CN218066400U - Inside and outside footpath size measurement device of bearing - Google Patents

Abstract

The utility model provides a device for measuring the inner and outer diameter dimensions of a bearing, which comprises a frame, a lifting support seat, a pressing propulsion mechanism, an outer diameter measuring mechanism and an inner diameter measuring mechanism; the inner diameter and the outer diameter of the bearing can be measured simultaneously, and compared with a mode of respectively detecting the inner diameter and the outer diameter in the prior art, the device is simple in structure and high in measurement efficiency.

Description

Inner and outer diameter size measuring device of bearing

Technical Field

The utility model relates to a detection area of bearing, concretely relates to inside and outside footpath size measurement device of bearing.

Background

The bearing is a relatively precise accessory, the requirements on appearance and size are relatively strict, and the bearing is required to meet the standard of related industries, so that the parameters of the bearing such as each size, appearance and the like are required to be detected before the bearing leaves a factory. In the prior art, the measurement of the inner diameter and the outer diameter of the bearing is separated, two mechanisms and stations are needed, the cost is high, and the detection time is long.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides an inside and outside footpath size measuring device of bearing and based on this measuring device's measuring method can measure the inside and outside footpath size of bearing simultaneously, and simple structure and measurement of efficiency are high.

In order to achieve the above purpose, the utility model provides a technical scheme as follows:

a bearing inner and outer diameter size measuring device comprises a rack, a lifting support seat, a pressing and pushing mechanism, an outer diameter measuring mechanism and an inner diameter measuring mechanism, wherein the lifting support seat, the pressing and pushing mechanism, the outer diameter measuring mechanism and the inner diameter measuring mechanism are assembled on the rack; the lifting support seat is used for supporting a bearing to be measured, and the pressing and pushing mechanism is provided with a pressing component corresponding to the lifting support seat so as to press the bearing on the lifting support seat to a measuring station through the pressing component; the outer diameter measuring mechanism comprises a plurality of groups of fixedly arranged blocking assemblies, at least one group of movably arranged propelling assemblies and first displacement sensors corresponding to the propelling assemblies; the blocking component and the pushing component are distributed on the periphery of the bearing to be tested; the downward pressing and pushing mechanism is also provided with a horizontal pushing assembly corresponding to the pushing assembly, so that the pushing assembly is driven to move through the horizontal pushing assembly, and the bearing is pushed to abut against the multiple groups of blocking assemblies at the same time to realize positioning; the inner diameter measuring mechanism comprises a movable component and a second displacement sensor corresponding to the movable component; the moving component corresponds to an inner ring of the bearing to be tested; the pushing down of the bearing to be tested drives the moving assembly to translate.

Furthermore, the blocking assembly comprises a fixed block and a blocking rod connected to the fixed block, the fixed block is fixed on the rack, and the blocking rod is vertically arranged to block the bearing to be detected; the rack is provided with a long slotted hole, and the fixing block is detachably fixed on the long slotted hole.

Furthermore, a slide rail is arranged on the rack, and the propelling assembly and the moving assembly are arranged on the slide rail.

Furthermore, the propelling component comprises a fixing block, a sliding block, a trigger plate, a push rod and a tension spring, and the fixing block is detachably fixed on the sliding rail; the sliding block is assembled on the sliding rail in a sliding mode, two ends of the tension spring are connected with the fixed block and the sliding block respectively, and the push rod is vertically arranged and connected to the sliding block; the trigger plate is fixed on the sliding block and corresponds to the first displacement sensor.

Furthermore, the moving assembly comprises a fixed block, a sliding block, a trigger plate, a contact rod and a tension spring, and the fixed block is detachably fixed on the sliding rail; the slider slidable assembles on the slide rail, fixed block and slider are connected respectively to the both ends of extension spring, the contact arm is vertical setting and connects on the slider, the tip of contact arm is provided with the slope spigot surface that is used for with the inner circle looks butt of the bearing that awaits measuring, the trigger plate is fixed on the slider and corresponds second displacement sensor.

Further, the first displacement sensor and the second displacement sensor are both non-contact displacement sensors.

Furthermore, the lifting support seat comprises a support seat, a spring, a guide sleeve and a guide rod, the guide rod is provided with a plurality of guide rods which are respectively connected to the support seat, the guide sleeve is fixed on the rack, the guide rod penetrates through the guide sleeve, and the spring sleeve is arranged on the guide rod and applies upward elasticity to the guide rod.

Further, the downward-pressing propelling mechanism comprises a driving assembly, a downward-pressing assembly and a horizontal-pushing assembly, wherein the downward-pressing assembly is limited to move vertically, and the horizontal-pushing assembly is limited to move horizontally; the horizontal pushing assembly and the pressing assembly form inclined guiding fit; the driving component is in driving connection with the pressing component to drive the pressing component to lift, and the lifting movement of the pressing component drives the horizontal pushing component to translate.

Furthermore, the driving assembly comprises a motor, an eccentric wheel and a connecting plate, the motor is fixed on the rack, the eccentric wheel is connected with a rotating shaft of the motor, one end of the connecting plate is hinged to an eccentric shaft of the eccentric wheel, and the other end of the connecting plate is hinged to the pressing assembly.

Further, the horizontal pushing assembly comprises a connecting block corresponding to the pushing assembly, a butting wheel is assembled on the connecting block, and an elastic buffer part is further arranged between the connecting block and the butting wheel.

A method for measuring the inner and outer diameter dimensions of a bearing comprises the following steps:

a1, providing the inner and outer diameter size measuring device of the bearing; taking a bearing standard part, putting the bearing standard part into a lifting support seat, and pressing down to a measuring station;

a2, simultaneously abutting a blocking component and a pushing component of the outer diameter measuring mechanism on the outer wall of the bearing standard component to obtain an outer diameter standard position of the bearing standard component; meanwhile, a moving component of the inner diameter measuring mechanism is abutted against the inner wall of the bearing standard component to obtain an inner diameter standard position of the bearing standard component;

a3, moving the propelling assembly to an initial position on the basis of the outer diameter standard position, and recording the distance L1 between the initial position and the outer diameter standard position; meanwhile, moving the moving assembly to an initial position on the basis of the inner diameter standard position, and recording the distance W1 between the initial position and the inner diameter standard position;

a4, starting to measure the bearing to be measured, and pressing the bearing to be measured to a measuring station; the pushing mechanism is pressed down to drive a pushing assembly of the outer diameter measuring mechanism to move from an initial position until the bearing to be measured is repositioned, and a moving distance L2 is obtained through the first displacement sensor; meanwhile, the bearing to be measured is pressed down to abut against the moving assembly of the inner diameter measuring mechanism, the moving assembly is forced to translate and yield, and finally abuts against the inner wall of the bearing to be measured, and the moving distance W2 is obtained through the second displacement sensor;

and A5, calculating to obtain the outer diameter size and the inner diameter size of the bearing to be measured.

Through the utility model provides a technical scheme has following beneficial effect:

by adopting the measuring device and the measuring method, the inner diameter and the outer diameter of the bearing can be measured simultaneously, and compared with a mode of respectively detecting the inner diameter and the outer diameter in the prior art, the device has the advantages of simple structure and high measuring efficiency.

Drawings

FIG. 1 is a schematic view showing the overall structure of an inner and outer diameter dimension measuring apparatus of a bearing according to an embodiment;

FIG. 2 is a schematic structural diagram of a device for measuring the inner and outer diameter dimensions of a bearing with the bearing added in the embodiment;

FIG. 3 is a schematic partial structural diagram I of a bearing inner and outer diameter dimension measuring device in an embodiment;

FIG. 4 is a schematic view of a second partial structure of an inner and outer diameter measurement device of a bearing in an embodiment;

FIG. 5 is a third schematic view showing a part of the structure of the inner and outer diameter measuring device of the bearing in the embodiment;

fig. 6 is a schematic view of a part of the structure of the inner and outer diameter dimension measuring device of the bearing in the embodiment.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1 to 6, the present embodiment provides a device for measuring the inner and outer diameters of a bearing, including a frame 10, and a lifting support seat 30, a push-down mechanism, an outer diameter measuring mechanism, and an inner diameter measuring mechanism 50 assembled on the frame 10; the lifting support seat 30 is used for supporting the bearing 100 to be measured, and the pushing mechanism is provided with a pushing component 22 corresponding to the lifting support seat 30, so that the bearing 100 on the lifting support seat 30 is pushed to a measuring station through the pushing component 22; with such an arrangement, the initial height of the lifting support base 30 can be consistent with the height of the transmission carrier, so that the bearing 100 can be stably transmitted, and meanwhile, the measured components (such as the blocking assembly 42 and the inner diameter measuring mechanism 50 which are described below) can be arranged to be lower than the initial height, so that the transmission of the bearing 100 is not interfered at the initial height; the transmission is smoother.

The outer diameter measuring mechanism comprises a plurality of groups of fixedly arranged blocking assemblies 42, at least one group of movably arranged propelling assemblies 41 and first displacement sensors 43 corresponding to the propelling assemblies 41; specifically, in the present embodiment, the number of the blocking members 42 is two, the number of the pushing members 41 is one, and the first displacement sensor 43 is used for sensing the displacement of the pushing members 41. Of course, in other embodiments, the number of blocking assemblies 42 and urging assemblies 41 is not limited thereto.

The blocking component 42 and the pushing component 41 are distributed on the periphery of the bearing 100 to be tested; that is, in the initial stage, when the bearing 100 to be tested is pressed down, the blocking component 42 and the pushing component 41 are both located at the periphery of the bearing 100 to be tested, and do not interfere with downward movement of the bearing 100 to be tested.

The downward-pressing pushing mechanism is also provided with a horizontal pushing component 23 corresponding to the pushing component 41, so that the horizontal pushing component 23 drives the pushing component 41 to move, and the bearing 100 is pushed to abut against the two groups of blocking components 42 at the same time to realize positioning. Namely, in the process that the bearing 100 to be measured is pressed down, the horizontal pushing component 23 drives the pushing component 41 to move, so that the bearing 100 is pushed to abut against the two groups of blocking components 42 at the same time, and three-point positioning is realized. At this point, the first displacement sensor 43 records the distance of translation of the pusher assembly 41.

The inner diameter measuring mechanism 50 comprises a movable component 51 and a second displacement sensor 52 corresponding to the movable component 51; the moving component 51 corresponds to an inner ring of the bearing 100 to be tested; the depression of the bearing under test 100 drives the translation of the mobile assembly 51. That is, in the process of pressing down the bearing 100 to be measured, the inner ring thereof will abut against the moving component 51 and force the moving component 51 to move and recede, and finally abut against the inner wall of the bearing 100 to be measured, and the second displacement sensor 52 will record the moving distance of the moving component 51.

Further, the present embodiment also provides a method for measuring the inner and outer diameter dimensions of a bearing, that is, the measurement is implemented by using the above-mentioned measuring apparatus, which specifically includes the following steps:

a1, providing the inner and outer diameter size measuring device of the bearing; the bearing standard is taken and put into the lifting support seat 30 and pressed down to the measuring station.

A2, simultaneously abutting a blocking component 42 and a pushing component 41 of the outer diameter measuring mechanism on the outer wall of the bearing standard component to obtain an outer diameter standard position of the bearing standard component; meanwhile, the moving component 51 of the inner diameter measuring mechanism is abutted against the inner wall of the bearing standard component, and the inner diameter standard position of the bearing standard component is obtained.

A3, moving the propelling assembly to an initial position on the basis of the outer diameter standard position, and recording the distance L1 between the initial position and the outer diameter standard position; and meanwhile, moving the moving assembly to an initial position on the basis of the inner diameter standard position, and recording the distance W1 between the initial position and the inner diameter standard position.

A4, starting to measure the bearing 100 to be measured, and pressing the bearing 100 to be measured to a measuring station; pushing down the propelling mechanism to drive the propelling component 41 of the outer diameter measuring mechanism to move from the initial position until the bearing 100 to be measured is repositioned, and obtaining a moving distance L2 through the first displacement sensor 43;

meanwhile, the bearing 100 to be measured is pressed downwards to abut against the moving assembly 51 of the inner diameter measuring mechanism, so that the moving assembly 51 is forced to move horizontally and give way, and finally abuts against the inner wall of the bearing 100 to be measured, and the moving distance W2 is obtained through the second displacement sensor 52.

And A5, calculating the outer diameter size and the inner diameter size of the bearing 100 to be measured. On the basis of the standard size of the bearing standard component, the actual outer diameter size and the inner diameter size of the bearing to be measured can be accurately calculated by combining the moving distance (L1 and W1) of the initial position and the actual displacement distance (L2 and W2) during measurement.

Thus, the measurement of the inner diameter and the outer diameter of the bearing 100 can be realized at the same time; compared with the mode of respectively detecting the inner diameter and the outer diameter in the prior art, the device is simple in structure and high in measurement efficiency.

Further, in this embodiment, the blocking assembly 42 includes a fixed block 421 and a stop lever 422 connected to the fixed block 421, the fixed block 421 is fixed on the frame 10, and the stop lever 422 is vertically arranged to block the bearing 100 to be tested; the structural design is simple. More specifically, the frame 10 is provided with a long slot 12, and the fixing block 421 is detachably fixed to the long slot 12; in this manner, positional adjustment of the stop assembly 42 may be achieved. Can realize the measurement of different bearing models, if during the bearing that the measurement size is littleer, can draw close a plurality of subassemblies 42 that block etc. the suitability is wider.

The rack 10 is provided with a slide rail 11, the propelling component 41 and the moving component 51 are both arranged on the slide rail 11, and the propelling component 41 and the moving component 51 can be guided to slide, so that deviation caused by displacement is prevented.

The pushing assembly 41 comprises a fixed block (defined as a first fixed block 411), a slider (defined as a first slider 412), a trigger plate (defined as a first trigger plate 414), a push rod 413 and a tension spring (defined as a first tension spring, not shown), wherein the first fixed block 411 is detachably fixed on the slide rail 11; the first sliding block 412 is slidably assembled on the sliding rail 11, two ends of the first tension spring are respectively connected with the first fixed block 411 and the first sliding block 412, and the push rod 413 is vertically arranged and connected to the first sliding block 412; the first trigger plate 414 is fixed to the first slider 412 and corresponds to the first displacement sensor 43. The initial position that can adjust propulsion subassembly 41 can be dismantled to first fixed block 411 setting, is applicable to the bearing external diameter measurement of different models. During operation, the translation assembly 23 acts on the push rod 413 and pushes the first slider 412, the first trigger plate 414 and the push rod 413 to slide on the slide rail, so as to push the bearing 100 to be measured to move, and at the same time, the movement of the first trigger plate enables the first displacement sensor 43 to sense the displacement distance. When the pushing force of the translation assembly 23 is removed, the push rod 413 is reset under the action of the first tension spring. So set up, simple structure realizes easily.

The moving assembly 51 includes a fixed block (defined as a second fixed block 511), a slider (defined as a second slider 512), a trigger plate (defined as a second trigger plate 514), a contact rod 513, and a tension spring (defined as a second tension spring, not shown), wherein the second fixed block 511 is detachably fixed on the slide rail 11; the second slider 512 is slidably assembled on the slide rail 11, two ends of the second tension spring are respectively connected to the second fixed block 511 and the second slider 512, the contact rod 513 is vertically arranged and connected to the second slider 512, an inclined guide surface 515 for abutting against an inner ring of the bearing 100 to be tested is arranged at the end of the contact rod 513, and the second trigger plate 514 is fixed on the second slider 512 and corresponds to the second displacement sensor 52. In operation, the bearing 100 to be measured is pressed against the inclined guide surface 515 of the contact rod 513, so that the contact rod 513 is forced to displace to yield, and the second trigger plate 514 moves accordingly, so that the second displacement sensor 52 senses the displacement distance. When the lifting and resetting of the lifting support base 30 is completed, the contact rod 513 loses the abutting force and is reset under the action of the second tension spring. So set up, simple structure realizes easily.

Further, the first displacement sensor 43 and the second displacement sensor 52 are both non-contact displacement sensors. The non-contact displacement sensor is adopted to realize the induction displacement, the actions of the propelling assembly 41 and the moving assembly 51 are not influenced, the service life is long, and the measuring range is relatively large.

Lift supporting seat 30 includes supporting seat 31, spring 34, uide bushing 33 and guide bar 32, supporting seat 31 is used for supporting bearing 100 that awaits measuring, guide bar 32 is provided with a plurality ofly (specifically two) and connects respectively on supporting seat 31, uide bushing 33 is fixed in on the frame 10, guide bar 32 wears to locate in the uide bushing 33, spring 34 overlaps and locates on the guide bar 32 and applys an ascending elasticity to guide bar 32. When the pressing assembly 22 acts on the bearing 100 to be tested on the supporting seat 31, the supporting seat 31 and the guide rod 32 move downwards, the spring 34 is compressed to store energy, and after the lifting supporting seat 30 loses the acting force of the pressing assembly 22, the supporting seat 31 and the guide rod 32 rise and reset under the action of the spring 34. So set up, lift supporting seat 30's simple structure.

The pushing mechanism comprises a driving assembly 21, a pushing assembly 22 and a horizontal pushing assembly 23, the pushing assembly 22 is limited to move vertically, specifically, a vertical guide rail is arranged on the rack 10, and the pushing assembly 22 is assembled on the guide rail in a sliding manner, so that vertical movement is realized.

The horizontal push assembly 23 is limited to horizontal movement; specifically, a horizontally arranged guide sleeve (not shown) is arranged on the frame 10, a horizontal guide rod 231 is arranged on the horizontal pushing assembly 23, and the horizontal guide rod 231 is sleeved in the guide sleeve to realize horizontal movement.

The horizontal pushing assembly 23 and the pressing assembly 22 form inclined guiding fit; specifically, in this embodiment, an inclined guide hole is formed in the pressing assembly 22, an inclined guide rod 232 is arranged on the horizontal pushing assembly 23, and the inclined guide rod 232 penetrates through the inclined guide hole to realize inclined guide matching. The driving component 21 is in driving connection with the pressing component 22 to drive the pressing component 22 to ascend and descend, and the ascending and descending movement of the pressing component 22 drives the horizontal pushing component 23 to translate.

Come the lift that drives simultaneously and push down subassembly 22 and the translation of flat push subassembly 23 through a set of drive assembly 21, reduction drive arrangement that can be very big, the structure is simpler, and the cost is lower. Of course, in other embodiments, the pressing assembly 22 and the horizontal pushing assembly 23 may also be driven by two sets of driving assemblies, respectively.

Further, the driving assembly 21 includes a motor 211 (preferably a servo motor or a stepping motor), an eccentric wheel 212 and a connecting plate 213, the motor 211 is fixed on the frame 10, the eccentric wheel 212 is connected with a rotating shaft of the motor 211, one end of the connecting plate 213 is hinged on an eccentric shaft of the eccentric wheel 212, and the other end is hinged on the pressing assembly 22. During operation, the motor 211 drives the eccentric wheel 212 to rotate, the rotation of the eccentric wheel 212 drives the pressing component 22 to move up and down through the connecting plate 213 which is hinged, the structure is simple, the motor 211 is used as a driving source, vibration is small, and precision control is good. Of course, in other embodiments, the structure of the driving assembly 21 is not limited thereto.

Further, the horizontal pushing assembly 23 further includes a connecting block 233 corresponding to the pushing assembly 41, specifically, the connecting block 233 is fixed on the horizontal guide rod 231, an abutting wheel 234 is mounted on the connecting block 233, and an elastic buffer (not shown) is further disposed between the connecting block 233 and the abutting wheel 234. Thus, when the horizontal pushing assembly 23 approaches the pushing assembly 41, the abutting wheel 234 is elastically abutted on the pushing assembly 41, so that the buffer effect is good, the damage caused by hard contact is prevented, and the sliding abutting between the abutting wheel 234 and the pushing assembly is not easy to block.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. The utility model provides an inside and outside footpath size measurement device of bearing which characterized in that: comprises a frame, a lifting support seat, a downward pressing and pushing mechanism, an outer diameter measuring mechanism and an inner diameter measuring mechanism, wherein the lifting support seat, the downward pressing and pushing mechanism, the outer diameter measuring mechanism and the inner diameter measuring mechanism are assembled on the frame; the lifting support seat is used for supporting a bearing to be measured, and the pressing and propelling mechanism is provided with a pressing component corresponding to the lifting support seat so as to press the bearing on the lifting support seat to a measuring station through the pressing component;

the outer diameter measuring mechanism comprises a plurality of groups of fixedly arranged blocking assemblies, at least one group of movably arranged propelling assemblies and first displacement sensors corresponding to the propelling assemblies; the blocking component and the pushing component are distributed on the periphery of the bearing to be tested; the downward pressing and pushing mechanism is also provided with a horizontal pushing assembly corresponding to the pushing assembly, so that the pushing assembly is driven to move through the horizontal pushing assembly, and then the bearing is pushed to abut against a plurality of groups of blocking assemblies at the same time to realize positioning;

the inner diameter measuring mechanism comprises a movable component and a second displacement sensor corresponding to the movable component; the moving component corresponds to an inner ring of the bearing to be tested; the pushing down of the bearing to be tested drives the moving assembly to translate.

2. The inner and outer diameter dimension measuring device of a bearing according to claim 1, characterized in that: the blocking assembly comprises a fixed block and a stop lever connected to the fixed block, the fixed block is fixed on the rack, and the stop lever is vertically arranged to block the bearing to be detected; the rack is provided with a long slotted hole, and the fixing block is detachably fixed on the long slotted hole.

3. The bearing inner and outer diameter dimension measuring device according to claim 1, characterized in that: the rack is provided with a slide rail, and the propelling assembly and the moving assembly are arranged on the slide rail.

4. The bearing inner and outer diameter dimension measuring device according to claim 3, characterized in that: the propelling assembly comprises a fixed block, a sliding block, a trigger plate, a push rod and a tension spring, and the fixed block is detachably fixed on the sliding rail; the sliding block is assembled on the sliding rail in a sliding mode, two ends of the tension spring are connected with the fixed block and the sliding block respectively, and the push rod is vertically arranged and connected to the sliding block; the trigger plate is fixed on the sliding block and corresponds to the first displacement sensor.

5. The bearing inner and outer diameter dimension measuring device according to claim 3, characterized in that: the moving assembly comprises a fixed block, a sliding block, a trigger plate, a contact rod and a tension spring, and the fixed block is detachably fixed on the sliding rail; the slider slidable assembles on the slide rail, fixed block and slider are connected respectively at the both ends of extension spring, the contact lever is vertical setting and connects on the slider, the tip of contact lever is provided with the slope spigot surface that is used for with the inner circle looks butt of the bearing that awaits measuring, the trigger plate is fixed on the slider and corresponds the second displacement sensor.

6. The bearing inner and outer diameter dimension measuring device according to claim 1, characterized in that: the lifting support seat comprises a support seat, a spring, a guide sleeve and a guide rod, the guide rod is provided with a plurality of guide sleeves and is connected to the support seat respectively, the guide sleeves are fixed on the rack, the guide rod penetrates through the guide sleeves, and the spring sleeves are arranged on the guide rods and apply upward elastic force to the guide rods.

7. The bearing inner and outer diameter dimension measuring device according to claim 1, characterized in that: the downward pressing and pushing mechanism comprises a driving assembly, a downward pressing assembly and a horizontal pushing assembly, the downward pressing assembly is limited to move vertically, and the horizontal pushing assembly is limited to move horizontally; the horizontal pushing assembly and the pressing assembly form inclined guiding fit; the driving assembly is in driving connection with the pressing assembly to drive the pressing assembly to lift, and the lifting movement of the pressing assembly drives the horizontal pushing assembly to translate.

8. The inner and outer diameter dimension measuring device of a bearing according to claim 7, wherein: the driving assembly comprises a motor, an eccentric wheel and a connecting plate, the motor is fixed on the rack, the eccentric wheel is connected with a rotating shaft of the motor, one end of the connecting plate is hinged to an eccentric shaft of the eccentric wheel, and the other end of the connecting plate is hinged to the pressing assembly.

9. The inner and outer diameter dimension measuring device of a bearing according to claim 1 or 7, characterized in that: the horizontal pushing assembly comprises a connecting block corresponding to the pushing assembly, a butting wheel is assembled on the connecting block, and an elastic buffer part is further arranged between the connecting block and the butting wheel.

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