A forklift mast testing device

Abstract

The present invention relates to the field of mast testing technology, and discloses a forklift mast testing device, including a base, a guide rod 1 is provided at each of the four corners of the top surface of the base, a lifting seat is slidably provided on two guide rods 1 on the same side, a positioning pin for fixing the support seat is passed through the lifting seat, and a plurality of overlapping counterweights are placed on the support seat, a linkage component for controlling the movement of the positioning pin and releasing the positioning is provided on the lifting seat, a bearing seat is provided on the top surface of the four guide rods 1, when the lifting seat slides upward, a speed measuring component for measuring the speed of the lifting seat is provided on the bearing seat, and an adjustment component for increasing or decreasing the counterweight is provided on the bearing seat. The present invention can not only effectively test the lifting speed of the fork under load, but also effectively increase or decrease the load during the test, thereby improving the use efficiency of the device.

Description

Technical Field

[0001] The invention relates to the technical field of mast testing, and in particular to a forklift mast testing device. Background Art

[0002] Forklifts are industrial handling vehicles. They are various wheeled handling vehicles that load and unload, stack and transport palletized goods over short distances. They are special equipment. The mast of a forklift is the main load-bearing structure of the forklift's pickup device and the mechanism for lifting goods. It is also called a mast. It consists of an inner mast, an outer mast, a fork frame, a fork, a sprocket, a chain, a lifting cylinder and a tilting cylinder.

[0003] According to the use requirements of special equipment, forklift masts need to be tested regularly to ensure the performance requirements of the forklift masts. When the existing test device tests the lifting speed of the mast under load, it usually uses a manual stopwatch to calculate the time during the lifting process, marks the measured stroke with a scale, calculates the lifting speed by the ratio of the stroke value and the time value and enters it manually. The above operation is relatively cumbersome, and the start and stop operation of the stopwatch is only performed by manual feeling, which is prone to test errors and affects the accuracy of the measurement; and during the test, the load cannot be adjusted to increase or decrease conveniently and quickly, which reduces the test efficiency under different load conditions. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above difficulties and provide a forklift mast testing device.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is as follows: a forklift gantry testing device, comprising a base, wherein guide rods are provided at four corners of the top surface of the base, and a lifting seat is slidably provided on two guide rods on the same side, and a support seat is swung together in the two lifting seats, and a slot for forks to extend into is provided on the support seat, and a positioning pin for fixing the support seat is penetrated on the lifting seat, and a plurality of overlapping counterweight blocks are placed on the support seat;

[0006] The lifting seat is provided with a linkage assembly for controlling the movement of the positioning pin and releasing the positioning. When the fork 9 is fully extended into the slot 114, the linkage assembly 2 is triggered to release the positioning. The linkage assembly includes a push seat slidably arranged on the two lifting seats, a frame is provided on the positioning pin and a wedge block is provided on the inner wall of the frame, and a support frame is provided on the lifting seat. A matching block adapted to the wedge block is slidably provided on the support frame, and the push seat slides backward to drive the matching block to slide forward and extend its positioning pin outward to release the positioning, and an abutment seat for the end of the fork to extend into is swingably provided on the inner side surface of the push seat;

[0007] A bearing seat is commonly arranged on the top surface of the four guide rods. When the lifting seat slides upward, a speed measuring component for measuring the speed of the lifting seat is arranged on the bearing seat, and an adjustment component for increasing or decreasing the counterweight block is arranged on the bearing seat.

[0008] As an improvement, the speed measuring assembly includes a toothed plate fixedly mounted on a lifting seat, a through slot for the toothed plate to extend out is opened on the supporting seat, a U-shaped frame is provided on the supporting seat and a rotating shaft is passed through the U-shaped frame, a gear meshing with the toothed plate is provided on the rotating shaft, and the outer end of the rotating shaft is connected to the input shaft of the speed measuring encoder.

[0009] As an improvement, a mounting seat is provided on the lifting seat and a swing arm is hinged on the mounting seat, and the upper and lower ends of the swing arm are respectively hinged with a swing rod 1 and a swing rod 2, and the other ends of the swing rod 1 and the swing rod 2 are respectively hinged on the push seat and the matching block.

[0010] As an improvement, the adjustment assembly includes a U-shaped support frame 1 arranged at both ends of the bearing seat, a support frame 2 is provided in the middle of the top surface of the two support frames 1, an electric hoist is provided on the support frame 2, a sling assembly for connecting the counterweight block is suspended on the electric hoist, and a bearing assembly for bearing the sling assembly is provided on the support frame 1.

[0011] As an improvement, the sling assembly includes a lifting frame connected to both ends of the counterweight block, a cross frame body connected to the electric hoist is commonly provided in the middle of the two lifting frames, and continuous sawtooth bodies are provided on the two lifting frames along their height direction;

[0012] The bearing assembly includes a swing frame hinged at both ends of each support frame, a bearing frame of L-shaped structure is hinged on the swing frame, one end of the bearing frame is provided with a positioning tooth for clamping the sawtooth body, and the other end is provided with a slide groove, each slide groove is provided with a slider matched therewith, and the two slides on the same side are hinged together on the connecting frame of T-shaped structure, a telescopic rod is provided between the top surface of the connecting frame and the bottom surface of the support frame, and mounting frames are provided on the front and rear side surfaces of both ends of each support frame, and elastic plates of arc-shaped structure are provided under the connecting frames in the four mounting frames, and a locking assembly for fixing the adjacent ends of the two bearing frames on the same side is provided on the support frame.

[0013] As an improvement, the locking assembly includes a fixed seat arranged on each supporting frame, each of the fixed seats is penetrated by a movable pin with a rebound function, and a pin hole for inserting the movable pin is opened on the connecting frame, and an adjustment assembly for sliding control of the movable pin is provided on the supporting frame.

[0014] As an improvement, the adjustment assembly includes a support frame three arranged between two mounting frames on the same side, each of the support frames three is provided with a support body at both ends of the outer side surface, a bidirectional screw rod is provided between the two support bodies on the same side for common rotation, and a sliding rod is provided on the two support bodies on the other side, both ends of the bidirectional screw rod are threaded with sliding seats, both ends of the sliding rod are provided with movable blocks adapted thereto, and a connecting plate for pushing the movable pin is provided between the sliding seat and the movable block at the same end.

[0015] Furthermore, arc-shaped grooves are provided on both the front and rear sides of the opposite end surfaces of the two lifting seats, and an arc-shaped sliding block matched with the arc-shaped grooves is fixedly provided on the support seat.

[0016] The beneficial effects of the present invention compared with the prior art are:

[0017] 1. The lifting seat slides up and down, driving the tooth plate and gear to mesh and transmit, and then driving the speed encoder to rotate, so as to conduct a convenient and fast accuracy test on the lifting speed of the forklift mast;

[0018] 2. The full extension of the fork can drive the push seat to slide backward, and under the action of the linkage component, the positioning pin is driven to extend outward, so that the positioning of the support seat is automatically released, so that the fork can be tilted backward under load;

[0019] 3. Connect the counterweight block through the lifting device assembly, and then start the electric hoist to lift the counterweight block to the upper position of the bearing seat. Then, through the cooperation of the bearing assembly and the locking assembly, the counterweight block can be effectively supported, thereby avoiding the phenomenon of the electric hoist pulling the counterweight block upward for a long time;

[0020] 4. After the load-bearing assembly is connected to the sling assembly, rotate the bidirectional screw to drive the sliding seats at both ends to move relative to each other, and then drive the connecting plates at both ends to move relative to each other, and push the corresponding moving pins to make the moving pins and the pin holes on the connecting frame cooperate, so that the hinged load-bearing frames at both ends can be fixedly connected, ensuring the stability of the counterweight when bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The structure of the present invention is schematically shown in FIG. Figure 1 .

[0022] Figure 2 The structure of the present invention is schematically shown in FIG. Figure 2 .

[0023] Figure 3 It is a disassembled structural diagram of the lifting seat and the supporting seat in the present invention.

[0024] Figure 4It is an internal structural diagram of the connection between the lifting seat and the supporting seat in the present invention.

[0025] Figure 5 It is a structural schematic diagram of the linkage component in the present invention.

[0026] Figure 6 It is a structural schematic diagram of the speed measuring component and the locking component in the present invention.

[0027] Figure 7 It is an internal structure diagram of the cooperation between the fixed seat and the movable pin in the present invention.

[0028] Figure 8 It is a structural schematic diagram of the adjustment component and the hanger component in the present invention.

[0029] Fig. 9 It is a structural schematic diagram of the sling assembly and the locking assembly in the present invention.

[0030] Fig.10 It is a structural schematic diagram of the regulating component in the present invention.

[0031] Fig.11 It is a side structural schematic diagram of the present invention.

[0032] As shown in the figure: 1. Base; 111. Guide rod 1; 112. Lifting seat; 113. Support seat; 114. Slot body; 115. Arc groove; 116. Arc slider; 117. Positioning pin; 118. Cavity 1; 119. Press plate 1; 120. Return spring 1; 121. Bearing seat; 122. Counterweight; 2. Linkage assembly; 211. Push seat; 212. Mounting seat; 213. Swing arm; 214. Frame; 215, wedge block; 216, support frame; 217, matching block; 218, swing rod 1; 219, swing rod 2; 220, guide rod 2; 221, limit block; 222, return spring 2; 223, abutment seat; 3, speed measuring assembly; 311, tooth plate; 312, U-shaped frame; 313, rotating shaft; 314, gear; 315, speed measuring encoder; 316, stabilizing plate; 317, guide groove; 318 , through slot; 4, adjustment assembly; 411, support frame 1; 412, support frame 2; 413, electric hoist; 5, lifting assembly; 511, lifting frame; 512, cross frame body; 513, sawtooth body; 514, notch; 515, slide rail; 6, bearing assembly; 611, swing frame; 612, bearing frame; 613, positioning teeth; 614, slide groove; 615, slider; 616, connecting frame; 617, telescopic Rod; 618, mounting frame; 619, elastic plate; 7, locking assembly; 711, fixed seat; 712, movable pin; 713, cavity two; 714, pressure plate two; 715, reset spring three; 8, adjustment assembly; 811, support frame three; 812, support body; 813, bidirectional screw rod; 814, sliding rod; 815, sliding seat; 816, movable block; 817, connecting plate; 818, motor; 9, fork. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] Combined with Figure 1 , Attachment Figure 3 , Attachment Figure 4 and attached Figure 5As shown, a forklift gantry testing device comprises a base 1, wherein guide rods 111 are provided at the four corners of the top surface of the base 1, and a lifting seat 112 is slidably provided on two guide rods 111 on the same side, and a support seat 113 is swung together in the two lifting seats 112, and a groove body 114 for a fork 9 to extend into is provided on the support seat 113, and arc grooves 115 are provided on the front and rear sides of the opposite end surfaces of the two lifting seats 112, and an arc sliding block 116 adapted to the arc groove 115 is fixedly provided on the support seat 113, and the support seat 113 is moved forward under the cooperation of the arc sliding block 116 and the arc groove 115. In order to adjust the swing, a positioning pin 117 for fixing the support seat 113 is provided on the lifting seat 112, and a matching hole for inserting the positioning pin 117 is provided in the support seat 113, and a plurality of overlapping and matching counterweights 122 are placed on the support seat 113, and positioning holes are provided on the top surfaces of the plurality of counterweights 122, and positioning rods are provided on the bottom surfaces. With the cooperation of the positioning rods and the positioning holes, the plurality of counterweights 122 are placed in an overlapping manner. By positioning the support seat 113, the swing of the support seat 113 when placing the counterweight 122 is avoided, thereby ensuring the connection stability of the support seat 113 when placing the counterweight 122;

[0035] The lifting seat 112 is provided with a linkage assembly 2 for controlling the movement of the positioning pin 117 and releasing the positioning. When the fork 9 is fully extended into the slot 114, the linkage assembly 2 is triggered to release the positioning. The linkage assembly 2 includes a push seat 211 slidably arranged on the two lifting seats 112, and a guide rod 220 slidably matched with the push seat 211 is fixedly arranged on the end surface of the lifting seat 112. A limit block 221 is fixedly arranged at the end of the guide rod 220, and a limit block 221 is also fixedly arranged on the guide rod 220 between the limit block 221 and the push seat 211. A second return spring 222 is wound around it, a frame 214 is provided on the outer end surface of the positioning pin 117, and a wedge block 215 is provided on the inner wall of the frame 214, a support frame 216 is provided on the lifting seat 112, and a matching block 217 adapted to the wedge block 215 is slidably provided on the support frame 216, and the push seat 211 slides backward to drive the matching block 217 to slide forward and extend the positioning pin 117 outward to release the positioning, and an abutment seat 223 for the end of the fork 9 to extend into is swingably provided on the inner side surface of the push seat 211;

[0036] A bearing seat 121 is commonly provided on the top surface of the four guide rods 111. When the lifting seat 112 slides upward, a speed measuring component 3 for measuring the speed of the lifting seat 112 is provided on the bearing seat 121, and an adjustment component 4 for increasing or decreasing the counterweight block 122 is provided on the bearing seat 121.

[0037] When the forklift is in use, the fork 9 is first extended under the storage rack to be transferred, and then the forklift mast is controlled to tilt backward, and then the forklift mast is controlled to move upward for adjustment. By adjusting the backward tilt of the forklift mast, the goods on the storage rack can be prevented from slipping during the driving process of the forklift. Through the above structure, when the forklift mast is inspected, the fork 9 is fully extended into the groove 114. At this time, the end of the fork 9 will first extend into the abutment seat 223, and then the push seat 211 will be pushed to move backward. Under the action of the linkage assembly 2, the positioning of the support seat 113 is automatically released, and the forklift mast is controlled to swing backward. The swing range is 6 to 12 degrees. Under the action of the fork 9, the support seat is driven 113 performs a swing operation on the lifting seat 112, and at the same time drives the abutment seat 223 to swing and adjust on the pushing seat 211, so that the fork 9 is always in a state of pushing out the pushing seat 211, so that it is always in a state of releasing the positioning of the support seat 113. In this way, the smoothness of the backward tilt of the fork 9 can be tested under the load state, and then the fork 9 is controlled to slide up and down, driving the lifting seat 112 to slide up and down synchronously. Under the action of the speed measuring component 3, the lifting speed of the fork 9 under the load state is effectively tested. During the test, the number of counterweight blocks 122 is increased or decreased by the adjustment component 4, so that the action of the fork 9 can be effectively tested under different load states.

[0038] Combined with Figure 2 and attached Figure 6 As shown, the speed measuring component 3 includes a tooth plate 311 fixedly arranged on a lifting seat 112 at one end, and a stabilizing plate 316 is fixedly arranged on the lifting seat 112 at the other end at a position symmetrical to the tooth plate 311. Through grooves 318 are provided at both ends of the bearing seat 121 for the tooth plate 311 and the stabilizing plate 316 to extend out. The tooth plate 311 and the stabilizing plate 316 are respectively provided with guide grooves 317 along their height directions at the opposite ends. A guide block slidably connected to the guide groove 317 is fixedly arranged on the inner wall of the through groove 318. With the cooperation of the guide groove 317 and the guide block, the stability of the tooth plate 311 and the stabilizing plate 316 during the up and down sliding process can be ensured. A U-shaped frame 312 is provided on the bearing seat 121 near the tooth plate 311, and a rotating shaft 313 is passed through the U-shaped frame 312. The rotating shaft 313 is provided with a gear 314 meshing with the tooth plate 311, and the outer end of the rotating shaft 313 is connected to the input shaft of the speed measuring encoder 315.

[0039] The working principle of the speed measuring component 3 is that when the fork 9 drives the support seat 113 to move up and down, it drives the lifting seat 112 to slide up and down, and then drives the tooth plate 311 to slide up and down synchronously, and then drives the gear 314 meshing with it to rotate, and at the same time drives the rotating shaft 313 to rotate, and then drives the input shaft of the speed measuring encoder 315 to rotate, so as to conveniently and quickly test the lifting speed of the fork 9 under the load state.

[0040] Combined with Figure 4 and attached Figure 5 As shown, the lifting seat 112 is provided with a mounting seat 212 and a swing arm 213 is hinged on the mounting seat 212, and the upper and lower ends of the swing arm 213 are respectively hinged with a swing rod 1 218 and a swing rod 219, and the other ends of the swing rod 1 218 and the swing rod 219 are respectively hinged on the push seat 211 and the matching block 217, and the lifting seat 112 is provided with a cavity 118 for the positioning pin 117 to penetrate, and a pressure plate 119 is fixedly provided on the positioning pin 117 in the cavity 118, and a return spring 120 is also sleeved on the positioning pin 117 between the pressure plate 119 and the inner wall of the cavity 118.

[0041] The working principle of the movement of the positioning pin 117 is that when the push seat 211 moves backward, it drives the swing rod 1 218 to swing backward, and then drives the articulated swing arm 213 to swing backward, and then drives the articulated swing rod 219 to swing forward, driving the matching block 217 to slide forward, and under the cooperation of the matching block 217 and the wedge block 215, the positioning pins 117 at both ends are driven to extend outward to release the positioning of the support seat 113. When the test is completed, after the thrust of the fork 9 on the push seat 211 disappears after it is extended, the push seat 211 is automatically reset under the action of the reset spring 222, and then the positioning pin 117 is automatically reset under the action of the reset spring 1 120.

[0042] Combined with Figure 8 , Attachment Fig. 9 and attached Fig.11 As shown, the adjustment component 4 includes a U-shaped support frame 1 411 arranged at both ends of the bearing seat 121, a support frame 2 412 is arranged in the middle of the top surface of the two support frames 1 411, and an electric hoist 413 is arranged on the support frame 2 412. A sling assembly 5 for connecting the counterweight block 122 is suspended on the electric hoist 413 through a steel wire rope, and a slot 514 for the sling assembly 5 to penetrate is opened on the bearing seat 121. A bearing assembly 6 for bearing the sling assembly 5 is arranged on the support frame 1 411, and the phenomenon that the pulling force of the counterweight block 122 always falls on the electric hoist 413 can be avoided by the bearing assembly 6.

[0043] The sling assembly 5 includes a lifting frame 511 connected to the two ends of the counterweight 122, and a cross frame body 512 connected to the wire rope on the electric hoist 413 is commonly provided in the middle of the two lifting frames 511. A continuous sawtooth body 513 is provided on the two lifting frames 511 along the height direction thereof, and a downwardly extending slide rail 515 is fixedly provided on the inner wall of the notch 514, and a movable body fixedly matched with the end of the lifting frame 511 is slidably provided in the slide rail 515, so as to avoid the shaking phenomenon of the lifting frame 511 during the up and down movement. A high-strength plug pin is penetrated at both ends of each lifting frame 511, and a partial external thread is provided at the end of the plug pin, and an internal thread hole for external thread connection is provided on the counterweight 122. The plug pin is inserted into the lifting frame 511, and then the plug pin is rotated. The plug pin is connected through the cooperation of the external thread and the internal thread, so that the counterweight 122 is connected to the lifting frame 511;

[0044] The bearing assembly 6 includes a swing frame 611 hinged on the front and rear sides of both ends of each support frame 411, and an L-shaped bearing frame 612 is hinged on the swing frame 611. One end of the bearing frame 612 is provided with a positioning tooth 613 for clamping the sawtooth body 513, and the other end is provided with a slide groove 614. Each slide groove 614 is provided with a slider 615 matched thereto, and the two sliders 615 on the same side are hinged together on the T-shaped connecting frame 616, and a telescopic rod 617 is provided between the top surface of the connecting frame 616 and the bottom surface of the support frame 411. A mounting frame 618 is provided on the front and rear sides of both ends of each support frame 411, and an arc-shaped elastic plate 619 is provided in the four mounting frames 618 below the connecting frame 616, and a locking assembly 7 is provided on the support frame 411 for fixing the adjacent ends of the two bearing frames 612 on the same side.

[0045] The working principle of the load-bearing assembly 6 is that the load-bearing frames 612 at both ends are in a horizontal state in a natural state. The sling assembly 5 is moved upward by starting the electric hoist 413. When the lifting frame 511 moves to the load-bearing frame 612, the serrated body 513 slides over the end face of the positioning tooth 613, which will drive the load-bearing frames 612 at both ends to swing outward synchronously, and at the same time drive the hinged connecting frame 616 to slide downward. When the serrated body 513 and the positioning tooth 613 are fully matched, the load-bearing frames 612 at both ends are reset to a horizontal state under the action of the elastic plate 619, and then the adjacent ends of the two load-bearing frames 612 on the same side are fixedly connected through the locking assembly 7, which ensures the stability of the positioning tooth 613 and the serrated body 513 after matching, so that the counterweight block 122 can be effectively loaded, avoiding the phenomenon of the electric hoist 413 pulling the counterweight block 122 upward for a long time.

[0046] Combined with Figure 6 , Attachment Figure 7 and attached Fig.10 As shown, the locking assembly 7 includes a fixed seat 711 arranged on each carrier 612, each of the fixed seats 711 is penetrated with a mobile pin 712 with a rebound function, and a pin hole for inserting the mobile pin 712 is provided on the connecting frame 616, a second cavity 713 for inserting the mobile pin 712 is provided in the fixed seat 711, a second pressing plate 714 is fixed on the mobile pin 712 in the second cavity 713, and a third return spring 715 is wound between the second pressing plate 714 and the inner wall of the second cavity, and an adjusting assembly 8 for sliding control of the mobile pin 712 is provided on the supporting frame 1 411;

[0047] The adjustment assembly 8 includes a support frame 811 arranged between two mounting frames 618 on the same side, and each of the support frames 811 is provided with a support body 812 at both ends of the outer side surface, and a bidirectional screw rod 813 is provided between the two support bodies 812 on the same side for common rotation, and a sliding rod 814 is provided on the two support bodies 812 on the other side, and both ends of the bidirectional screw rod 813 are threaded with sliding seats 815, and both ends of the sliding rod 814 are provided with movable blocks 816 adapted thereto, and a connecting plate 817 for pushing the movable pin 712 is provided between the sliding seat 815 and the movable block 816 at the same end, and either end of the bidirectional screw rod 813 is connected to the output shaft of the motor 818.

[0048] The working principle of the locking assembly 7 is that when the supporting frames 612 at both ends are in a horizontal state, the motor 818 is started to drive the bidirectional screw rod 813 to rotate. Under the action of the opposite threaded forces at both ends, the sliding seats 815 at both ends are driven to move relative to each other, and at the same time, the connecting plates 817 at both ends are driven to move relative to each other, and the corresponding moving pins 712 are pushed to make the moving pins 712 and the pin holes on the connecting frames 616 cooperate, so that the ends of the two supporting frames 612 can be fixedly connected and the hinges can be released.

[0049] When the present invention is implemented, the forklift is first driven to the base 1, the fork 9 is adjusted to be parallel to the slot 114, and the fork 9 is completely inserted into the slot 114. During the insertion process, the push seat 211 is driven to move backward, and the positioning of the support seat 113 can be automatically released through the linkage component 2, and then the fork 9 is controlled to tilt and swing backward, so that the backward tilt smoothness of the fork 9 can be tested under the load state, and the fork 9 is controlled to move upward, and the lifting seat 112 is driven to move upward. During the upward movement, the lifting speed of the fork 9 under the load state can be conveniently and quickly detected through the speed measuring component 3. During the detection process, the number of counterweight blocks 122 can be effectively increased or decreased through the cooperation of the adjustment component 4, the hanger component 5 and the load-bearing component 6, so that the fork 9 can be tested under different load states, thereby improving the use efficiency of the device.

[0050] The present invention and its embodiments are described above, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and do not deviate from the purpose of the invention, they can creatively design a structure and embodiment similar to the technical solution, which should fall within the protection scope of the present invention.

Claims

1. A forklift mast testing device, comprising a base (1), characterized in that: Guide rods (111) are provided at the four corners of the top surface of the base (1); a lifting seat (112) is slidably provided on the two guide rods (111) on the same side; a support seat (113) is swung inside the two lifting seats (112) and a groove (114) is provided on the support seat (113) for the fork (9) to extend into; a positioning pin (117) is passed through the lifting seat (112) for fixing the support seat (113); and a plurality of overlapping counterweights (122) are placed on the support seat (113); The lifting seat (112) is provided with a linkage component (2) for controlling the movement of the positioning pin (117) and releasing the positioning. When the fork (9) is fully inserted into the groove body (114), the linkage component (2) is triggered to release the positioning. The linkage component (2) comprises a push seat (211) slidably arranged on the two lifting seats (112). The positioning pin (117) is provided with a frame (214) and a wedge block (215) is provided on the inner wall of the frame (214). The lifting seat (112) is provided with a support frame (216). The support frame (216) is slidably provided with a matching block (217) adapted to the wedge block (215). The push seat (211) slides backward to drive the matching block (217) to slide forward and make the positioning pin (117) extend outward to release the positioning. The inner side surface of the push seat (211) is provided with a swinging abutment seat (223) for the end of the fork (9) to extend into. A bearing seat (121) is commonly provided on the top surface of the four guide rods (111); when the lifting seat (112) slides upward, a speed measuring component (3) for measuring the speed of the lifting seat (112) is provided on the bearing seat (121); and an adjustment component (4) for increasing or decreasing the counterweight (122) is provided on the bearing seat (121).

2. A forklift mast testing device according to claim 1, characterized in that: The speed measuring assembly (3) comprises a toothed plate (311) fixedly mounted on a lifting seat (112); a through slot (318) is provided on a bearing seat (121) through which the toothed plate (311) extends; a U-shaped frame (312) is provided on the bearing seat (121); a rotating shaft (313) is passed through the U-shaped frame (312); a gear (314) meshing with the toothed plate (311) is provided on the rotating shaft (313); and an outer end of the rotating shaft (313) is connected to an input shaft of a speed measuring encoder (315).

3. A forklift mast testing device according to claim 1 or 2, characterized in that: The lifting seat (112) is provided with a mounting seat (212) and a swing arm (213) is hingedly connected to the mounting seat (212). The upper and lower ends of the swing arm (213) are respectively hingedly connected to a swing rod 1 (218) and a swing rod 2 (219), and the other ends of the swing rod 1 (218) and the swing rod 2 (219) are respectively hingedly connected to the push seat (211) and the matching block (217).

4. A forklift mast testing device according to claim 1, characterized in that: The adjustment assembly (4) comprises a U-shaped support frame 1 (411) arranged at both ends of the bearing seat (121), a support frame 2 (412) is arranged in the middle of the top surface of the two support frames 1 (411), an electric hoist (413) is arranged on the support frame 2 (412), a sling assembly (5) connected to the counterweight (122) is suspended on the electric hoist (413), and a bearing assembly (6) for bearing the sling assembly (5) is arranged on the support frame 1 (411).

5. A forklift mast testing device according to claim 4, characterized in that: The lifting device assembly (5) comprises a lifting frame (511) connected to both ends of the counterweight block (122); a cross frame body (512) connected to the electric hoist (413) is provided in the middle of the two lifting frames (511); and continuous sawtooth bodies (513) are provided on the two lifting frames (511) along their height direction; The bearing assembly (6) comprises a swing frame (611) hingedly mounted at both ends of each support frame (411), an L-shaped bearing frame (612) being hingedly mounted on the swing frame (611), one end of the bearing frame (612) being provided with a positioning tooth (613) for clamping the sawtooth body (513), and the other end being provided with a slide groove (614), each slide groove (614) being provided with a sliding block (615) adapted thereto, and two sliding blocks (615) on the same side being hingedly mounted on the T-shaped structure. A telescopic rod (617) is provided between the top surface of the connecting frame (616) and the bottom surface of the supporting frame (411), and mounting frames (618) are provided on the front and rear side surfaces at both ends of each supporting frame (411), and an arc-shaped elastic plate (619) is provided inside the four mounting frames (618) below the connecting frame (616), and a locking assembly (7) for fixing adjacent ends of two supporting frames (612) on the same side is provided on the supporting frame (411).

6. A forklift mast testing device according to claim 5, characterized in that: The locking assembly (7) comprises a fixing seat (711) arranged on each supporting frame (612), a movable pin (712) having a rebound function is inserted into each fixing seat (711), a pin hole for inserting the movable pin (712) is provided on the connecting frame (616), and an adjusting assembly (8) for slidingly controlling the movable pin (712) is provided on the supporting frame 1 (411).

7. A forklift mast testing device according to claim 6, characterized in that: The adjustment assembly (8) comprises a support frame three (811) arranged between two mounting frames (618) on the same side, each of the support frames three (811) is provided with a support body (812) at both ends of the outer side surface, a bidirectional screw rod (813) is provided between the two support bodies (812) on the same side for common rotation, and a sliding rod (814) is provided on the two support bodies (812) on the other side, both ends of the bidirectional screw rod (813) are threaded with a sliding seat (815), both ends of the sliding rod (814) are provided with a movable block (816) matched therewith, and a connecting plate (817) for pushing the movable pin (712) is provided between the sliding seat (815) and the movable block (816) at the same end.

8. A forklift mast testing device according to claim 1, characterized in that: Arc-shaped grooves (115) are provided on both the front and rear sides of the opposite end surfaces of the two lifting seats (112), and an arc-shaped sliding block (116) matching the arc-shaped grooves (115) is fixedly provided on the support seat (113).

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