Anti-falling mechanism of lifting platform

Abstract

The utility model relates to an anti-falling mechanism of a lifting platform. The anti-falling mechanism comprises a pin rod part, a spring, an assembly block and an electromagnetic unit which are correspondingly matched, a plurality of inserting holes are distributed in the inner fork arm around the pivot hole at intervals, counter bores correspondingly matched with the inserting holes are distributed in the outer fork arm, and threaded through holes are formed in the inner bottoms of the counter bores. The pin rod parts are matched with the counter bores in a one-to-one correspondence mode, the radial flange in the middle is matched with the counter bores, the rod body on one end side of the radial flange can be inserted into the counter bores, and the spring is arranged on the rod body on the other end side of the radial flange in a sleeved mode and can push the pin rod parts to be inserted into the counter bores. The assembly block is fixed to the outer fork arm, a cavity is formed in a block body, and the end of the side, sleeved with the spring, of the pin rod part can stretch into the cavity. The electromagnetic unit is assembled in the cavity and can selectively drive the pin rod part to move out of the inserting hole and be inserted into the inserting hole in the power-on state and the power-off state. The problem that the lifting platform falls suddenly can be effectively solved, and the situation that the lifting platform falls due to the fact that a hydraulic system breaks down is prevented.

Description

Technical Field

[0001] The utility model relates to an anti - falling mechanism for a lifting platform. Background Art

[0002] Scissor (or scissor - type) hydraulic lifting platforms are widely used due to their simple structure, low manufacturing cost, fast lifting speed and relatively stable operation state. However, existing scissor - type hydraulic lifting devices generally lack anti - falling mechanisms, and there is a certain probability that they cannot prevent the sudden descent of the lifting platform caused by hydraulic system failures, resulting in potential safety accidents. Summary of the Utility Model

[0003] An anti - falling mechanism for a lifting platform provided by the utility model can effectively solve the problem of sudden falling of a scissor - type hydraulic - structured lifting platform, prevent the sudden fall of the lifting platform caused by hydraulic system failures, and also has the advantages of simple structure, low manufacturing cost and being conducive to popularization.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an anti - falling mechanism for a lifting platform, comprising an inner fork arm, an outer fork arm, a pivot, a plurality of pin rod parts, a plurality of springs, a plurality of assembly blocks and a plurality of electromagnetic units.

[0005] The pivot hole provided in the middle of the arm plate of the inner fork arm and the pivot hole provided in the middle of the arm plate of the outer fork arm are relatively stacked and matched. The middle part of the pivot is passed through the two pivot holes, so that the two fork arms can cross into an X - shape and can rotate relative to each other to drive the lifting platform to move up and down in the vertical direction.

[0006] The pin rod parts, the springs, the assembly blocks and the electromagnetic units are in one - to - one correspondence and match.

[0007] On the end face of the inner fork arm facing the outer fork arm, a plurality of jacks are distributed at intervals outside the pivot hole; correspondingly, on the outer fork arm, counter - bores corresponding to and matching the jacks are distributed outside the pivot hole, and threaded through - holes are provided on the inner bottom surface of the counter - bores. The number of the jacks is an integer multiple of the number of the counter - bores.

[0008] The pin rod parts are in one - to - one correspondence and match with the counter - bores, and each pin rod part includes a plug section formed at one end of the pin rod, a radial flange formed in the middle of the pin rod, and a guide rod section formed at the other end of the pin rod.

[0009] The radial flange is assembled in the counter - bore, the spring is sleeved on the guide rod section, and the two ends of the spring are respectively in contact with the inner bottom surface of the counter - bore and the end face of the radial flange, and can push the radial flange and drive the end of the plug section to be inserted into the counter - bore.

[0010] The pin rod of the pin rod portion can linearly reciprocate relative to the counterbore.

[0011] One end of the assembly block matches the threaded through hole, so that the assembly block is fixedly installed on the outer fork arm.

[0012] A cavity is formed in the assembly block, and a through hole communicating with the cavity is formed on one side of the assembly block facing the outer fork arm. The free end of the guide rod section passes through the through hole and extends into the cavity.

[0013] The electromagnetic unit is assembled in the cavity and includes an armature portion and an electromagnetic disk portion. The armature portion is fixedly connected to the guide rod section. The electromagnetic disk portion is fixedly installed in the cavity opposite to the armature portion. Along with the switching of the electromagnetic disk portion between the energized and de-energized states, the armature portion can move closer to and away from the electromagnetic disk portion, and selectively drive the end of the plug section to move out of and insert into the jack.

[0014] Optionally, the outer diameter of the radial flange is the same as the inner diameter of the counterbore, so that the pin rod can linearly reciprocate relative to the counterbore.

[0015] Optionally, the through hole formed in the assembly block and communicating with the cavity is a smooth through hole, and the inner diameter of the smooth through hole is the same as the outer diameter of the guide rod section.

[0016] Optionally, an annular counterbore is formed on the end face of the inner fork arm, and the jacks are distributed on the inner bottom surface of the annular counterbore. The radial width of the annular counterbore is not less than the inner diameter of the jack, and preferably the radial width of the annular counterbore is the same as the inner diameter of the jack.

[0017] Optionally, a first nut is fitted on the end portion one of the inner end side of the pivot shaft extending out of the inner fork arm, and a radially extending pin hole is formed on the end portion one. A pin column is fixedly arranged in the pin hole. The pin column can prevent the first nut from axially moving relative to the end portion one.

[0018] Optionally, a second nut is fitted on the end portion two of the outer end side of the pivot shaft extending out of the outer fork arm, and a radially extending pin hole is formed on the end portion two. A pin column is fixedly arranged in the pin hole. The pin column can prevent the second nut from axially moving relative to the end portion two.

[0019] Optionally, an annular counterbore is formed on the end face of the second nut facing the outer fork arm. The radial width of the annular counterbore is greater than the maximum outer diameter of the assembly block, so that there is a gap between the outer wall of the end of the assembly block extending into the annular counterbore and the inner wall of the annular counterbore.

[0020] The beneficial effects of the present utility model are as follows: The present utility model can effectively solve the problem of sudden falling of the lifting platform with a scissor hydraulic structure, prevent the situation of the sudden falling of the lifting platform caused by the failure of the hydraulic system, and also has the advantages of simple structure, low manufacturing cost and being conducive to popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic cross-sectional structure diagram of this patent.

[0022] Figure 2 is Figure 1 a partial enlarged structure diagram at position A in

[0023] Figure 3 a partial structure diagram near the pivot hole on the inner fork arm.

[0024] Figure 4 a partial structure diagram near the pivot hole on the outer fork arm.

[0025] Figure 5 is a split structure diagram of the matching of the pin rod part, the spring, the assembly block and the electromagnetic unit.

[0026] Figure 6 is an external shape structure diagram of the pivot hinge matching of the inner and outer fork arms.

[0027] In the figure: 10 inner fork arm, 11 jack, 12 annular sunk groove; 20 outer fork arm, 21 counterbore, 22 threaded through hole; 30 pivot, 31 end one, 32 end two, 33 pivot hole; 40 nut one; 50 nut two, 51 annular sunk groove; 60 pin rod part, 61 plug section, 62 radial flange, 63 guide rod section, 64 external thread end, 65 screw ring; 70 spring; 80 assembly block, 81 block one, 811 smooth through hole, 82 block two, 821 cavity, 822 tapered through hole; 90 electromagnetic unit, 91 armature part, 911 ring body, 912 iron ring, 92 electromagnetic disk part, 921 screw barrel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The structures, proportions, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, terms such as "upper", "lower", "front", "rear", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present utility model.

[0029] Such as Figures 1 to 6 A falling prevention mechanism for a lifting platform as shown, which includes an inner fork arm 10, an outer fork arm 20, a pivot 30, a first nut 40 and a second nut 50 respectively arranged at both ends of the pivot 30, four pin rod parts 60, four springs 70, four assembly blocks 80 and four electromagnetic units 90. The pin rod parts 60, the springs 70, the assembly blocks 80 and the electromagnetic units 90 are in a one-to-one corresponding matching relationship.

[0030] A pivot hole 33 is provided in the middle of the arm plate of the inner fork arm 10 and is oppositely stacked and matched with a pivot hole 33 provided in the middle of the arm plate of the outer fork arm 20. And the middle part of the pivot 30 is passed through the two pivot holes 33, so that the two fork arms can cross into an X shape and can rotate relative to each other to drive the lifting platform to move up and down in the vertical direction. The technical content involved in this paragraph can refer to the prior art.

[0031] On the end face of the inner fork arm 10 facing the outer fork arm 20, eight jacks 11 are evenly arranged at intervals around the outside of the pivot hole 33; correspondingly, on the outer fork arm 20, counterbores 21 corresponding and matched with the jacks 11 are evenly arranged outside the pivot hole 33, and a threaded through hole 22 is provided on the inner bottom of the counterbore 21.

[0032] The number of the jacks 11 is an integer multiple of the number of the counterbores 21. In the illustrated scheme, the number of the jacks 11 is twice the number of the counterbores 21. In this way, when the two fork arms rotate relative to each other, the counterbores 21 and some of the jacks 11 can be quickly switched to the state where their axes are directly opposite under the condition of a relatively small rotation angle.

[0033] The pin rod parts 60 are in one-to-one corresponding matching with the counterbores 21, and include a plug segment 61 formed at one end of the pin rod, a radial flange 62 formed in the middle of the pin rod, a guide rod segment 63 formed at the other end of the pin rod, an external thread end 64 formed at the free end of the guide rod segment 63, and a screw ring 65 matched on the external thread end 64.

[0034] The radial flange 62 is assembled in the counterbore 21, enabling the outer diameter of the radial flange 62 to be consistent with the inner diameter of the counterbore 21, and restricting the straight reciprocating movement of the pin rod relative to the counterbore 21 (along the axial direction of the counterbore 21), so that the pin rod of the pin rod portion 60 can make a straight reciprocating movement relative to the counterbore 21.

[0035] The spring 70 is sleeved on the guide rod section 636, and both ends are respectively in contact with the inner bottom surface of the counterbore 21 and the end face of the radial flange 62, enabling the spring 70 to push the radial flange 62 and driving the end of the plug section 61 to be inserted into the counterbore 21.

[0036] The assembly block 80 includes a block one 81 and a block two 82 that are threadedly connected. The free end of the block one 81 is matched with the threaded through hole 22, so that the assembly block 80 is fixedly installed on the outer fork arm 20.

[0037] On one side of the block two 82 facing the block one 81, a cavity 821 is formed. A smooth through hole 811 communicating with the cavity 821 is formed on the block one 81. The inner diameter of the smooth through hole 811 can be made consistent with the outer diameter of the guide rod section 63 to restrict the straight reciprocating movement of the pin rod portion 60 relative to the counterbore 21.

[0038] After the guide rod section 63 passes through the smooth through hole 811, its free end can extend into the cavity 821.

[0039] The electromagnetic unit 90 is assembled in the cavity 821 and includes an armature portion 91 and an electromagnetic disk portion 92.

[0040] The armature portion 91 includes a ring body 911 and an iron ring 912 fixed on the outer end face of the ring body 911. The ring body 911 can be made of non-magnetic materials such as plastics and rubbers. The ring body 911 is sleeved on the external thread end 64 and can be pressed against the end of the guide rod section 63 by the screw ring 64 connected to the external thread end 64.

[0041] The electromagnetic disk portion 92 is fixedly installed at the bottom of the cavity 821 on the block two 82, so that the electromagnetic disk portion 92 and the armature portion 91 are relatively fixedly installed at both ends of the cavity 821. Along with the switching of the electromagnetic disk portion 92 between the energized and de-energized states, the armature portion 91 can move closer to and away from the electromagnetic disk portion 92, and selectively drive the end of the plug section 61 to move out of and insert into the jack 11, so as to achieve the purpose of preventing falling.

[0042] Under the above technical solution, after the two fork arms in a pair rotate relative to each other to a certain angle, they will remain in the X-cross state of the fixed angle (during which the electromagnetic unit 90 has been switched to the power-off state). At this time, the plug segment 61 may be inserted into the socket 11, or the end face of the plug segment 61 may be pressed against the end face of the inner fork arm 10 (not inserted into the socket 11). If it is the former state, when the hydraulic system of the scissor-type hydraulic lifting platform fails and can no longer effectively support each pair of fork arms to remain in the X-cross state of the fixed angle, the two fork arms in a pair will not rotate relative to each other at any angle and can be locked by the pin portion 60 to prevent falling. On the contrary, if it is the latter state, when the hydraulic system of the scissor-type hydraulic lifting platform fails and can no longer effectively support each pair of fork arms to remain in an X-cross state with a fixed angle, the two pairs of fork arms will rotate relative to each other at a certain angle, and the spring 70 will tend to push the plug section 61 into the socket 11, and the pin rod portion 60 can lock the two fork arms to prevent them from falling.

[0043] During normal lifting operation, the electromagnetic unit 90 is switched to the power-on state, and the suction force of the electromagnetic disk part 92 on the armature part 91 can drive the radial flange 61 to move toward the inner bottom surface of the countersunk hole 21, so that the spring 70 is further compressed, and finally the plug section 61 is completely removed from the socket 11, releasing the locking state of the two fork arms by the pin rod part 60, so that the two fork arms can freely rotate relative to each other, thereby driving the lifting platform to move up and down in the vertical direction.

[0044] An annular recessed groove 12 may be formed on the end surface of the inner fork arm 10, and the insertion holes 11 are distributed on the inner bottom surface of the annular recessed groove 12. The radial width of the annular recessed groove 12 is not less than the inner diameter of the insertion hole 11, and preferably the radial width of the annular recessed groove 12 is consistent with the inner diameter of the insertion hole 11. This improvement helps to better guide the end of the plug segment 61 to be smoothly and stably inserted into the insertion hole 11.

[0045] In order to prevent the occurrence of a large gap between the paired fork arms due to vibration during operation, the following optimization can be made.

[0046] The inner end side of the pivot 30 extends out of the inner fork arm 10, and the end 31 is matched with the nut 40, and a radially extending pin hole is formed on the end 31, and a pin is fixed in the pin hole. The pin can prevent the nut 40 from moving axially relative to the end 31.

[0047] On the outer end side of the pivot 30, a nut two 50 is correspondingly provided on the end two 32 that extends out of the outer fork arm 20, and a radially extending pin hole is formed on the end two 32. A pin post is fixedly provided in the pin hole. The pin post can prevent the nut two 50 from moving axially relative to the end two 32.

[0048] By means of two nuts (the nut one 40 and the nut two 50), the opposite surfaces of the two fork arms are stably urged to be in close contact, and the gap between the opposite surfaces is stably controlled, which can ensure that the anti-falling locking mechanism composed of the pin rod portion 60, the spring 70, the assembly block 80 and the electromagnetic unit 90 functions stably, and improves the stability and reliability of the anti-falling function.

[0049] An annular sunk groove 51 is formed on the end face of the nut two 50 facing the outer fork arm 20. The radial width of the annular sunk groove 51 is greater than the maximum outer diameter of the assembly block 80, so that a gap is maintained between the outer wall of the end of the assembly block 80 extending into the annular sunk groove 51 and the inner wall of the annular sunk groove 51. The annular sunk groove 51 on the nut two 50 can cover the assembly block 80 and the main body of the electromagnetic unit 90 inside, which can play a protective role, is beneficial to the stable functioning of the electromagnetic unit 90, extends the maintenance duration and reduces the maintenance frequency.

[0050] A tapered through hole 822 is formed on the bottom surface of the cavity 821, so that the tapered surface portion on the housing of the electromagnetic disk portion 91 is in full contact with the inner peripheral surface of the tapered through hole 822, and is firmly fixed to one end side of the block two 82 through the screw cylinder 921.

[0051] The above embodiments are only illustrative of the principles and effects of the present invention, rather than limiting the present invention. There are many aspects of the present invention that can be improved without departing from the overall idea. Those familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A lifting platform anti-falling mechanism, comprising an inner fork arm, an outer fork arm and a pivot; the pivot is matched with a pivot hole provided in the middle of the inner fork arm and a pivot hole provided in the middle of the outer fork arm, so that the inner fork arm and the outer fork arm can rotate relative to each other; characterized in that: It also includes a plurality of pin rod parts, a plurality of springs, a plurality of assembly blocks and a plurality of electromagnetic units that are matched one by one; On the end surface of the inner fork arm facing the outer fork arm, a plurality of insertion holes are alternately arranged around the outer side of the pivot hole; correspondingly, countersunk holes corresponding to and matching the insertion holes are arranged on the outer side of the pivot hole on the outer fork arm, and a threaded through hole is arranged on the inner bottom of the countersunk hole; the number of the insertion holes is an integer multiple of the number of the countersunk holes; The pin rod portion matches the counterbore in a one-to-one correspondence, and includes a plug section formed at one end of the pin rod, a radial flange formed at the middle of the pin rod, and a guide rod section formed at the other end of the pin rod; The radial flange is assembled in the countersunk hole, and the spring is sleeved on the guide rod segment; the two ends of the spring are respectively in contact with the inner bottom surface of the countersunk hole and the end surface of the radial flange, and can push the radial flange to drive the end of the plug segment to be inserted into the countersunk hole; The pin of the pin part can move back and forth linearly relative to the countersunk hole; One end of the assembly block matches the threaded through hole, so that the assembly block is fixedly mounted on the outer fork arm; A cavity is formed on the assembly block, and a through hole communicating with the cavity is formed on a side of the assembly block facing the outer fork arm; the free end of the guide rod segment passes through the through hole and extends into the cavity; The electromagnetic unit is assembled in the cavity, and includes an armature part and an electromagnetic disk part; the armature part is fixedly connected to the guide rod section; the electromagnetic disk part and the armature part are fixedly installed in the cavity relative to each other, and as the electromagnetic disk part switches between the power-on and power-off states, the armature part can move closer to and away from the electromagnetic disk part, and selectively drives the end of the plug section to be moved out of and inserted into the socket.

2. The anti-falling mechanism for a lifting platform according to claim 1, characterized in that: The outer diameter of the radial flange is consistent with the inner diameter of the countersunk hole, so that the pin rod can move back and forth linearly relative to the countersunk hole.

3. The anti-falling mechanism for a lifting platform according to claim 1, characterized in that: The through hole formed on the assembly block and communicating with the mold cavity is a smooth through hole, and the inner diameter of the smooth through hole is consistent with the outer diameter of the guide rod segment.

4. A lifting platform anti-falling mechanism according to any one of claims 1 to 3, characterized in that: An annular recessed groove is formed on the end surface of the inner fork arm and the insertion holes are distributed on the inner bottom surface of the annular recessed groove; the radial width of the annular recessed groove is not less than the inner diameter of the insertion holes.

5. A lifting platform anti-falling mechanism according to any one of claims 1 to 3, characterized in that: The inner end side of the pivot extends out to the end portion outside the inner fork arm, and is matched with a nut, and a radially extending pin hole is formed on the end portion, in which a pin is fixed; the pin can prevent the nut from moving axially relative to the end portion.

6. The anti-falling mechanism for a lifting platform according to claim 5, characterized in that: The outer end side of the pivot extends out to the end part two outside the outer fork arm, and is matched with a nut two and a radially extending pin hole is formed on the end part two, in which a pin column is fixed; the pin column can prevent the nut two from moving axially relative to the end part two.

7. The anti-falling mechanism for a lifting platform according to claim 6, characterized in that: An annular groove is formed on the end surface of the nut 2 facing the outer fork arm; the radial width of the annular groove is greater than the maximum outer diameter of the assembly block, so that a distance is maintained between the outer wall of one end of the assembly block extending into the annular groove and the inner wall of the annular groove.

8. A lifting platform anti-falling mechanism according to any one of claims 1 to 3, characterized in that: The outer end side of the pivot extends out to the end part two outside the outer fork arm, and is matched with a nut two and a radially extending pin hole is formed on the end part two, in which a pin column is fixed; the pin column can prevent the nut two from moving axially relative to the end part two.

9. The anti-falling mechanism for a lifting platform according to claim 8, characterized in that: An annular groove is formed on the end surface of the nut 2 facing the outer fork arm; the radial width of the annular groove is greater than the maximum outer diameter of the assembly block, so that a distance is maintained between the outer wall of one end of the assembly block extending into the annular groove and the inner wall of the annular groove.

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