Tractor lift force test equipment

Abstract

The present invention belongs to the technical field of tractor lift tester, and relates to a lift force testing device for a tractor lift, including a support base, a transmission seat, and a connection mechanism. The connection mechanism includes a connection frame, which is hinged to the transmission seat. A connecting rod is slidably installed on the connection frame. A coarse adjustment mechanism is fixed on the support frame. Two adjustment brackets are respectively rotatably connected to the other end of the transmission seat and the movable rod. Both ends of the dynamometer are respectively connected to the two adjustment brackets. By rotating the nut sleeve to adjust the distance between the nut sleeve and the stop block, that is, when the nut sleeve approaches the stop block, the length of the spring compressed becomes longer, and when the nut sleeve moves away from the stop block, the length of the spring compressed becomes shorter, so that the pulling force of the spring on the pull rod becomes larger or smaller. The initial position of the pull rod does not move. At this time, by driving the end of the transmission seat and the dynamometer to move the same distance through the lifting arm of the tractor lift, the lift force of the lift at the same stroke with different loads can be measured.

Description

Technical Field

[0001] The present invention relates to the technical field of tractor lift testing, in particular to a testing device for the lifting force of a tractor lift. Background Art

[0002] As an important agricultural production tool, the stability and reliability of the performance of a tractor play a crucial role in improving agricultural production efficiency. The tractor lift, as one of the key components of a tractor, its lifting force performance directly affects the operation efficiency and safety of the tractor. Therefore, it is particularly important to accurately and efficiently test the lifting force of the tractor lift. The corresponding testing system mainly meets the testing requirements of various performance indicators in terms of function, including specific tests such as the lifting force at the suspension point, the lifting force on the frame, and static settlement. Specifically, there are four specific functional requirements: First, it is necessary to meet the testing requirements of different horsepower segments. Different horsepower corresponds to different lifting forces, so a reasonable rated lifting force should be set to meet the testing needs of tractors with different horsepower. Second, it is necessary to meet the requirements of different lifting strokes. Different categories correspond to different lifting stroke indicators, and the testing system should be able to meet the testing needs of various different strokes. Third, it is necessary to be compatible with the size requirements of different types of suspension devices. Different types of suspensions have different size requirements, and various types of supporting frames should be configured to meet the testing needs of various suspension devices.

[0003] A patent application with the publication number CN118896714A discloses a testing device for the lifting force of a tractor lift, including a base, a bracket, and multiple groups of guide wheels. The bracket is installed at the top of the base, and multiple groups of guide wheels are all rotatably installed on the bracket; it also includes a connecting device, a load device, multiple groups of traction ropes, a first connecting plate, and a dynamometer. The right ends of multiple groups of traction ropes are all fixed to the connecting device, and the connecting device is used to connect the front ends of multiple groups of traction ropes to the tractor lift arm. The left ends of multiple groups of traction ropes are all connected to the outer wall of the first connecting plate, the right end of the dynamometer is connected to the outer wall of the first connecting plate, and the left end of the dynamometer is installed on the load device. The load device is used to provide a load for the lift arm of the tractor, and the first connecting plate is slidably installed on the load device; it is convenient to perform lifting force tests of different magnitudes on the lift, and improve the convenience of testing the lift with different load weights and ultimate load weights. However, this patent still has some deficiencies: 1. The load device needs to prepare multiple groups of weight blocks and water tanks, and the operations of disassembling and installing weight blocks and filling the water tanks during the lifting force test are very inconvenient. 2. The traction ropes may break during high-load tests, posing a safety hazard. Summary of the Invention

[0004] In order to solve the problem that the existing testing equipment for tractor lifts is not convenient to change the load for lifting force testing, the present invention provides a testing device for the lifting force of a tractor lift.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a lifting force test device for a tractor lift, including a support base, on which a transmission base is rotatably installed. It also includes a connection mechanism, a support frame, a dynamometer, a coarse adjustment mechanism, and a fine adjustment mechanism. The connection mechanism includes a connection frame and two connecting rods. The connection frame is hinged to one end of the transmission base. The two connecting rods are slidably installed at both ends of the connection frame. Threads are provided at the ends of the connecting rods, and the connecting rods are used to connect the tractor lift arms. The support frame is erected on the support base. The coarse adjustment mechanism is fixed to the upper end of the support frame. The coarse adjustment mechanism includes a movable rod. The fine adjustment mechanism includes two symmetrically arranged adjustment brackets, which are respectively rotatably connected to the other end of the transmission base and the movable rod. The two ends of the dynamometer are respectively connected to the two adjustment brackets;

[0006] A pull rod is slidably installed on each adjustment bracket. One end of the pull rod is connected to the dynamometer. A stop block is fixed at the position between the adjustment bracket and the dynamometer on the pull rod. The other end of the pull rod is coaxially and fixedly connected with a screw rod. A nut sleeve is threadedly connected to the screw rod. A thrust spring is abutted between the nut sleeve and the adjustment bracket.

[0007] Preferably, the connection mechanism further includes a sliding seat, an adjustment screw rod, and two synchronizing rods. The two ends of the adjustment screw rod are rotatably installed on the connection frame and located between the two connecting rods. The sliding seat is slidably installed in the middle of the connection frame and is threadedly connected to the adjustment screw rod. The two ends of the synchronizing rod are respectively hinged to the sliding seat and the end of the connecting rod. By rotating the adjustment screw rod, the two connecting rods can be driven to approach or move away from each other.

[0008] Preferably, a support plate is further fixed to the side of the nut sleeve facing the dynamometer. The two ends of the support plate are bent to form legs, and the legs are used to abut against the adjustment bracket.

[0009] Preferably, the coarse adjustment mechanism further includes a top hanging bracket, a telescopic guide rod, and a plurality of tension springs. The top hanging bracket is fixed to the top of the support frame. One end of the telescopic guide rod is rotatably installed on the top hanging bracket, and the other end of the telescopic guide rod is fixedly connected to the middle section of the movable rod. One ends of the plurality of tension springs are rotatably connected to the top hanging bracket, and the other ends of the plurality of tension springs are fixed with hooks, and the hooks can be engaged with the movable rod.

[0010] Preferably, limit seats are further fixed to both sides of the support frame. A limit rod is detachably installed in the limit seat. The limit seat and the limit rod are both arranged below the movable rod, and the limit rod is used to support the movable rod.

[0011] Preferably, an extension support plate is further installed on the support base. One end of the extension support plate is hinged to the support base. A locking rod is horizontally rotatably installed at one end of the support base close to the extension support plate. A lock catch capable of engaging with the locking rod is fixed on the extension support plate. After the extension support plate is unfolded outwards, the locking rod can be toggled to engage with the lock catch.

[0012] The beneficial effect of the present invention lies in that: a fine adjustment mechanism is provided. When testing the lifting force of the lift under low-load conditions, first insert the limit rod into the limit seat, support the movable rod through the limit rod, and then rotate the nut sleeve to adjust the distance between the nut sleeve and the stopper, so as to adjust the load of the lift within a small range. That is, when the nut sleeve approaches the stopper, the compressed length of the spring becomes longer; when the nut sleeve moves away from the stopper, the compressed length of the spring becomes shorter, so that the pulling force of the spring on the pull rod becomes larger or smaller. In the initial state, the stopper fixed on the pull rod always abuts against the adjustment bracket. Therefore, when the pulling force on the pull rod changes, its initial position does not move. At this time, by driving the end of the transmission seat and the dynamometer to move the same distance through the lifting arm of the tractor lift, the lifting force under low-load conditions can be measured when the lift has the same stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 is a schematic structural diagram of the optimal embodiment of the present invention;

[0015] Figure 2 is a schematic structural diagram of the connecting rod of the present invention;

[0016] Figure 3 is a schematic structural diagram of the support base of the present invention;

[0017] Figure 4 is a schematic structural diagram of the support frame of the present invention;

[0018] Figure 5 is a schematic structural diagram of the adjustment bracket of the present invention;

[0019] Figure 6 is a schematic structural diagram of the tension spring of the present invention.

[0020] Reference numerals: 1, support base; 2, transmission seat; 3, connecting mechanism; 4, support frame; 5, dynamometer; 6, coarse adjustment mechanism; 7, fine adjustment mechanism; 8, connecting frame; 9, connecting rod; 10, movable rod; 11, adjusting bracket; 12, sliding seat; 13, adjusting screw; 14, synchronizing rod; 15, pull rod; 16, stop block; 17, latch; 18, nut sleeve; 19, thrust spring; 20, support plate; 21, leg; 22, top hanger; 23, telescopic guide rod; 24, tension spring; 25, hook; 26, limit seat; 27, limit rod; 28, extended support plate; 29, locking rod. Detailed implementation manners

[0021] Next, the technical solutions of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.

[0022] As Figures 1 to 6 shown, the present invention provides an embodiment of a lifting force test device for a tractor lift, including a support base 1, on which a transmission seat 2 is rotatably installed. It also includes a connecting mechanism 3, a support frame 4, a dynamometer 5, a coarse adjustment mechanism 6, and a fine adjustment mechanism 7. The connecting mechanism 3 includes a connecting frame 8 and two connecting rods 9. The connecting frame 8 is hinged to one end of the transmission seat 2, and the two connecting rods 9 are slidably installed at both ends of the connecting frame 8. Threads are provided at the ends of the connecting rods 9, and the connecting rods 9 are used to connect the tractor lift arm. The support frame 4 is erected on the support base 1, and the coarse adjustment mechanism 6 is fixed to the upper end of the support frame 4. The coarse adjustment mechanism 6 includes a movable rod 10. The fine adjustment mechanism 7 includes two mirror-symmetrically arranged adjusting brackets 11, and the two adjusting brackets 11 are respectively rotatably connected to the other end of the transmission seat 2 and the movable rod 10. Both ends of the dynamometer 5 are respectively connected to the two adjusting brackets 11.

[0023] The connecting mechanism 3 further includes a sliding seat 12, an adjusting screw 13, and two synchronizing rods 14. Both ends of the adjusting screw 13 are rotatably installed on the connecting frame 8 and are located between the two connecting rods 9. The sliding seat 12 is slidably installed in the middle of the connecting frame 8 and is threadedly connected to the adjusting screw 13. Both ends of the synchronizing rod 14 are respectively hinged to the sliding seat 12 and the end of the connecting rod 9. By rotating the adjusting screw 13, the two connecting rods 9 can be driven to approach or move away from each other.

[0024] Before testing the lift of the tractor, first fix the connecting rod 9 on the lift arm of the tractor lift. By rotating the adjusting screw 13, the end distance of the two connecting rods 9 can be adjusted so that the connecting rod 9 can be connected to lift arms of different models or different widths.

[0025] A pull rod 15 is slidably mounted on each adjusting bracket 11. One end of the pull rod 15 is connected to a dynamometer 5. A stop block 16 is fixed at a position between the adjusting bracket 11 and the dynamometer 5 on the pull rod 15. The other end of the pull rod 15 is coaxially and fixedly connected to a screw rod, and a nut sleeve 18 is threadedly connected to the screw rod. A thrust spring 19 is abutted between the nut sleeve 18 and the adjusting bracket 11.

[0026] When testing the lifting force of the lift under low-load conditions, first insert the limit rod 27 into the limit seat 26, support the movable rod 10 through the limit rod 27, and then rotate the nut sleeve 18 to adjust the distance between the nut sleeve 18 and the stop block 16, so as to adjust the load of the lift within a small range. That is, when the nut sleeve 18 approaches the stop block 16, the compressed length of the spring becomes longer; when the nut sleeve 18 moves away from the stop block 16, the compressed length of the spring becomes shorter, so that the pulling force of the spring on the pull rod 15 becomes larger or smaller. In the initial state of the pull rod 15, the stop block 16 fixed on the pull rod 15 always abuts against the adjusting bracket 11. Therefore, when the pulling force on the pull rod 15 changes, its initial position will not move. At this time, drive the end of the transmission seat 2 and the dynamometer 5 to move the same distance through the lifting arm of the tractor lift, and the lifting force under low-load conditions can be measured under the condition of the same stroke of the lift.

[0027] A support plate 20 is also fixed on one side of the nut sleeve 18 facing the dynamometer 5. The two ends of the support plate 20 are bent to form legs 21, and the legs 21 are used to abut against the adjusting bracket 11.

[0028] Limit seats 26 are also fixed on both sides of the support frame 4. A limit rod 27 is detachably mounted in the limit seat 26. The limit seat 26 and the limit rod 27 are both arranged below the movable rod 10. The limit rod 27 is used to support the movable rod 10. When testing the lifting force of the lift under low-load conditions, insert the limit rod 27 into the limit seat 26, and remove the hooks 25 of multiple tension springs 24 from the movable rod 10, so that the movable rod 10 falls on the limit rod 27. Support the movable rod 10 through the limit rod 27. At this time, when pulling the dynamometer 5 during the test, only the pull rod 15 can be moved, and the movable rod 10 cannot be moved downward, so as to facilitate the precise adjustment of the stroke of the pull rod 15.

[0029] The coarse adjustment mechanism 6 further includes a top hanger 22, a telescopic guide rod 23 and multiple tension springs 24. The top hanger 22 is fixed at the top end of the support frame 4. One end of the telescopic guide rod 23 is rotatably mounted on the top hanger 22, and the other end of the telescopic guide rod 23 is fixedly connected to the middle section of the movable rod 10. One ends of multiple tension springs 24 are rotatably connected to the top hanger 22, and hooks 25 are fixed at the other ends of multiple tension springs 24, and the hooks 25 can be clamped on the movable rod 10.

[0030] The working principle of the coarse adjustment mechanism 6 is: when testing the lifting force of the lifter under high load conditions, according to the actual required load size, multiple tension springs 24 are engaged one by one on the movable rod 10, and then the limit rod 27 is removed, and the nut sleeve 18 is rotated to make the support leg 21 of the support plate 20 abut against the adjustment bracket 11. At this time, the force generated by the pull rod 15 is directly transmitted to the adjustment bracket 11 through the support plate 20 and the support leg 21, and drives the movable rod 10 to move downward, so that multiple tension springs 24 are stretched, so that the lifter can withstand a higher load within the same stroke, thereby achieving the effect of testing the lifting force under high load conditions of the lifter.

[0031] An extended support plate 28 is also installed on the support base 1, one end of the extended support plate 28 is hinged to the support base 1, and a locking rod 29 is horizontally rotatably installed on the end of the support base 1 close to the extended support plate 28. A lock buckle 17 that can engage with the locking rod 29 is fixed on the extended support plate 28. When the extended support plate 28 is unfolded outward, the locking rod 29 can be moved to engage the locking rod 29 with the lock buckle 17. When testing the lifting force of the lifter under high load conditions, unfolding the extended support plate 28 can make the support base 1 more stable. By engaging the locking rod 29 with the lock buckle 17, the extended support plate 28 and the support base 1 can remain in a locked state, further improving the stability of the support base 1.

[0032] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A tractor lifter lifting force testing device, comprising a support base (1), on which a transmission base (2) is rotatably mounted, characterized in that: It also comprises a connecting mechanism (3), a support frame (4), a tension gauge (5), a coarse adjustment mechanism (6) and a fine adjustment mechanism (7), wherein the connecting mechanism (3) comprises a connecting frame (8) and two connecting rods (9), wherein the connecting frame (8) is hinged to one end of the transmission seat (2), and the two connecting rods (9) are slidably mounted at the two ends of the connecting frame (8), and the ends of the connecting rods (9) are provided with threads, and the connecting rods (9) are used to connect the lifting arm of the tractor, the supporting frame (4) is mounted on the supporting base (1), the coarse adjustment mechanism (6) is fixed to the upper end of the supporting frame (4), the coarse adjustment mechanism (6) comprises a movable rod (10), and the fine adjustment mechanism (7) comprises two adjustment brackets (11) arranged in a mirror-symmetrical manner, and the two adjustment brackets (11) are respectively rotatably connected to the other end of the transmission seat (2) and the movable rod (10), and the two ends of the tension gauge (5) are respectively connected to the two adjustment brackets (11); A pull rod (15) is slidably mounted on each of the adjustment brackets (11), one end of the pull rod (15) is connected to the dynamometer (5), a stopper (16) is fixed on the pull rod (15) at a position between the adjustment bracket (11) and the dynamometer (5), the other end of the pull rod (15) is coaxially fixedly connected to a screw rod, a nut sleeve (18) is threadedly connected to the screw rod, and a thrust spring (19) is abutted between the nut sleeve (18) and the adjustment bracket (11); The coarse adjustment mechanism (6) further comprises a top hanger (22), a telescopic guide rod (23) and a plurality of tension springs (24); the top hanger (22) is fixed to the top of the support frame (4); one end of the telescopic guide rod (23) is rotatably mounted on the top hanger (22); the other end of the telescopic guide rod (23) is fixedly connected to the middle section of the movable rod (10); one end of the plurality of tension springs (24) is rotatably connected to the top hanger (22); the other end of the plurality of tension springs (24) is fixedly provided with a hook (25); and the hook (25) can be engaged with the movable rod (10).

2. The tractor lifter lifting force testing device according to claim 1, characterized in that: The connecting mechanism (3) further comprises a sliding seat (12), an adjusting screw (13) and two synchronous rods (14); the two ends of the adjusting screw (13) are rotatably mounted on the connecting frame (8) and are located between the two connecting rods (9); the sliding seat (12) is slidably mounted in the middle of the connecting frame (8) and is threadedly connected to the adjusting screw (13); the two ends of the synchronous rod (14) are respectively hinged to the sliding seat (12) and the end of the connecting rod (9); and the two connecting rods (9) can be driven to move closer to or farther from each other by the rotation of the adjusting screw (13).

3. The tractor lifter lifting force testing device according to claim 1, characterized in that: A support plate (20) is also fixed to the side of the nut sleeve (18) facing the dynamometer (5), and two ends of the support plate (20) are bent to form supporting legs (21), and the supporting legs (21) are used to abut against the adjustment bracket (11).

4. The tractor lifter lifting force testing device according to claim 1, characterized in that: Limiting seats (26) are also fixed on both sides of the support frame (4), and limiting rods (27) are detachably installed in the limiting seats (26). The limiting seats (26) and the limiting rods (27) are both arranged below the movable rod (10), and the limiting rods (27) are used to support the movable rod (10).

5. The tractor lifter lifting force testing device according to claim 1, characterized in that: An extended support plate (28) is also mounted on the support base (1), one end of the extended support plate (28) is hinged to the support base (1), a locking rod (29) is mounted horizontally and rotatably on one end of the support base (1) close to the extended support plate (28), a locking buckle (17) capable of engaging with the locking rod (29) is fixed on the extended support plate (28), and when the extended support plate (28) is unfolded outward, the locking rod (29) can be moved to engage with the locking buckle (17).

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