CN103359623A - Anti-falling device used for lifting device of vehicle box framework - Google Patents

Abstract

The invention relates to a fall prevention device used on a vehicle box frame lifting device, comprising a first braking mechanism arranged at the connection position between the power chain of the vehicle box frame lifting device and the load-bearing suspender of the vehicle box frame , the first braking mechanism includes a first shift fork, a first braking ratchet, a first rack and a pulling component. The first shift fork is hinged on the vehicle box frame, which has a first fork and a second fork, and the first fork is connected to the load-bearing suspension rod; one end of the first brake ratchet is hinged on the vehicle box frame , the other end corresponds to the second fork; the first rack is arranged on the fixed stand; the pulling part pulls the second fork to rotate when the power chain breaks, so that the second fork pushes the other of the first braking ratchet One end engages with the first rack. The invention can prevent the frame from falling when making the vehicle box frame.

Description

Fall arrest device for vehicle box frame lifting device

technical field

The invention relates to a braking mechanism in the vehicle manufacturing industry, in particular to an anti-falling device used on a vehicle box frame lifting device.

Background technique

When making the vehicle box frame, it is necessary to lift the frame. At present, the commonly used lifting method is to use a hydraulic cylinder to pull the chain to lift the frame. Referring to Figure 1, the frame 20 is driven up (or down) by the power chain 12. During the up (down) process The lower section 132 of the driven chain 13 becomes longer (shorter), and then the upper section 131 of the driven chain 13 becomes shorter (longer), so that the whole frame 20 rises (falls) smoothly. There is following problem in adopting above-mentioned lifting method: all can cause frame 20 to fall and cause personal injury accident as chain (whether it is power chain 12 or driven chain 13) breaks during lifting process.

Therefore, it is necessary to develop a kind of anti-falling device used on the lifting device of the vehicle box frame to avoid the frame falling problem when making the vehicle box frame.

Contents of the invention

The technical problem to be solved by the present invention is aimed at the problem that in the existing vehicle manufacturing industry, the vehicle box frame is easy to fall when the frame is lifted by pulling the chain through the hydraulic cylinder, and a lifting device for the vehicle box frame is provided. fall arrest device.

In order to solve the above-mentioned technical problems, the present invention provides a kind of anti-falling device used on the vehicle box frame lifting device, the vehicle box frame lifting device is used to lift the vehicle box frame, which includes a fixed stand, a power chain and Driven chain, the vehicle box frame is provided with a load-bearing suspender and a drive sprocket, and the drive sprocket includes a first drive sprocket on the same side as the load-bearing suspender and a first transmission sprocket located on the same side as the load-bearing suspender For the second transmission sprocket on the opposite side, one end of the power chain is connected to the load-bearing suspender, and the other end is wound on a hydraulic cylinder arranged on the fixed platform, and the driven chain passes through the first A transmission sprocket and the second transmission sprocket form a first load-bearing section between the second transmission sprocket and the fixed platform, and the fall prevention device includes a power chain and a load-bearing suspender A first braking mechanism at the connection position, said first braking mechanism further comprising:

A first shift fork, hinged on the vehicle box frame, has a first fork and a second fork, and the first fork is connected to the load-bearing suspender;

a first braking ratchet, one end of which is hinged on the vehicle box frame, and the other end corresponding to the second fork;

a first rack disposed on the fixed stand; and

The pulling part pulls the second fork to rotate when the power chain breaks, so that the second fork pushes the other end of the first braking ratchet to engage with the first rack.

The above-mentioned anti-fall device, wherein the anti-fall device includes a second braking mechanism arranged on the first load-bearing section, and the second braking mechanism further includes:

The second shift fork is hinged on the vehicle box frame, and has a third fork and a fourth fork, and the third fork is pressed against the first load-bearing section;

the second brake ratchet, one end of which is hinged on the vehicle box frame, and the other end corresponding to the fourth fork;

a second rack disposed on the fixed stand; and

The pushing part pushes the third fork to rotate when the driven chain breaks, so that the fourth fork pushes the other end of the second braking ratchet to engage with the second rack.

The above-mentioned anti-falling device, wherein, the vehicle box frame has a hanging part, and a through hole is provided on the hanging part; the load-bearing suspender includes a head, a first rod part and a second Rod part, the diameter of the head part is larger than the first rod part, the diameter of the first rod part is larger than the second rod part; the pushing part is a spring, and the spring is sleeved on the first rod part , and one end of the spring abuts against the head, and the other end abuts against a surface of the hanging part; the second rod fits with the through hole and can Sliding, the end of the second rod away from the first rod is connected with the power chain.

The above-mentioned anti-falling device, wherein, a first hinge ear protrudes from the other surface of the suspension part, and a pin shaft passes through the first hinge ear and the first shift fork to make the first shift The fork is hinged to the first hinged ear, said other surface being the surface opposite said surface abutting against the spring.

In the above-mentioned anti-fall device, wherein, the vehicle box frame has a first installation part, and one end of the first braking ratchet is hinged on the first installation part.

The above-mentioned anti-falling device, wherein, the first mounting part is further provided with a first guide wheel, and the first rack includes a guide part corresponding to the first guide wheel, and a guide part corresponding to the first brake. Helical teeth for ratchet engagement.

In the above-mentioned anti-fall device, wherein, the third fork is pressed against the first load-bearing section by a pressure roller disposed on an end thereof.

The above-mentioned anti-falling device, wherein, the vehicle box frame has a second hinge ear, and a pin shaft passes through the second hinge ear and the second shift fork so that the second shift fork is hinged to the second shift fork. Hinged ears.

In the above-mentioned anti-falling device, wherein, the vehicle box frame has a second mounting portion, and one end of the second brake ratchet is hinged on the second mounting portion.

The above-mentioned anti-falling device, wherein, the second mounting part is further provided with a second guide wheel, and the second rack includes a guide part corresponding to the second guide wheel, and a guide part corresponding to the second brake. Helical teeth for ratchet engagement.

In the above-mentioned anti-falling device, wherein, the pushing member includes a spring setting part and a spring wound on the spring setting part, one end of the spring setting part is set on the second mounting part, and the other end is set on the second mounting part. above the third fork.

The beneficial effect of the present invention is that, through the braking action of the first braking mechanism or/and the second braking mechanism, it is possible to well avoid the frame from falling when making the vehicle box frame, and to ensure the personal safety of the workers well. . Moreover, the first braking mechanism and the second braking mechanism are sensitive in response, and the action braking is reliable when the chain is abnormal, and it also has the advantages of convenient maintenance.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is a schematic structural diagram of a vehicle box frame lifting device of the prior art;

Fig. 2 is a perspective view of the first braking mechanism of the fall arrest device of the present invention;

Fig. 3 is the front view of the first braking mechanism in Fig. 2;

Fig. 4 is the B-B view among Fig. 3;

5 is a perspective view of a second braking mechanism of the fall arrester of the present invention;

Fig. 6 is the front view of the second braking mechanism in Fig. 5;

Fig. 7 is a C-C view in Fig. 6 .

Among them, reference signs

10-Vehicle box frame lifting device

11-fixed stand

12 - power chain

13- driven chain

131-upper section (the first load-bearing section)

132-lower paragraph

20-Vehicle box frame

21-Load-bearing boom

211-Head

212-first pole

213-Second rod

22-Drive sprocket

221-First drive sprocket

222-Second drive sprocket

23-Hanging part

231-Surface

24 - First hinged ear

241-pin shaft

25-The first installation department

26-The first guide wheel

27 - Second hinged ear

271-pin shaft

28-Second Installation Department

29-Second guide wheel

30 - The first braking mechanism

31-First shift fork

311 - first fork

312 - second fork

32-The first brake ratchet

33-First rack

331-guide

332-Helical gear

34 - pull parts

40-Second braking mechanism

41-Second shift fork

411-Third Fork

442-Fourth Fork

42-Second brake ratchet

43-Second rack

431-guide

432-Helical gear

44-Push parts

441-spring set piece

442-spring

45-press wheel

Detailed ways

The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims of the present invention.

The anti-fall device of the present invention is mainly used on the vehicle box frame lifting device. As shown in Figure 1, the vehicle box frame lifting device 10 is used for lifting the vehicle box frame 20, which includes a fixed stand 11, a power chain 12 and Driven chain 13, vehicle case frame 20 is provided with load-bearing suspender 21 (not shown in Fig. 1) and transmission sprocket 22, and transmission sprocket 22 comprises the first transmission sprocket that is positioned at the same side with load-bearing suspender 21 221 and the second transmission sprocket 222 positioned on the opposite side with the load-bearing boom 21, one end of the power chain 12 is connected with the load-bearing boom 21, and the other end is wound around a hydraulic cylinder (hydraulic cylinder) arranged on the fixed stand 11 Not shown in the figure), the driven chain 13 passes through the first transmission sprocket 221 and the second transmission sprocket 222 and forms a first load-bearing section 131 between the second transmission sprocket 222 and the fixed platform 11 . When lifting the vehicle box frame 20, it is driven by the power chain 12 to rise (or fall), and the lower section 132 of the driven chain 13 becomes longer (shorter) during the rising (falling) process, so that the upper section 131 ( That is, the first load-bearing section 131) becomes shorter (longer), so that the vehicle box frame 20 as a whole rises (falls) smoothly. In view of the fact that the above-mentioned vehicle box frame lifting device is in the process of lifting the vehicle box frame, if the chain (whether it is the power chain 12 or the driven chain 13) breaks, it will cause the vehicle box frame to fall and cause personal injury accidents. Provide the following fall arrest devices.

In order to avoid the damage caused by the breakage of the power chain 12 , a first braking mechanism 30 is provided at the connection position between the power chain 12 and the load-bearing suspender 21 . Referring to FIG. 2 , FIG. 3 and FIG. 4 , the first braking mechanism 30 includes a first shift fork 31 , a first braking ratchet 32 , a first rack 33 and a pulling member 34 . The first shift fork 31 is hinged on the vehicle box frame 20, and the first shift fork 31 has a first fork 311 and a second fork 312, wherein the first fork 311 is connected with the load-bearing suspension rod 21; One end of a brake ratchet 32 is hinged on the vehicle box frame 20, and the other end corresponds to the second fork 312; the first tooth bar 33 is arranged on the fixed stand 11; the pulling part 34 pulls the second fork when the power chain 12 is broken The fork 312 rotates so that the second fork 312 pushes the other end of the first brake ratchet 32 to engage with the first rack 33, where the other end is opposite to the first brake ratchet 32 and the vehicle case. In terms of the hinged position of the frame 20.

Specifically, the vehicle box frame 20 has a hanging portion 23, and a through hole (not marked in the figure) is provided on the hanging portion 23, and the load-bearing suspender 21 includes a head 211, a first rod portion 212 and A second rod part 213, the diameter of the head part 211 is larger than the first rod part 212, and the diameter of the first rod part 212 is larger than the second rod part 213; the pushing part 34 is preferably a spring, and the spring is sleeved on the first rod part 212 On, and one end of the spring abuts against the head 211, and the other end abuts against the surface 231 of the suspension part 23; the second rod part 213 fits with the through hole and can slide in the through hole, and the second rod part 213 The end far away from the first rod portion 212 is connected with the power chain 12 . A first hinged ear 24 protrudes from the other surface of the hanging part 23, and a pin shaft 2411 passes through the first hinged ear 24 and the first shift fork 31 so that the first shift fork is hinged to the first hinged ear. The other surface here is the surface opposite to the surface 231 abutting against the spring.

In addition, in order to facilitate the installation of the first brake ratchet 32 , the vehicle case frame 20 has a first installation portion 25 , and one end of the first brake ratchet 32 is hinged on the first installation portion 25 . In addition, in order to make the first braking ratchet 32 mesh well with the first rack 33 , the first mounting part 25 is also provided with a first guide wheel 26 , and the first rack 33 includes a wheel corresponding to the first guide wheel 26 . The guide portion 331 and the helical tooth portion 332 meshing with the first brake ratchet 32 .

2, the braking principle of the first braking mechanism 30 is: under normal circumstances, the upper end of the load-bearing suspension bar 21 is connected to the power chain 12, and the lower end is pressed on the spring 34. pressure), so the spring is compressed, the lower end of the second fork portion 312 of the first shift fork 31 is at the lowest position, and the first brake ratchet 32 is sagging by its own weight and does not contact the first rack 33. When the power chain 12 breaks, there is no tension on the power chain 12, the spring 34 pushes down the load-bearing suspension bar 21, the load-bearing suspension bar 21 moves downward, and the second fork 32 of the first shift fork 31 stirs up the first brake. The ratchet 32 , the first brake ratchet 32 is inserted into the helical tooth portion 332 of the first rack 33 , so as to function as a brake.

Further, considering that the vehicle box frame 20 is relatively heavy overall, in order to achieve a better braking effect, a second braking mechanism 40 is provided on the first load-bearing section 131 . Referring to FIG. 5 , FIG. 6 and FIG. 7 , the second brake mechanism 40 includes a second shift fork 41 , a second brake ratchet 42 , a second rack 43 and a push member 44 . The second shift fork 41 is hinged on the vehicle box frame 20, the second shift fork 41 has a third fork 411 and a fourth fork 412, the third fork 411 is pressed against the first bearing section 131; One end of two brake ratchets 42 is hinged on the vehicle box frame 20, and the other end corresponds to the fourth fork 412; the second tooth bar 43 is arranged on the fixed stand 11; The third fork 411 rotates so that the fourth fork 412 pushes the other end of the second braking ratchet 42 to engage with the second rack 43, where the other end is opposite to the second braking ratchet 42 and the vehicle. In terms of the hinged position of the box frame 20.

Specifically, the third fork 411 is pressed against the first load-bearing section 131 by a pressing wheel 45 disposed on an end thereof. The vehicle box frame 20 has a second hinge ear 27 , and a pin shaft 271 passes through the second hinge ear 27 and the second shift fork 41 so that the second shift fork 41 is hinged to the second hinge ear 27 .

In order to facilitate the installation of the second brake ratchet 42 , the vehicle box frame 20 has a second installation portion 28 , and one end of the second brake ratchet 42 is hinged on the second installation portion 28 . In addition, in order to make the second braking ratchet 42 mesh well with the second rack 43 , the second mounting part 28 is also provided with a second guide wheel 29 , and the second rack 43 includes a wheel corresponding to the second guide wheel 29 . The guide portion 431 and the helical tooth portion 432 meshing with the second braking ratchet 42 .

Preferably, the pushing member 44 includes a spring setting part 441 and a spring 442 wound on the spring setting part 441 , one end of the spring setting part 441 is set on the second mounting part 28 , and the other end is set on the third fork part 411 .

5, the braking principle of the second brake mechanism 40 is: under normal circumstances, the pressure roller 45 is pressed on the first load-bearing section 131 of the driven chain 13, because the driven chain 13 bears a large pulling force (much greater than The pressure of the spring 442), so the spring 442 is compressed, the lower end of the fourth fork 412 of the second shift fork 41 is at the lowest position, and the second braking ratchet 42 is drooped by its own weight and does not contact the second rack 43. When the driven chain 13 breaks, there is no pulling force on the driven chain 13, and the spring 442 pushes the third fork 411 to the right, and the fourth fork 412 of the second shift fork 41 lifts up the second brake ratchet 42, The second braking ratchet 42 is inserted into the helical tooth portion 432 of the second rack 43 to play a role of braking.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (11)

1. A fall prevention device for a vehicle box frame lifting device, the vehicle box frame lifting device is used for lifting the vehicle box frame, which includes a fixed stand, a power chain and a driven chain, and the vehicle The box frame is provided with a load-bearing suspender and a transmission sprocket, and the transmission sprocket includes a first transmission sprocket on the same side as the load-bearing suspender and a second transmission chain on the opposite side from the load-bearing suspender One end of the power chain is connected with the load-bearing suspender, and the other end is wound on a hydraulic cylinder arranged on a fixed platform, and the driven chain passes through the first transmission sprocket and the The second transmission sprocket forms a first load-bearing section between the second transmission sprocket and the fixed platform, and it is characterized in that the anti-falling device comprises a The first brake mechanism, the first brake mechanism also includes: A first shift fork, hinged on the vehicle box frame, has a first fork and a second fork, and the first fork is connected to the load-bearing suspender; a first braking ratchet, one end of which is hinged to the vehicle box frame, and the other end corresponding to the second fork; a first rack disposed on the fixed stand; and The pulling part pulls the second fork to rotate when the power chain breaks, so that the second fork pushes the other end of the first braking ratchet to engage with the first rack. 2. The anti-fall device according to claim 1, wherein the anti-fall device comprises a second braking mechanism arranged on the first load-bearing section, and the second braking mechanism further comprises: The second shift fork is hinged on the vehicle box frame, and has a third fork and a fourth fork, and the third fork is pressed against the first load-bearing section; the second brake ratchet, one end of which is hinged on the vehicle box frame, and the other end corresponding to the fourth fork; a second rack disposed on the fixed stand; and The pushing part pushes the third fork to rotate when the driven chain breaks, so that the fourth fork pushes the other end of the second braking ratchet to engage with the second rack. 3. The anti-falling device according to claim 1, wherein the vehicle box frame has a hanging portion, and the hanging portion is provided with a through hole; the load-bearing suspender includes a head, A first rod part and a second rod part, the diameter of the head part is larger than the first rod part, and the diameter of the first rod part is larger than the second rod part; the pushing part is a spring, so The spring is sheathed on the first rod, and one end of the spring abuts against the head, and the other end abuts against a surface of the hanging part; the second rod and the through hole Fitting and being able to slide in the through hole, the end of the second rod part far away from the first rod part is connected with the power chain. 4. The anti-falling device according to claim 3, wherein a first hinged ear protrudes from the other surface of the hanging part, and a pin passes through the first hinged ear and the first hinged ear. The first shift fork makes the first shift fork hinged to the first hinge ear, and the other surface is the surface opposite to the surface against the spring. 5 . The anti-fall device according to claim 4 , wherein the vehicle box frame has a first mounting portion, and one end of the first brake ratchet is hinged on the first mounting portion. 6. The anti-fall device according to claim 5, wherein a first guide wheel is further provided on the first installation part, and the first rack includes a guide part corresponding to the first guide wheel , and a helical tooth portion meshing with the first braking ratchet. 7. The fall arresting device according to claim 2, characterized in that, the third fork is pressed against the first load-bearing section by a pressure roller disposed on an end thereof. 8. The anti-fall device according to claim 2, wherein the vehicle box frame has a second hinged ear, and a pin shaft passes through the second hinged ear and the second shift fork to The second shift fork is hinged to the second hinged ear. 9 . The fall prevention device according to claim 2 , wherein the vehicle box frame has a second mounting portion, and one end of the second braking ratchet is hinged on the second mounting portion. 10 . 10. The anti-fall device according to claim 9, wherein a second guide wheel is further provided on the second installation part, and the second rack includes a guide part corresponding to the second guide wheel , and a helical tooth portion meshing with the second braking ratchet. 11. The anti-fall device according to claim 9, wherein the pushing member comprises a spring setter and a spring wound on the spring setter, one end of the spring setter is set on the second The other end is arranged on the third fork.

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