A fatigue test device for parking brake of forklift

Abstract

The present invention belongs to the technical field of parking brakes, and specifically relates to a fatigue test device for parking brakes for forklifts. It includes a brake fixing mechanism and a cylinder mechanism; the brake fixing mechanism is used to install the parking brake and the wheel hub, the cylinder mechanism includes a cylinder bottom plate and a cylinder, one end of the cable is fixedly connected through a connecting seat and the protruding end of the piston rod, and a section of the cable corresponding to the cylinder bottom plate is horizontally arranged above the cylinder bottom plate through a support plate, and is coaxially arranged with the piston rod; during the test, the piston is controlled to reciprocate, driving the cable head of the cable to reciprocate, and a fatigue test is performed. Therefore, the present invention matches the wheel hub with the brake to reflect the influence of the wheel hub on the brake according to the actual situation. The brake fixing mechanism can fix the brake and the wheel hub, and there is no need to carry the whole vehicle for testing; the force direction of the cable is consistent, and the movement of the cable drives the internal mechanism of the parking brake to move, realizing fatigue testing and completing product reliability verification.

Description

Technical Field

[0001] The invention belongs to the technical field of parking brakes, and in particular relates to a fatigue test device for a parking brake used in a forklift. Background Art

[0002] Forklift parking brakes are an important component, and their performance is of great significance to the safety of forklift use. At present, in the forklift industry, brake performance tests can be carried out according to international, domestic, industry or internal enterprise standards. For example, GB / T 18849-2011 / ISO 6292:2008 "Performance and Component Strength of Powered Industrial Vehicle Brakes", JB / T13695-2019 "Industrial Vehicle Brakes", etc. However, most of these standards carry complete vehicles for brake tests, such as parking brake performance, etc., and the fatigue durability performance test of forklift parking brakes is rarely involved.

[0003] According to the operating standards, after the forklift stops, its parking brake must be activated to ensure that the forklift is completely stationary. If the forklift parking brake fails, there will be huge safety hazards. Therefore, it is necessary to design a corresponding test device to conduct relevant tests on the fatigue performance of the forklift parking brake and study its fatigue characteristics. Summary of the invention

[0004] In view of the above existing situation, the present invention provides a fatigue test device for a parking brake for a forklift, which has a simple structure and is easy to manufacture and test and disassemble, thereby avoiding the need to carry a whole vehicle for testing and reducing the test time.

[0005] The specific technical scheme is as follows: A fatigue test device for a parking brake for a forklift, comprising a brake fixing mechanism and a cylinder mechanism;

[0006] The brake fixing mechanism comprises a fixing base plate 11, a brake mounting plate 12 and a wheel hub mounting plate 13, wherein the brake mounting plate 12 and the wheel hub mounting plate 13 are arranged upright and spaced apart and parallel on the fixing base plate 11;

[0007] The cylinder mechanism includes a cylinder bottom plate 21 and a cylinder 22, and the cylinder 22 is horizontally fixed above the cylinder bottom plate 21 through a pair of L-shaped support plates 23;

[0008] One end of the cable 31 is fixedly connected to the extended end of the piston rod through a connecting seat, and a section of the cable corresponding to the cylinder bottom plate 21 is horizontally arranged above the cylinder bottom plate 21 through a supporting plate 24 and is coaxially arranged with the piston rod;

[0009] The parking brake 32 and the wheel hub 33 are installed and arranged between the brake mounting plate 12 and the wheel hub mounting plate 13, and one end surface of the parking brake 32 is fixedly connected to the brake mounting plate 12 through the backing plate 14, and one end surface of the wheel hub 33 is fixedly connected to the wheel hub mounting plate 13;

[0010] During the test, the piston is controlled to reciprocate, thereby driving the cable head of the cable 31 to reciprocate, and a fatigue test is performed.

[0011] Further, the connecting seat includes an inverted U-shaped connecting block 25 and an inverted T-shaped cable fixing block 26, a threaded sleeve 251 is horizontally arranged at the U-shaped bottom of the connecting block 25, the threaded sleeve 251 is threadedly fixedly connected to the extended end of the piston rod, and the T-shaped vertical portion of the cable fixing block 26 is arranged at the U-shaped opening of the connecting block 25 and is locked and fixed by bolts passing through;

[0012] An end cap 311 is provided at one end of the cable head of the cable 31, and the outer cylindrical surface of the end cap 311 is a step surface. An end cap groove 261 is provided on the upper part of the T-shaped horizontal part of the cable fixing block 26, and the end cap groove 261 includes a rectangular groove. A vertical through hole is provided at the end of the rectangular groove corresponding to one end of the connecting block 25. The end cap 311 is arranged in the end cap groove 261, and the high-step surface of the outer cylindrical surface of the end cap 311 is correspondingly located in the vertical through hole, so that when the cable 31 is pulled horizontally, one end of the cable head of the cable 31 is clamped in the end cap groove 261 through the end cap 311.

[0013] Furthermore, the upper end notch of the end cap slot 261 is sealed by a horizontally arranged anti-detachment cover plate 262 to prevent the end cap 311 from detaching from the end cap slot 261 from above.

[0014] Furthermore, the support plate 24 is arranged upright on the cylinder bottom plate 21, and a U-shaped groove is provided at the upper end of the support plate 24 corresponding to the axial direction of the piston rod;

[0015] A guide sleeve 312 with an external thread is sleeved on the cable 31, and the guide sleeve 312 passes through the U-shaped slot on the support plate 24, and the support plate 24 is clamped from both sides by a pair of nuts 313, and a gasket 314 is provided between each nut and the corresponding side of the support plate 24, so that the guide sleeve 312 supports the cable 31 to be arranged horizontally above the cylinder bottom plate 21.

[0016] Furthermore, the wheel hub mounting plate 13 is an L-shaped plate, the vertical portion of the L-shape is fixedly connected to one side end face of the wheel hub 33, the horizontal portion of the L-shape is fixedly connected to the fixed base plate 11 by bolts, and a reinforcing rib plate 15 is provided at the right angle of the L-shape; a waist-shaped hole is provided in the L-shaped horizontal portion of the mounting plate 13, and the fastening position of the bolts and the waist-shaped hole is adjusted to adjust the spacing distance between the brake mounting plate 12 and the wheel hub mounting plate 13.

[0017] The beneficial technical effects of the invention are as follows: At present, in the forklift industry, various parameters are mostly tested on brake test benches. For fatigue durability tests of brakes, the whole vehicle is usually carried out for testing. The whole vehicle test and the process of disassembling and assembling the brake will cause a waste of test time and manpower. In addition, during the whole vehicle test, the parking brake is used less frequently, resulting in inaccurate judgment of the fatigue durability of the parking brake through the whole vehicle test results. In addition, with the continuous increase in the types of forklifts, the parallel development of new products, and the changes in the structure of the internal components of the brake, it has become very necessary to carry out fatigue durability tests on the brake in a targeted manner.

[0018] The beneficial technical effects of the present invention are specifically manifested as follows:

[0019] (1) The fatigue test device of the present invention comprises a brake fixing mechanism and a cylinder mechanism; the brake fixing mechanism is used to install the parking brake and the wheel hub, the cylinder mechanism comprises a cylinder bottom plate and a cylinder, one end of the cable is fixedly connected to the extended end of the piston rod through a connecting seat, and a section of the cable corresponding to the cylinder bottom plate is horizontally arranged above the cylinder bottom plate through a supporting plate and is coaxially arranged with the piston rod; the piston is controlled to reciprocate to drive the cable to reciprocate to perform a fatigue test;

[0020] Therefore, the pulled section of the cable of the present invention is kept horizontal, so that the force direction of the cable remains consistent, and the movement of the cable drives the internal mechanism of the parking brake to operate, thereby realizing the fatigue test of the parking brake and completing the reliability verification of the product;

[0021] (2) In order to simulate the actual working condition of the brake on the vehicle, the present invention matches the wheel hub with the brake to reflect the influence of the wheel hub on the brake according to the actual situation. The brake fixing mechanism can fix the brake and the wheel hub, and there is no need to carry the whole vehicle for testing;

[0022] (3) According to the design value of the strength of the brake components, such as the force that the cable can withstand during use, a cylinder with a suitable cylinder diameter can be selected and the intake pressure can be adjusted to ensure that the test value is the same as the design value; the spacing between the brake mounting plate and the wheel hub mounting plate can be adjusted to meet the fatigue test requirements of different types of brakes and wheels. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the fatigue testing device of the present invention.

[0024] Figure 2 It is a structural schematic diagram of the connecting block of the present invention.

[0025] Figure 3 It is a schematic structural diagram of the cable fixing block of the present invention.

[0026] Figure 4 It is a schematic diagram of the structure of the cable of the present invention.

[0027] Figure 5 This is a diagram showing the use status of the fatigue testing device of the present invention.

[0028] Among them: 11 fixed base plate, 12 brake mounting plate, 13 wheel hub mounting plate, 14 pad, 15 reinforcing rib plate, 21 cylinder base plate, 22 cylinder, 23 a pair of L-shaped support plates, 24 support plate, 25 connecting block, 251 threaded sleeve, 26 cable fixing block, 261 end cap groove, 262 anti-drop cover plate, 31 cable, 311 end cap, 312 connecting pipe sleeve, 313 a pair of nuts, 32 parking brake, 33 wheel hub. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not intended to limit the present invention. Example

[0030] See Figure 1 , a fatigue test device for a parking brake for a forklift, comprising a brake fixing mechanism and a cylinder mechanism;

[0031] The brake fixing mechanism comprises a fixing base plate 11, a brake mounting plate 12 and a wheel hub mounting plate 13, wherein the brake mounting plate 12 and the wheel hub mounting plate 13 are arranged upright and spaced apart and parallel on the fixing base plate 11;

[0032] The cylinder mechanism includes a cylinder bottom plate 21 and a cylinder 22, and the cylinder 22 is horizontally fixed above the cylinder bottom plate 21 through a pair of L-shaped support plates 23;

[0033] One end of the cable 31 is fixedly connected to the extended end of the piston rod through a connecting seat, and a section of the cable corresponding to the cylinder bottom plate 21 is horizontally arranged above the cylinder bottom plate 21 through a supporting plate 24 and is coaxially arranged with the piston rod;

[0034] The parking brake 32 and the wheel hub 33 are installed and arranged between the brake mounting plate 12 and the wheel hub mounting plate 13, and one end surface of the parking brake 32 is fixedly connected to the brake mounting plate 12 through the backing plate 14, and one end surface of the wheel hub 33 is fixedly connected to the wheel hub mounting plate 13;

[0035] During the test, the piston is controlled to reciprocate, thereby driving the cable head of the cable 31 to reciprocate, and a fatigue test is performed.

[0036] See Figure 2 and 3The connecting seat includes an inverted U-shaped connecting block 25 and an inverted T-shaped cable fixing block 26. A threaded sleeve 251 is horizontally arranged at the U-shaped bottom of the connecting block 25. The threaded sleeve 251 is threadedly fixedly connected to the extended end of the piston rod. The T-shaped vertical portion of the cable fixing block 26 is arranged at the U-shaped opening of the connecting block 25 and is locked and fixed by bolts.

[0037] An end cap 311 is provided at one end of the cable head of the cable 31, and the outer cylindrical surface of the end cap 311 is a step surface. An end cap groove 261 is provided on the upper part of the T-shaped horizontal part of the cable fixing block 26, and the end cap groove 261 includes a rectangular groove. A vertical through hole is provided at the end of the rectangular groove corresponding to one end of the connecting block 25. The end cap 311 is arranged in the end cap groove 261, and the high-step surface of the outer cylindrical surface of the end cap 311 is correspondingly located in the vertical through hole, so that when the cable 31 is pulled horizontally, one end of the cable head of the cable 31 is clamped in the end cap groove 261 through the end cap 311.

[0038] The upper end notch of the end cap slot 261 is sealed by a horizontally arranged anti-detachment cover plate 262 to prevent the end cap 311 from detaching from the end cap slot 261 from above.

[0039] The support plate 24 is vertically arranged on the cylinder bottom plate 21, and a U-shaped groove is formed at the upper end of the support plate 24 corresponding to the axial direction of the piston rod;

[0040] A guide sleeve 312 with an external thread is sleeved on the cable 31, and the guide sleeve 312 passes through the U-shaped slot on the support plate 24, and is clamped on both sides of the support plate 24 by a pair of nuts 313 and gaskets 314, and a gasket 314 is provided between each nut and the corresponding side of the support plate (24), so that the guide sleeve 312 supports the cable 31 and is arranged horizontally above the cylinder bottom plate 21.

[0041] The hub mounting plate 13 is an L-shaped plate, the vertical portion of the L-shape is fixedly connected to the axial end face of the hub 33, the horizontal portion of the L-shape is fixedly connected to the fixed bottom plate 11 by bolts, and a reinforcing rib plate 15 is provided at the right angle of the L-shape. A waist-shaped hole is provided in the horizontal portion of the L-shape, which is used to adjust the matching distance between the parking brake 32 and the hub 33, and can be applied to the matching fatigue test of different types of brakes and hubs.

[0042] See Figure 5Before the test, first put the bolts into the ground groove and pass them out from the bottom of the fixed base plate 11 to complete the fixing of the fixed base plate 11 and the fastening of the wheel hub mounting plate 13. Then, fix one end face of the parking brake 32 to the brake mounting plate 12 through the backing plate 14, and fix one end face of the wheel hub 33 to the wheel hub mounting plate 13. After adjusting the matching distance between the parking brake 32 and the wheel hub 33 through the waist-shaped holes on the horizontal plate of the wheel hub fixing plate 13, fix the wheel hub mounting plate 13 on the fixed base plate 11.

[0043] One end of the cable 31 is engaged in the end cap groove 261 through the end cap 311, and a section of the cable 31 located above the cylinder bottom plate 21 is fixed in the horizontal direction by the support plate 24. During the test, the action of the reversing valve connected to the double-acting cylinder 22 is controlled by the time relay, thereby controlling the reciprocating motion of the piston rod, thereby driving one end of the cable 31 to reciprocate, simulating the action of the parking brake during parking, thereby realizing the parking brake fatigue test and completing the reliability verification of the product.

[0044] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fatigue test device for a parking brake for a forklift, characterized in that: It includes a brake fixing mechanism and a cylinder mechanism; The brake fixing mechanism comprises a fixing base plate (11), a brake mounting plate (12) and a wheel hub mounting plate (13), wherein the brake mounting plate (12) and the wheel hub mounting plate (13) are arranged upright and spaced apart in parallel on the fixing base plate (11); The cylinder mechanism comprises a cylinder bottom plate (21) and a cylinder (22), wherein the cylinder (22) is horizontally fixed above the cylinder bottom plate (21) via a pair of L-shaped support plates (23); One end of the cable (31) is fixedly connected to the extended end of the piston rod via a connecting seat, and a section of the cable corresponding to the cylinder bottom plate (21) is horizontally arranged above the cylinder bottom plate (21) via a supporting plate (24) and is coaxially arranged with the piston rod; The parking brake (32) and the wheel hub (33) are installed and arranged between the brake mounting plate (12) and the wheel hub mounting plate (13), and one end surface of the parking brake (32) is fixedly connected to the brake mounting plate (12) via a backing plate (14), and one end surface of the wheel hub (33) is fixedly connected to the wheel hub mounting plate (13); The connecting seat comprises an inverted U-shaped connecting block (25) and an inverted T-shaped cable fixing block (26); a threaded sleeve (251) is horizontally arranged at the U-shaped bottom of the connecting block (25); the threaded sleeve (251) is threadedly fixedly connected to the protruding end of the piston rod; the T-shaped vertical portion of the cable fixing block (26) is arranged at the U-shaped opening of the connecting block (25) and is penetrated and locked by bolts; An end cap (311) is provided at one end of the cable head of the cable (31), and the outer cylindrical surface of the end cap (311) is a stepped surface. An end cap groove (261) is provided at the upper portion of the T-shaped horizontal portion of the cable fixing block (26), and the end cap groove (261) comprises a rectangular groove. A vertical through hole is provided at the end of the rectangular groove corresponding to one end of the connecting block (25). The end cap (311) is arranged in the end cap groove (261), and the high-stepped surface of the outer cylindrical surface of the end cap (311) is correspondingly located in the vertical through hole, so that when the cable (31) is pulled horizontally, one end of the cable head of the cable (31) is clamped in the end cap groove (261) through the end cap (311); The support plate (24) is arranged upright on the cylinder bottom plate (21), and a U-shaped groove is provided at the upper end of the support plate (24) corresponding to the axial direction of the piston rod; A guide sleeve (312) with an external thread is sleeved on the cable (31), the guide sleeve (312) passes through a U-shaped slot on the support plate (24), and is clamped on both sides of the support plate (24) by a pair of nuts (313), and a gasket (314) is provided between each nut and the corresponding side surface of the support plate (24), so that the guide sleeve (312) supports the cable (31) and is arranged horizontally above the cylinder bottom plate (21); During the test, the piston is controlled to reciprocate, thereby driving the cable head of the cable (31) to reciprocate, and a fatigue test is performed.

2. A fatigue test device for a parking brake for a forklift according to claim 1, characterized in that: The upper end notch of the end cap slot (261) is sealed by a horizontally arranged anti-detachment cover plate (262) to prevent the end cap (311) from detaching from the end cap slot (261) from above.

3. The fatigue test device for a parking brake for a forklift according to claim 1, characterized in that: The wheel hub mounting plate (13) is an L-shaped plate, the vertical portion of the L-shape is fixedly connected to one end face of the wheel hub (33), the horizontal portion of the L-shape is fixedly connected to the fixed base plate (11) by bolts, and a reinforcing rib plate (15) is provided at the right angle of the L-shape; a waist-shaped hole is provided in the L-shaped horizontal portion of the mounting plate (13), and the spacing distance between the brake mounting plate (12) and the wheel hub mounting plate (13) is adjusted by adjusting the fastening position of the bolts and the waist-shaped hole.

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