Test system for fork form and location tolerance and load displacement detection

Abstract

The invention discloses a test system for fork form and location tolerance and load displacement detection in the technical field of forklift fork measurement. The testing system comprises a supporting mechanism, a traction mechanism and a mounting base, a measuring mechanism is arranged on one side of the mounting base, a measuring frame is arranged on the supporting mechanism, and the measuring mechanism comprises a support hinged to one side of the mounting base and a testing wheel arranged at the suspension end of the support. The angle sensor is used for detecting the swing angle of the support, the rotating speed sensor is used for detecting the rotating speed of the test wheel, and an elastic force application part is arranged between the support and the mounting seat. The mounting base is moved through the traction mechanism, the test wheel is tightly attached to the fork, form and location tolerance detection is achieved by detecting the swing angle change of the support, and when the fork load displacement is detected, the test wheel is tightly attached to the measuring frame and the fork moves up and down, the rotation speed change of the test wheel is detected through the rotation speed sensor, so that load displacement detection is achieved, and the detection process is optimized. The detection precision is improved.

Description

Technical Field

[0001] The present invention relates to the field of forklift fork measurement, and in particular to a testing system for detecting fork shape and position tolerance and load displacement. Background Art

[0002] The form and position tolerances and load displacement of forklift forks are key indicators that affect the safety performance of forklifts. Traditional forklift testing equipment typically uses separate devices and methods to perform these two tests. Form and position tolerance testing often relies on manual measurement, which is inefficient and difficult to achieve high-precision measurements. Load displacement testing often uses non-contact rangefinders (such as laser and ultrasonic rangefinders) or displacement sensors mounted on the fork base. The former is easily affected by the fork surface condition or environmental interference, resulting in inaccurate or failure measurements, while the latter cannot directly and accurately reflect the actual deformation of the fork under load. The above two tests are independent of each other, and the detection efficiency needs to be improved. Therefore, there is an urgent need for a test system that can efficiently detect the form and position tolerances and load displacement of forks. Summary of the Invention

[0003] The object of the present invention is to provide a testing system for detecting the form and position tolerance and load displacement of a fork, which solves the problem that existing forklift fork measuring devices are difficult to quickly and effectively detect the form and position tolerance and load displacement of the fork.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions: A testing system for detecting the form and position tolerance and load displacement of a fork includes a support mechanism equipped with a traction mechanism and a mounting seat, the mounting seat being removably connected to the output end of the traction mechanism or the fork. A measuring mechanism is provided on one side of the mounting seat, and a measuring frame is vertically fixed to one side of the support mechanism. The measuring mechanism includes a bracket hinged to one side of the mounting seat, a test wheel mounted at the bracket's suspended end, an angle sensor for detecting the bracket's swing angle, and a speed sensor for detecting the test wheel's speed. An elastic force-applying member is provided between the bracket and the mounting seat to force the test wheel into close contact with the fork or the measuring frame.

[0005] As a further optimization scheme of the present invention, when testing form and position tolerance, the mounting seat is connected to the output end of the traction mechanism, the suspension end of the bracket is tilted downward, the elastic force-applying component is in a stretched state, and a pulling force is applied to the bracket to make the test wheel close to the fork; when testing load displacement, the mounting seat is connected to the fork, the suspension end of the bracket is tilted upward, the elastic force-applying component is in a compressed state, and pressure is applied to the bracket to make the test wheel close to the measuring frame.

[0006] As a further optimization scheme of the present invention, a locking member is provided on the mounting seat, and the locking member includes a locking block inserted into the mounting seat, and a locking groove for locking the output end of the traction mechanism or the fork is formed between the locking block and the mounting seat, and a threaded fastener is provided through the locking block, and one end of the threaded fastener is threadedly connected to the mounting seat.

[0007] As a further optimization scheme of the present invention, threaded fasteners are provided on both sides of the locking block, and gear 1 is fixed to the other end of the threaded fastener, and gear 2 is meshed and connected between the two gears 1, one end of gear 2 is rotatably connected to the locking block, and a knob is fixed to the other end of gear 2.

[0008] As a further optimization solution of the present invention, two measuring mechanisms and two locking members are provided on the mounting base.

[0009] As a further optimization scheme of the present invention, the traction mechanism includes a drive shaft and a rotating drive member for rotating the drive shaft, and a screw rod corresponding one-to-one to the locking member, a first bevel gear is fixed to one end of the screw rod, and a second bevel gear corresponding one-to-one to the first bevel gear is fixed on the drive shaft, a slider is threadedly connected to the screw rod, and the slider is used to connect the locking member.

[0010] As a further optimization solution of the present invention, the rotating drive component includes a motor, a worm fixed to the output end of the motor, and a worm wheel meshingly connected to one side of the worm, and the worm wheel is fixed to the middle of the drive shaft.

[0011] As a further optimization scheme of the present invention, the mounting seat includes a mounting plate, a slot corresponding to the locking block is provided on the mounting plate, a connecting tube corresponding to the threaded fastener is fixed on the side of the mounting plate away from the slot, and a through hole is provided on the side of the slot close to the connecting tube.

[0012] As a further optimization solution of the present invention, a counterweight is detachably connected to the mounting seat, and a frame is fixedly provided on one side of the mounting plate provided with a connecting tube, and the frame is used to connect the elastic force-applying component and the counterweight.

[0013] As a further optimization scheme of the present invention, the support mechanism includes a frame and an assembly plate fixed on the inner side of the frame, the assembly plate is used to install the traction mechanism, the frame is provided with a positioning mechanism, the positioning mechanism includes a linear drive component, and a vacuum suction cup provided at the output end of the linear drive component, and the vacuum suction cup is connected to a negative pressure device.

[0014] The beneficial effects of the present invention are: 1) The present invention has a bracket hinged on the mounting seat, and a test wheel is provided at the suspension end of the bracket. When testing the form and position tolerance of the fork, the mounting seat is moved by a traction mechanism, and the test wheel is in close contact with the fork. Form and position tolerance testing is achieved by detecting changes in the bracket's swing angle. When testing the fork's load displacement, the mounting seat is fixed to the fork, and the test wheel is in close contact with the measuring frame. When the fork moves up and down, the speed sensor detects changes in the test wheel's speed to detect the load displacement, thereby optimizing the testing process and improving the detection accuracy. 2) When testing form and position tolerances, the mounting seat is connected to the traction mechanism, the bracket's suspended end is tilted downward, and the elastic force-applying component is in a stretched state, applying tension to the bracket to force the test wheel into close contact with the fork. When testing load displacement, the mounting seat is connected to the fork, the bracket's suspended end is tilted upward, and the elastic force-applying component is in a compressed state, applying pressure to the bracket to force the test wheel into close contact with the measuring frame. The weight of the bracket and test wheel, as well as the elastic force of the elastic force-applying component, improves the fit between the test wheel and the contact target, further increasing detection accuracy. 3) When testing load displacement, the present invention flips the mounting base so that the suspended end of the bracket is tilted upward. This ensures that the fork can smoothly extend into the support mechanism for form and position tolerance testing, and also ensures that the fork can fit into the measuring frame at a low position and perform load displacement testing. This improves detection accuracy while preventing interference between the two tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the working state of the test system of the present invention when testing the form and position tolerance of a forklift; Figure 2 It is a structural schematic diagram of the traction mechanism of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 It is a structural schematic diagram of the measuring mechanism of the present invention; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram of the working state of the locking member of the present invention when it is plugged into the mounting base; Figure 7 This is a schematic diagram of the working state of the locking member of the present invention when it is separated from the mounting base; Figure 8 This is a schematic diagram of the working state of the test system of the present invention when testing the load displacement of a forklift; Figure 9 Schematic diagram of the overall structure of the counterweight of the present invention; Figure 10 Schematic diagram of the internal structure of the counterweight of the present invention; Figure 11 for Figure 10Enlarged view of point C in the middle; In the figure: 1. Support mechanism; 2. Traction mechanism; 3. Mounting seat; 4. Measuring mechanism; 5. Measuring frame; 6. Locking member; 7. Counterweight; 8. Positioning mechanism; 11. Frame; 12. Assembly plate; 21. Drive shaft; 22. Screw; 23. First bevel gear; 24. Second bevel gear; 25. Slider; 26. Motor; 27. Worm; 28. Worm gear; 31. Mounting plate; 32. Slot; 33. Connecting cylinder; 34. Through hole; 35. Frame; 41. Bracket; 42. Test wheel; 43. Angle sensor; 44. Speed ​​sensor; 45. Elastic force-applying member; 61. Locking block; 62. Threaded fastener; 63. Gear 1; 64. Gear 2; 65. Knob; 71. Box; 72. Connecting ring; 73. Counterweight; 74. Stud; 75. Positioning sleeve; 81. Linear drive member; 82. Vacuum suction cup; F. Fork DETAILED DESCRIPTION

[0016] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0017] Example like Figure 1 and Figure 2 As shown, this embodiment relates to a test system for detecting the form and position tolerance and load displacement of a fork. The test system includes a support mechanism 1 consisting of a frame 11 and an assembly plate 12, and the assembly plate 12 is arranged on the inner side of the frame 11. A traction mechanism 2 is provided on the assembly plate 12 of the support mechanism 1. The output end of the traction mechanism 2 is connected to a mounting seat 3. A test space for accommodating the traction mechanism 2 and the mounting seat 3 is formed between the assembly plate 12 and the top of the frame 11. A measuring mechanism 4 is provided on one side of the mounting seat 3, and a measuring frame 5 is fixed to one side of the support mechanism 1 in the vertical direction. A locking member 6 is provided on the mounting seat 3, and is detachably connected to the output end of the traction mechanism 2 or the fork F through the locking member 6.

[0018] like Figure 2-5As shown, the mounting base 3 has a mounting plate 31 with a frame 35 fixedly mounted on one side of the mounting base 3. The measuring mechanism 4 includes a bracket 41 hinged to one side of the mounting base 3, a test wheel 42 rotatably mounted on a suspended end of the bracket 41, an angle sensor 43 for detecting the swing angle of the bracket 41, and a speed sensor 44 for detecting the rotational speed of the test wheel 42. An elastic force-applying member 45 is disposed between the bracket 41 and the mounting base 3. The elastic force-applying member 45 is preferably a spring, which is used to hold the test wheel 42 in close contact with the forks F or the measuring frame 5. Alternatively, in other embodiments, the spring can be replaced with a torsion spring. A hinged frame is disposed between the mounting plate 31 and the frame 35, through which the bracket 41 is hingedly connected to the mounting base 3. One end of the spring is hinged to the frame 35, and the other end is hinged to the interior of the bracket 41. The bracket 41 has a mounting slot corresponding to the spring. The measuring mechanism 4 also includes a controller connected to the angle sensor 43 and the speed sensor 44. The controller is mounted inside the frame 35. The bracket 41 is fixed with a hinge shaft connected to the hinge frame. The angle sensor 43 is fixedly mounted on the hinge frame, and its detection end is fixedly connected to the hinge shaft of the bracket 41. The speed sensor 44 is fixedly mounted on the suspension end of the bracket 41, and its detection end is connected to the test wheel 42.

[0019] When checking the shape and position tolerances of the fork F, please refer to Figure 1 and Figure 2 The forklift moves close to the support mechanism 1, and the forklift's fork F extends into the inner side of the support mechanism 1. The mounting seat 3 is positioned downward, with the frame 35 positioned below the mounting plate 31. The mounting seat 3 is connected to the output end of the traction mechanism 2 via the locking member 6. At this time, the suspended end of the bracket 41 tilts downward and abuts against the top of the fork F. Under the stopping action of the fork F, the distance between the test wheel 42 and the suspended end of the bracket 41 and the mounting seat 3 is relatively large, and the elastic force-applying member 45 is in a stretched state. The elastic force-applying member 45 applies a tensile force to the bracket 41 to keep the test wheel 42 in close contact with the fork F. The mounting seat 3 is then moved laterally by the traction mechanism 2, and the swing angle change of the bracket 41 is detected by the angle sensor 43 in cooperation with the controller. The controller calculates the straightness of the fork F based on the swing angle change of the bracket 41, thereby determining whether the shape of the fork F meets the requirements of the form and position tolerances.

[0020] When checking the load displacement of fork F, refer to Figure 8 and Figure 9, the forklift's fork F is located outside the support mechanism 1, and the mounting seat 3 is set upward so that the frame 35 is above the mounting plate 31. The mounting seat 3 is connected to the fork F through the locking member 6, and the suspension end of the bracket 41 is tilted upward. The forklift and the support mechanism 1 are brought closer to each other. At this time, the test wheel 42 of the measuring mechanism 4 is squeezed by the measuring frame 5, and the distance between the test wheel 42 and the suspension end of the bracket 41 and the mounting seat 3 is relatively close. The elastic force-applying component 45 is in a compressed state, and the elastic force-applying component 45 applies pressure to the bracket 41 to make the test wheel 42 close to the measuring frame 5. After that, the forklift controls the fork F to move up and down. During the movement of the fork F, the speed sensor 44 cooperates with the controller to detect the speed of the test wheel 42. According to the change in the speed of the test wheel 42, it is analyzed whether the displacement change of the fork F under the load condition is abnormal, thereby realizing the detection of the load displacement of the fork F.

[0021] The above-mentioned measuring mechanism 4 can not only detect whether the shape of the fork F meets the requirements of form and position tolerances, but also measure whether the displacement of the fork F under load conditions is abnormal. During the test, since the suspension end of the bracket 41 is facing downward when detecting form and position tolerances, and the suspension end of the bracket 41 is facing upward when detecting load displacement, the deadweight of the bracket 41 and the test wheel 42 can improve the fit between the test wheel 42 and the contact target of the test wheel 42, and further improve the fit through the elastic force-applying component 45, prevent the test wheel 42 from slipping, and improve the test accuracy. Compared with non-contact measurement methods, the requirements for the color, reflectivity, transparency, acoustic properties, etc. of the object surface are relatively low. Since the suspension end of the bracket 41 is set downward during form and position tolerance detection, and the suspension end of the bracket 41 is set upward during load displacement detection, it is ensured that the fork F can be smoothly inserted into the support mechanism 1 for form and position tolerance detection, and the fork F can perform load displacement detection at a low position.

[0022] Furthermore, if Figure 6 and Figure 7As shown, the mounting base 3 is equipped with two measuring mechanisms 4 and two locking members 6, allowing for simultaneous testing of a pair of forks F on a forklift. The locking member 6 comprises a U-shaped locking block 61 inserted into the mounting base 3. A locking slot is formed between the locking block 61 and the mounting base 3 for locking the output end of the traction mechanism 2 or the forks F. Threaded fasteners 62 extend through both sides of the locking block 61, one end of which is threadedly connected to the mounting base 3. The mounting plate 31 of the mounting base 3 is provided with a slot 32 corresponding to the locking block 61. A connecting tube 33 corresponding to the threaded fastener 62 is fixed to the side of the mounting plate 31 facing away from the slot 32. The inner wall of the connecting tube 33 is provided with a threaded groove corresponding to the threaded fastener 62. A through hole 34 is provided on the side of the slot 32 near the connecting tube 33. The threaded fastener 62 has a head and a rod, and the rod is provided with threads. The head has a larger cross-sectional area, and the locking force of the threads can be transmitted to the locking block 61 through the head of the threaded fastener 62. When the threaded fastener 62 is screwed into the connecting tube 33, the head of the threaded fastener 62 is tightly pressed against the locking block 61, so that the locking block 61 locks the fork F in the locking groove or the output end of the traction mechanism 2, thereby realizing the locking effect of the locking member 6.

[0023] To enhance the ease of operation of locking member 6, a gear 1 63 is fixed to the head of threaded fastener 62. A gear 2 64 meshes between the two gears 1 63. One end of gear 2 64 is rotatably connected to locking block 61, and a knob 65 is fixed to the other end of gear 2 64. Knob 65 is prism-shaped, rotatably connecting threaded fastener 62 to locking block 61. Rotating knob 65 causes gear 2 64 to rotate synchronously with gear 1 63, thereby simultaneously threading the two threaded fasteners 62 into the two connecting cylinders 33. In other embodiments, knob 65 may be omitted, and a handle or a hexagonal slot may be provided on gear 2 64.

[0024] Furthermore, if Figure 3As shown, the traction mechanism 2 of this embodiment includes a drive shaft 21, a rotary drive member for rotating the drive shaft 21, and a screw 22 corresponding to the locking member 6. A first bevel gear 23 is fixed to one end of the screw 22, and a second bevel gear 24 is fixed to the drive shaft 21, corresponding to the first bevel gear 23. A slider 25 is threadedly connected to the screw 22 and connected to the locking member 6. The slider 25 serves as the output end of the traction mechanism 2. One end of the screw 22 is rotatably mounted above the mounting plate 12, and the other end is rotatably mounted on the vehicle frame 11. Both ends of the drive shaft 21 are rotatably connected to the mounting plate 12. The rotary drive member includes a motor 26, a worm 27 fixed to the output end of the motor 26, and a worm gear 28 meshingly connected to one side of the worm 27. The worm gear 28 is fixed to the middle portion of the drive shaft 21. The worm 27 is connected to an encoder, which is connected to the controller of the measuring mechanism 4. The encoder detects the rotational speed of the worm 27, and the controller calculates the movement speed of the mounting base 3 based on the rotational speed.

[0025] In addition, if Figure 9 and 10 As shown, a counterweight 7 is detachably connected to the mounting base 3. When testing the load displacement of the fork F, the counterweight 7 can also be installed on the mounting base 3 to simulate the working state of the fork F under different loads and perform load displacement testing on the fork F under different loads. The counterweight 7 includes a housing 71, a connecting ring 72 fixed to the bottom of the housing 71, a plurality of counterweights 73 disposed within the housing 71, a stud 74 fixed to the bottom wall of the housing 71, and a positioning sleeve 75 threadedly connected to the stud 74. The connecting ring 72 is connected to the frame 35 via bolts. The counterweights 73 are provided with sockets corresponding to the studs 74. The number of counterweights 73 placed in the housing 71 is adjustable, and the adjusted number of counterweights 73 can be fixed by rotating the positioning sleeve 75.

[0026] In addition, a positioning mechanism 8 is provided on the frame 11, and the positioning mechanism 8 includes a linear drive member 81, and a vacuum suction cup 82 provided at the output end of the linear drive member 81, and the vacuum suction cup 82 is connected to a negative pressure device. In this embodiment, during the detection process, the frame 11 is braked by the positioning mechanism 8. During the braking process of the frame 11, the vacuum suction cup 82 is moved down and pressed against the ground by the linear drive member 81, and the vacuum suction cup 82 is vacuumed by the negative pressure device, so that the positioning mechanism 8 and the frame 11 are fixed to the ground to prevent measurement errors caused by the movement of the frame 11. In addition, the frame 11 can also be replaced with a support member without casters. During the test, the support mechanism 1 is fixed and the relative position relationship between the fork F and the support mechanism 1 is adjusted only by the movement of the forklift.

[0027] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A testing system for detecting fork shape and position tolerance and load displacement, comprising a support mechanism (1), characterized in that: The support mechanism (1) is provided with a traction mechanism (2) and a mounting seat (3), and the mounting seat (3) can be detachably connected to the output end of the traction mechanism (2) or the fork, a measuring mechanism (4) is provided on one side of the mounting seat (3), and a measuring frame (5) is fixedly provided on one side of the support mechanism (1) in a vertical direction; The measuring mechanism (4) comprises a bracket (41) hinged to one side of the mounting seat (3), a test wheel (42) provided at a suspended end of the bracket (41), an angle sensor (43) for detecting the swing angle of the bracket (41), and a rotation speed sensor (44) for detecting the rotation speed of the test wheel (42). An elastic force-applying component (45) is provided between the bracket (41) and the mounting seat (3) to enable the test wheel (42) to be in close contact with the fork or the measuring frame (5).

2. The test system according to claim 1, wherein: When testing the form and position tolerance, the mounting seat (3) is connected to the output end of the traction mechanism (2), the suspension end of the bracket (41) is tilted downward, the elastic force-applying component (45) is in a stretched state, and a pulling force is applied to the bracket (41) so that the test wheel (42) is in close contact with the fork; when testing the load displacement, the mounting seat (3) is connected to the fork, the suspension end of the bracket (41) is tilted upward, the elastic force-applying component (45) is in a compressed state, and a pressure is applied to the bracket (41) so that the test wheel (42) is in close contact with the measuring frame (5).

3. The test system according to claim 1, wherein: The mounting seat (3) is provided with a locking member (6), the locking member (6) comprising a locking block (61) plugged into the mounting seat (3), and a locking groove for locking the output end of the traction mechanism (2) or the fork is formed between the locking block (61) and the mounting seat (3), a threaded fastener (62) is provided through the locking block (61), and one end of the threaded fastener (62) is threadedly connected to the mounting seat (3).

4. The test system according to claim 3, wherein: Threaded fasteners (62) are provided on both sides of the locking block (61), and a gear 1 (63) is fixed to the other end of the threaded fastener (62). A gear 2 (64) is meshed and connected between the two gear 1s (63), and one end of the gear 2 (64) is rotatably connected to the locking block (61).

5. The test system according to claim 3, wherein: There are two measuring mechanisms (4) and two locking members (6) on the mounting seat (3).

6. The test system according to claim 5, wherein: The traction mechanism (2) comprises a drive shaft (21) and a rotary drive member for rotating the drive shaft (21), and a screw rod (22) corresponding one-to-one with the locking member (6), a first bevel gear (23) being fixedly provided at one end of the screw rod (22), and a second bevel gear (24) corresponding one-to-one with the first bevel gear (23) being fixedly provided on the drive shaft (21), a slider (25) being threadedly connected to the screw rod (22), and the slider (25) being used to connect with the locking member (6).

7. The test system according to claim 6, wherein: The rotary drive member includes a motor (26), a worm (27) fixed to the output end of the motor (26), and a worm wheel (28) meshingly connected to one side of the worm wheel (27), wherein the worm wheel (28) is fixed to the middle of the drive shaft (21).

8. The test system according to claim 3, wherein: The mounting seat (3) comprises a mounting plate (31), a slot (32) corresponding to the locking block (61) is provided on the mounting plate (31), and a connecting cylinder (33) corresponding to the threaded fastener (62) is fixedly provided on a side of the mounting plate (31) away from the slot (32).

9. The test system according to claim 8, wherein: A counterweight (7) is detachably connected to the mounting seat (3), and a frame (35) is fixedly provided on one side of the mounting plate (31) provided with a connecting tube (33). The frame (35) is used to connect the elastic force-applying component (45) and the counterweight (7).

10. The test system according to claim 1, wherein: The support mechanism (1) comprises a vehicle frame (11) and an assembly plate (12) fixedly arranged on the inner side of the vehicle frame (11); the assembly plate (12) is used to install the traction mechanism (2); a positioning mechanism (8) is provided on the vehicle frame (11); the positioning mechanism (8) comprises a linear drive member (81) and a vacuum suction cup (82) arranged at the output end of the linear drive member (81); the vacuum suction cup (82) is connected to a negative pressure device.

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