Anti-overload mechanism of intelligent lifting putter

Abstract

The application provides an anti-overload mechanism of an intelligent lifting putter and belongs to the technical field of a transmission device containing two or more meshing elements. The anti-overload mechanism comprises a screw rod, an output gear and a steel column base are installed on the screw rod, the output gear comprises a gear disc and a gear outside the gear disc, the steel column base is located in the gear disc, a fixing sheet is arranged between the steel column base and the gear disc, a spherical groove is arranged on the fixing sheet, a plurality of through grooves are arranged along the thickness direction of the steel column base, the spherical groove and the through grooves are correspondingly arranged, a steel column is installed between the through groove and the spherical groove, and a butterfly-shaped elastic sheet is installed on the side, away from the output gear, of the steel column base. The application can not only realize multi-stage transmission, meet the requirement of large thrust and adapt to a wider range of applications, but also realize anti-overload protection in the transmission process.

Description

Technical Field

[0001] This application provides an overload protection mechanism for an intelligent lifting push rod, belonging to the technical field of transmission devices containing two or more meshing elements. Background Technology

[0002] Push rods are widely used in industries such as manufacturing and agriculture. For example, in parking brakes, an electrically driven push rod is raised and lowered to level and support the vehicle when parking outdoors. However, the application of push rods in different fields is quite specific. For instance, if the thrust is severely limited, the interoperability between different push rods is poor, requiring different push rods for different situations. As an auxiliary emergency tool, push rods are not used frequently, resulting in a high rate of idleness in cars and homes, and their utilization rate is not ideal. This leads to overload and equipment damage in some emergency situations. Utility Model Content

[0003] In view of this, this application provides an overload protection mechanism for an intelligent lifting push rod, which not only achieves overload protection in terms of structure and avoids damage to the push rod, but also meets the requirements of a large range of thrust and meets the needs of various application environments.

[0004] Specifically, this application is implemented through the following scheme:

[0005] An overload protection mechanism for an intelligent lifting push rod includes a lead screw, on which an output gear and a steel column base are mounted. The output gear includes a gear disk and gears on the outer periphery of the gear disk. The steel column base is located in the gear disk, and a fixing plate is provided between the steel column base and the gear disk. The fixing plate is provided with a spherical groove, and multiple through slots are provided along the thickness direction of the steel column base. The spherical groove and the through slots are correspondingly arranged. The steel column is installed between the through slots and the spherical groove. A butterfly-shaped spring is installed on the side of the steel column base away from the output gear.

[0006] Furthermore, as a preferred option:

[0007] A fixing plate is provided between the butterfly-shaped spring and the steel column base to limit the upward path of the steel column and prevent it from falling off.

[0008] The butterfly-shaped spring is also equipped with a fixing plate to prevent it from falling off due to excessive displacement.

[0009] It also includes a motor, a secondary transmission unit, and a tertiary transmission unit. The secondary transmission unit includes a secondary transmission shaft, a secondary helical gear, and a secondary pinion. The secondary helical gear and the secondary pinion are respectively mounted on the secondary transmission shaft, and the secondary helical gear meshes with the shaft teeth of the motor output shaft. The tertiary transmission unit includes a tertiary transmission shaft, a tertiary gear, and a tertiary pinion. The tertiary gear and the tertiary pinion are respectively mounted on the tertiary transmission shaft, and the tertiary gear meshes with the secondary pinion. The output gear meshes with the tertiary pinion.

[0010] The output shaft has 4 to 8 teeth, the second-stage helical gear has 22 to 24 teeth, the second-stage pinion has 18 to 22 teeth, the third-stage gear has 34 to 36 teeth, the third-stage pinion has 34 to 36 teeth, and the output gear has 36 to 38 teeth.

[0011] The motor shaft is a steel shaft with helical teeth distributed around its circumference. A motor shaft sleeve is provided at the end of the motor shaft. The end of the motor shaft sleeve is polygonal or has a polygonal groove. When used with a wrench of a corresponding shape, the motor shaft can be manually rotated to handle unexpected situations such as power outages.

[0012] The secondary helical gear is a plastic gear. While meeting the force requirements such as friction during rotation, the plastic gear also reduces noise generation, achieving low-noise operation of the push rod.

[0013] The secondary pinion is mounted on the secondary transmission shaft via two bushings.

[0014] The third-stage gear is mounted on the third-stage transmission shaft via two bushings.

[0015] The two bushings form a double bushing installation method, which improves the noise reduction effect. For the gears with the two installation positions that are relatively far out, the noise can be effectively reduced.

[0016] The three-stage transmission shaft is equipped with a clamping plate, a pair of butterfly springs, and a locking plate. The three-stage gear has multiple protrusions, and the clamping plate has locking teeth that engage with adjacent protrusions, creating a gap between them. The clamping plate, butterfly springs, and locking plates are installed in sequence, and the locking plates are engaged in the locking groove of the three-stage transmission shaft.

[0017] The screw connecting shaft has a section with a toothless surface, and the output gear is mounted on the screw connecting shaft through a bushing.

[0018] The pull tail is mounted on the lead screw connecting shaft via a ball bearing. More preferably, the ball bearing and the pull tail are connected by a needle roller bearing. A bearing base is also included, through which the ball bearing and the pull tail are mounted on the end of the lead screw connecting shaft.

[0019] The device also includes a housing with a cover plate and a box cover at each end. A motor cable is installed on one side of the cover plate, and the motor cable is connected to a power board assembly. The motor cable and the power board assembly supply power to the motor. The motor shaft, secondary transmission unit, tertiary transmission unit, and output unit are all located inside the box cover. More preferably, a cover plate is provided between the box cover and the housing, and the motor shaft passes through the cover plate. The secondary and tertiary transmission shafts are both mounted on the cover plate. The pull tail is fixed to the box cover by a hexagonal nut. The box cover has a through hole, which corresponds to the motor shaft.

[0020] The sleeve includes an inner tube and an outer tube. A screw nut is installed on the screw near the pull tail side, and an end cap is installed on the screw near the pull head side. The end cap and screw nut connect the inner tube, outer tube, and screw. More preferably, an oil seal is provided between the end cap and the inner tube. A dustproof ring is provided on the outside of the end cap.

[0021] When the aforementioned push rod is running, one end of the motor cable is connected to the power supply, and the other end supplies power to the motor via the power board assembly. The motor drives the motor shaft to rotate, and the shaft teeth mesh with the secondary helical gear, causing the secondary helical gear to rotate accordingly. The secondary helical gear, via the secondary transmission shaft, drives the secondary pinion to rotate synchronously. The secondary pinion meshes with the tertiary gear, driving the tertiary gear to rotate. The tertiary gear, via the tertiary transmission shaft, drives the tertiary pinion to rotate synchronously. The tertiary pinion meshes with the output gear, driving the output gear to rotate. The output gear is mounted on the lead screw connecting shaft, which drives the lead screw to rotate, thus achieving the lifting and lowering of the pull head relative to the sleeve. During the operation of the push rod, the pull tail can exist only as a support component, or the pull tail can be fixed to the operating site, providing support while simultaneously securing the entire push rod. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the disassembled structure of the overload protection mechanism of this application;

[0024] Figure 2 This is a diagram showing the transmission relationship between the motor shaft and the lead screw in this application;

[0025] Figure 3 This is another perspective view of the transmission relationship between the motor shaft and the lead screw in this application;

[0026] Figure 4 This is a schematic diagram of the disassembled structure of the start / stop section on the three-stage drive shaft in this application;

[0027] Figure 5 This is a three-dimensional structural diagram of the application state of this application;

[0028] Figure 6 This is a cross-sectional view of the application of this application;

[0029] Figure 7 for Figure 6 A magnified view of part A in the middle.

[0030] Numbered in the diagram: 1. Motor; 11. Motor shaft; 12. Motor bushing; 13. Housing; 14. Cover plate; 15. Box cover; 151. Through hole; 16. Motor wire; 161. Power board assembly; 17. Cover plate; 2. Secondary transmission shaft; 21. Secondary helical gear; 22. Secondary pinion; 3. Tertiary transmission shaft; 31. Tertiary gear; 32. Tertiary pinion; 33. Clamping plate; 331. Clamping gear; 34. Butterfly spring 1; 341. First spring; 342. Second spring; 35. Gap; 36. Slot; 36. Gear disc; 361. Protrusion; 37. Locking plate; 371. Shim 1; 372. 38. Gasket 2; 381. Bushing 1; 382. Bushing 2; 39. Locking groove; 4. Output gear; 41. Steel column base; 411. Through groove; 42. Steel column; 421. Fixing plate 1; 422. Fixing plate 2; 423. Spherical groove; 43. Butterfly spring 2; 431. Fixing plate 3; 5. Lead screw; 51. Lead screw connecting shaft; 52. Ball bearing; 521. Bearing base; 513. Needle roller bearing; 53. Pull tail; 531. Hex nut; 54. Lead screw nut; 55. Outer tube; 551. End cap; 552. Oil seal; 56. Inner tube; 57. Dustproof ring; 58. Pull head. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the technical solutions in the embodiments of this application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit the technical solutions of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0032] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be located directly or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the orientation or position shown in the accompanying drawings, and are only for ease of description and should not be construed as limiting the present technical solution.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of technical features. "A plurality of" means two or more, unless otherwise explicitly defined.

[0034] In this embodiment, the overload protection mechanism is installed on the lead screw 5 of the push rod. Combined with... Figures 1 to 3 The lead screw 5 is equipped with an output gear 4 and a steel column base 41. The output gear 4 includes a gear disk and gears on the outer periphery of the gear disk. The steel column base 41 and a butterfly spring 43 are installed in the gear disk. The steel column base 41 and the butterfly spring 43 are respectively mounted on the lead screw connecting shaft 51. The working mode of the butterfly spring 43 is the same as that of the butterfly spring 34. A fixing plate 421 is set between the steel column base 41 and the output gear 4. A fixing plate 422 is set between the steel column base 41 and the butterfly spring 43. A fixing plate 431 is set below the butterfly spring 43 (the side closer to the cover plate 17 is the upper side, and the opposite side is the lower side). The steel column base 41 is provided with several through slots 411, and the fixing plate 421 is provided with a spherical groove 421. The spherical groove 421 is provided corresponding to the through slots 411 and is smaller in size than the through slots 411. The steel column 42 is installed in the through slots 411 and the bottom of the steel column 42 is located in the spherical groove 423. When the load applies an external force that exceeds the torque of the butterfly spring plate 43, the steel column 42 disengages from the spherical groove 421, and the output gear 4 disengages from the lead screw connecting shaft 51, achieving the effect of physical overload prevention. The setting of the fixing plate 422 can prevent the steel column 42 from falling out from above the through slots 411.

[0035] Applying the overload protection mechanism of this application to a push rod, such as Figures 5 to 7 As shown: The push rod includes a motor 1, a housing 13, a cover plate 14, a box cover 15, a motor wire 16, a secondary transmission unit, a tertiary transmission unit, an output unit, a lead screw 5, a pull tail 53, and a pull head 58, etc.

[0036] The cover plate 14 is installed at one end of the housing 13. The motor wire 16 passes through the cover plate 14 and is connected to the power board assembly 161 inside the housing 13. The motor wire 16 and the power board assembly 161 supply power to the motor 1, which is also installed inside the housing 13.

[0037] The outer tube 55 is installed on the side of the housing 13, and the inner tube 56 is located inside the outer tube 55. The end of the outer tube 55 is sealed by an end cap 551, and an oil seal 552 is installed inside the end cap 551 to seal the outer tube 55 and the inner tube 56. To ensure the stability of the environment inside the inner tube 56, a dustproof ring 57 can also be installed on the outside of the end cap 551 to seal the connection interface of the inner tube 56.

[0038] The lead screw 5 is installed in the inner tube 56 through the lead screw nut 54. The two ends of the lead screw 5 are respectively threaded with a pull head 58 and a pull tail 53. The pull head 58 is at the same end as the motor wire 16, and the pull tail 53 is at the other end.

[0039] The cover 15 is installed at the other end of the housing 13. A through hole 151 is opened on the cover 15. The pull tail 53 passes through the cover 15 and is fixed to the cover 15 by a hexagonal nut 531.

[0040] A cover plate 17 is provided between the cover 15 and the housing 13. A secondary drive shaft 2 and a tertiary drive shaft 3 are mounted on the cover plate. The motor shaft 11 of the motor 1 passes through the cover plate 17 and has helical gears. The number of gears is four. A secondary helical gear 21 and a secondary pinion 22 are mounted on the secondary drive shaft 2 from top to bottom (the side closest to the cover plate 17 is considered the upper side). The secondary helical gear 21 has 24 teeth, and the secondary pinion 22 has 22 teeth. The secondary helical gear 21 meshes with the gears of the motor shaft 11. A tertiary drive shaft 3 is mounted on the tertiary pinion 32 and a tertiary gear 31 from top to bottom (the side closest to the cover plate 17 is considered the upper side). The tertiary gear 31 has 36 teeth, and the tertiary pinion 32 has 32 teeth. The tertiary gear 31 meshes with the secondary pinion 22.

[0041] The lead screw 5 has a toothless connecting shaft 51 at one end facing the cover plate 17. The output gear 4 is mounted on the lead screw connecting shaft 51 through a bushing. The output gear 4 has 38 teeth and meshes with the third-stage pinion 32.

[0042] A bearing base 521 is installed on the lead screw connecting shaft 51 below the output gear 4. The lead screw bearing 52 is located inside the bearing base 521 and is fitted onto the lead screw connecting shaft 51. The pull tail 53 is threaded to the end of the lead screw connecting shaft 51. The pull tail 53 is connected to the lead screw bearing 52 by a needle roller bearing 522. After the pull tail 53 passes through the cover 15, it is fixed with a hexagonal nut 531.

[0043] In the above structure, motor 1 and motor shaft 11 constitute a primary transmission unit, secondary transmission shaft 2, secondary helical gear 21 and secondary pinion 22 constitute a secondary transmission unit, tertiary transmission shaft 3, tertiary gear 31 and tertiary pinion 32 constitute a tertiary transmission unit, and output gear 4 and lead screw 5 constitute an output component. When the motor wire 16 is connected to the power supply, the motor wire 16 and the power board assembly 161 supply power to the motor 1. The motor 1 drives the motor shaft 11 to rotate. The shaft teeth of the motor shaft 11 mesh with the secondary helical gear 21, causing the secondary helical gear 21 to rotate accordingly. The secondary helical gear 21 drives the secondary pinion 22 to rotate synchronously with it via the secondary transmission shaft 2. The secondary pinion 22 meshes with the tertiary gear 31, causing the tertiary gear 31 to rotate. The tertiary gear 31 drives the tertiary pinion 32 to rotate synchronously with it via the tertiary transmission shaft 3. The tertiary pinion 32 meshes with the output gear 4, causing the output gear 4 to rotate. The output gear 4 is mounted on the lead screw connecting shaft 51, and drives the lead screw 5, which is integral with it, to rotate via the lead screw connecting shaft 51, thereby realizing the lifting and lowering of the pull head 58 relative to the outer tube 55.

[0044] The aforementioned device comprises a three-stage transmission consisting of the output shaft 11 of motor 1, a secondary transmission unit, a tertiary transmission unit, and an output unit. With the varying number of teeth at different meshing points, it can achieve a thrust output of no less than 1.22 tons, satisfying various application scenarios within this thrust range and making this type of push rod universally applicable in industrial, agricultural, and daily-use fields. Furthermore, the compact arrangement of the output shaft 11 of motor 1, the output unit, and the lead screw 5 makes the push rod relatively small overall and easy to store.

[0045] in:

[0046] The motor shaft 11 is a steel shaft with helical teeth distributed around its circumference, forming an integral structure. The secondary helical gear 21 that meshes with it can be made of plastic, ensuring smooth transmission while minimizing wear and noise between the steel and plastic materials.

[0047] A motor bushing 12 can be installed on the top of the motor shaft 11. A polygonal groove can be provided on the motor bushing 12. In case of emergency such as power failure or motor damage, a wrench corresponding to the polygon can be inserted into the groove through the through hole 151. Rotating the wrench will cause the motor bushing 12 to rotate accordingly.

[0048] Combination Figure 4 :

[0049] A pair of locking grooves 39 are provided on the side wall of the third-stage drive shaft 3, and the locking plate 37 and the washer 372 are snapped into the locking grooves 39. The third-stage gear 31 is mounted on the third-stage drive shaft 3. Three protrusions 361 are provided in the gear disk 36 of the third-stage gear 31, and a retaining plate 33 is installed at the corresponding position of the third-stage gear 31. The retaining plate 33 is provided with three retaining teeth 331, and the retaining teeth 331 are engaged between two adjacent protrusions 361 with a gap 35. The above-mentioned installation method of the retaining plate 33 and the gear disk 36, as well as the existence of the gap 35, form a reversing buffer to avoid jamming during steering switching. A butterfly spring 34 is installed above the retaining plate 33: the first spring 341 and the second spring 342. The first spring 341 and the second spring 342 can form a hollow outer bulge structure. The washer 371 (which can be an open retaining ring) is between the second spring 342 and the locking plate 37, and the washer 371 is also engaged in the locking groove 39. Double bushings 38, namely bushing 381 and bushing 382, ​​are installed at the end of the three-stage transmission shaft 3 to achieve quiet operation and prevent the three-stage gear and other components from falling off the end of the three-stage transmission shaft 3. The butterfly spring 34, the clamping plate 33, and the gear disc 36 cooperate to form the start-stop protection for the three-stage gear 31: After installation, the shim 371 compresses the butterfly spring 34 to a certain extent. When the motor 1 starts, the three-stage transmission shaft 3 drives the clamping plate 33 to rotate together until the clamping teeth 331 are in close contact with a certain protrusion 361 without gap, driving the three-stage gear 31 to rotate together, which can realize automatic start-stop when the load is too large and the motor cannot start; when the motor stops running, when the rotational torque is lower than the torque applied by the butterfly spring 34, a gap 35 appears between the clamping teeth 331 and the protrusion 361, the three-stage gear 31 disengages from the clamping plate 33, the three-stage gear 31 stops rotating, and the clamping plate 33 resets.

[0050] When the push rod is running, the pull tail 53 can exist only as a support component, or the pull tail 53 can be fixed on the operating site to support and fix the entire push rod at the same time.

[0051] The above-described embodiments are merely illustrative of several feasible implementations of the present invention, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the present invention, nor are the embodiments intended to limit the scope of protection in the claims of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention. All equivalent implementations or changes that do not depart from the present invention should be included in the technology of the present invention.

Claims

1. An overload protection mechanism for an intelligent lifting push rod, comprising a lead screw, characterized in that: An output gear and a steel column base are mounted on the lead screw. The output gear includes a gear disk and gears on the outer periphery of the gear disk. The steel column base is located in the gear disk. A fixing plate is provided between the steel column base and the gear disk. A spherical groove is provided on the fixing plate. Multiple through slots are provided along the thickness direction of the steel column base. The spherical groove is corresponding to the through slot. The steel column is installed between the through slot and the spherical groove. A butterfly-shaped spring is installed on the side of the steel column base away from the output gear.

2. The overload prevention mechanism for an intelligent lifting push rod according to claim 1, characterized in that: The butterfly-shaped spring and the steel column base are also provided with a fixing plate.

3. The overload prevention mechanism for an intelligent lifting push rod according to claim 1, characterized in that: A fixing plate is installed on the butterfly-shaped spring.

4. The overload prevention mechanism for an intelligent lifting push rod according to claim 1, characterized in that: The lead screw has a toothless connecting shaft, and the output gear is mounted on the lead screw connecting shaft via a bushing.

5. An overload prevention mechanism for an intelligent lifting push rod according to any one of claims 1 to 4, characterized in that: It also includes a motor, a secondary transmission unit, and a tertiary transmission unit. The secondary transmission unit includes a secondary transmission shaft, a secondary helical gear, and a secondary pinion. The secondary helical gear and the secondary pinion are respectively mounted on the secondary transmission shaft, and the secondary helical gear meshes with the shaft teeth of the motor output shaft. The tertiary transmission unit includes a tertiary transmission shaft, a tertiary gear, and a tertiary pinion. The tertiary gear and the tertiary pinion are respectively mounted on the tertiary transmission shaft, and the tertiary gear meshes with the secondary pinion. The output gear meshes with the tertiary pinion.

6. The overload prevention mechanism for an intelligent lifting push rod according to claim 5, characterized in that: The three-stage transmission shaft is equipped with a clamping plate, a pair of butterfly springs, and a locking plate. The three-stage gear has multiple protrusions, and the clamping plate has locking teeth that engage with adjacent protrusions, creating a gap between them. The clamping plate, butterfly springs, and locking plates are installed in sequence, and the locking plates are engaged in the locking groove of the three-stage transmission shaft.

7. The overload prevention mechanism for an intelligent lifting push rod according to claim 5, characterized in that: It also includes a sleeve, which includes an inner tube and an outer tube. The inner tube is located inside the outer tube. The lower end of the lead screw is installed in the inner tube through a lead screw nut. An end cap is installed on the upper end of the lead screw. The end cap and the lead screw nut connect the inner tube, the outer tube and the lead screw.

8. The overload prevention mechanism for an intelligent lifting push rod according to claim 5, characterized in that: The motor shaft is made of steel, with helical teeth distributed around the circumference of the motor shaft, and the secondary helical gear is made of plastic.

9. The overload prevention mechanism for an intelligent lifting push rod according to claim 5, characterized in that: It also includes a housing, with a cover plate and a box cover at each end of the housing. The cover plate is equipped with a motor wire, which is connected to a power board assembly. The motor wire and the power board assembly supply power to the motor. The motor shaft, the secondary transmission unit, the tertiary transmission unit, and the output gear are all located inside the box cover.

10. The overload prevention mechanism for an intelligent lifting push rod according to claim 9, characterized in that: A cover plate is provided between the box cover and the shell, the motor shaft passes through the cover plate, and the secondary and tertiary transmission shafts are both mounted on the cover plate.

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