust in the air around the primary push rod 4 and the secondary push rod 5, and preventing dust adhering to the outer rod wall from being brought into the interior when the two push rods contract, thereby increasing the friction loss generated during the extension and retraction of the two push rods.

[0067] Furthermore, the exhaust hole 16 is opened obliquely, and its outlet direction is inclined toward the axis direction of the secondary push rod 5, and a guide angle is set at the end of the primary push rod 4, so that the airflow can flow along the rod walls of the secondary push rod 5 and the primary push rod 4, thereby improving the blowing effect of the airflow.

[0068] Working principle:

[0069] As for the telescopic mode of the primary push rod 4 and the secondary push rod 5, the primary push rod 4 is provided with a threaded channel 401 at the end, and the driving screw 7 penetrates the threaded channel 401 and engages with its thread. The driving screw 7 is driven to rotate by the driver 2, thereby realizing the telescopic operation of the primary push rod 4. One end of the secondary push rod 5 is arranged inside the primary push rod 4, and a reciprocating rod 6 is arranged between the secondary push rod 5 and the primary push rod 4. The reciprocating rod 6 and the driving screw 7 are mutually engaged with each other through the engaging groove 701 and the engaging strip 603, so that when the driving screw 7 rotates, the reciprocating rod 6 can also rotate synchronously with it, and the reciprocating rod 6 is threadedly engaged with the inside of the secondary push rod 5, refer to Figure 1 As shown, when the reciprocating push rod 6 rotates, it can push the secondary push rod 5 to extend and retract. The overall driving sequence is that the driving screw 7 rotates, driving the primary push rod 4 to extend and retract, and the primary push rod 4 pushes the reciprocating push rod 6 to extend and retract. At the same time, the reciprocating push rod 6 also rotates synchronously with the driving screw 7, further driving the secondary push rod 5 to extend and retract, completing the telescopic movement of the entire driving push rod. During the entire movement process, the synchronous extension and retraction of the two-stage push rods can be achieved through a single driving source. The primary push rod 4 and the secondary push rod 5 are always in a state of synchronous movement, thereby improving the utilization rate of each push rod, making the extension and retraction frequency of the two push rods the same and maintaining the same loss.

[0070] For the distance indicating assembly 9, the bevel gear 903 is engaged to drive the indicator needle 905 to rotate on the indicator disk 901, thereby pushing the plus and minus touch rods 906 on the indicator disk 901. The two plus and minus touch rods 906 are set at similar points on the indicator disk 901 (such as Figure 6 As shown, the time interval between the indicator needle 905 pushing the two plus / minus touch rods 906 is shortened. When the time interval between the contacts 909 below the two plus / minus touch rods 906 respectively hitting the contact plate 907 is less than 0.1 seconds, the reading on the distance display screen 910 changes. When the time between the contacts 909 below the two plus / minus touch rods 906 respectively hitting the contact plate 907 is greater than 0.1 seconds, the reading on the distance display screen 910 does not change. In this way, the real-time display of the extension and retraction distance of the driving push rod can be achieved.

[0071] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments and that various modifications and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such modifications and improvements are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A linear multi-stage drive push rod, characterized in that: include: A tailstock (1), wherein a driver (2) is fixedly mounted on one end of the tailstock (1), an external housing (3) is provided on the other end, and a distance indicator assembly (9) is mounted on a wall surface of the tailstock (1); A primary push rod (4) is arranged inside the outer shell (3); A secondary push rod (5) is arranged inside the primary push rod (4); A recursive push rod (6) is arranged inside the first-stage push rod (4) and is used to drive the second-stage push rod (5) to extend and retract; A driving screw rod (7), one end of which is connected to the driver (2), and the other end of which extends into the first-stage push rod (4) and is then slidably engaged with the inside of the reciprocating push rod (6), and the reciprocating push rod (6) is capable of rotating synchronously with the driving screw rod (7); Wherein, the bottom section of the first-stage push rod (4) is threadedly engaged with the driving screw rod (7), and the second-stage push rod (5) is threadedly engaged with the recursive push rod (6); The recursive push rod (6) includes an abutting section (601) abutting against the primary push rod (4); An extension section (402) extends inward from one end of the first-stage push rod (4), and 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 member (8) is provided in the stepped groove; One end of the rotating member (8) is provided with a stepped groove (801) that is mutually engaged with the stepped groove, and the other end is provided with a snap ring (802). A plurality of balls (803) are arranged in an equidistant array on the circumference of the snap ring (802), and the balls (803) are rotatably engaged with the wall surface of the snap ring (802). An annular groove (6011) is provided at the end of the abutting section (601), and a ball annular groove (6011) is provided inside the annular groove (6011) for engaging the balls (803).

2. The linear multi-stage drive push rod according to claim 1, characterized in that: The recursive rod (6) further comprises a threaded section (602) threadedly engaged with the secondary push rod (5), a threaded line is provided on the outer wall of the threaded section (602), at least one clamping strip (603) is provided on the inner wall surface, and at least one clamping groove (701) is axially provided on the outer wall of the driving screw rod (7) for clamping with the clamping strip (603).

3. The linear multi-stage driving push rod according to claim 1, characterized in that: A threaded channel (401) is provided at one end of the first-stage push rod (4) close to the tailstock (1), and the driving screw rod (7) is threadedly engaged with the first-stage push rod (4) through the threaded channel (401).

4. The linear multi-stage driving push rod according to claim 1, characterized in that: The distance indicating assembly (9) comprises an indicator disc (901), a driving shaft (902) is provided at the center of the indicator disc (901), and the end of the driving shaft (902) located in the inner cavity of the tailstock (1) is connected to the driving screw (7) through two bevel gears (903).

5. The linear multi-stage driving push rod according to claim 4, characterized in that: An outer ring of the indicator disc (901) is engraved with an indicator scale (904), and an end portion of the driving shaft (902) is provided with an indicator needle (905).

6. The linear multi-stage driving push rod according to claim 5, characterized in that: The indicator disk (901) is provided with a distance display screen (910) for displaying the number of rotations of the indicator needle (905), and two addition and subtraction touch rods (906) for counting the number of rotations of the pointer. One end of the addition and subtraction touch rod (906) protrudes from the end surface of the indicator disk (901), and a touch plate (907) is provided at the bottom of the other end. When the addition and subtraction touch rod (906) is pushed down by the indicator needle (905) and contacts the touch plate (907), the number on the distance display screen (910) increases or decreases.

7. The linear multi-stage driving push rod according to claim 1, characterized in that: A piston push rod (12) is rotatably provided on the recursive push rod (6), and a sealing piston (13) is connected to the end of the piston push rod (12). The sealing piston (13) slides in the secondary push rod (5). An air hole channel (14) is provided on the end of the secondary push rod (5) facing outward. An internal hollow exhaust plate (15) is provided at the end of the secondary push rod (5). A plurality of exhaust holes (16) are distributed in an array on the exhaust plate (15), and the air hole channel (14) is communicated with the interior of the exhaust plate (15).

8. The linear multi-stage driving push rod according to claim 1, characterized in that: A rotatable connector (10) is mounted on the end of the extended end of the secondary push rod (5), and a spherical connecting hole is provided at the end of the connector (10), and a spherical connecting member (11) is provided in the spherical connecting hole.

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