Jack test bench

Abstract

The invention discloses a jack test bench, which belongs to the technical field of jack testing and comprises a portal frame, a lifting beam and a driving assembly. The portal frame comprises a base, two stand columns and a top beam, and a plurality of first bolt holes are formed in the stand columns in the height direction. The two ends of the lifting beam are provided with an executing mechanism, a plug pin and a second plug pin hole respectively, the second plug pin hole is formed in the lifting beam and can be opposite to the first plug pin hole, and the moving stroke of the plug pin is limited in a channel formed when the first plug pin hole communicates with the second plug pin hole. The test bed drives the lifting beam to lift up and down in the portal frame through the driving assembly, when the lifting beam lifts to a set position, the plug pins can be driven to stretch out through the execution mechanism to be limited between the first plug pin holes and the second plug pin holes, the internal force of the lifting beam is converted into the internal force of the two stand columns, the stress of the lead screw is remarkably reduced, and the test efficiency is improved. The lead screw structure is effectively protected, and anti-falling protection is provided in the loading process.

Description

Technical Field

[0001] The invention belongs to the technical field of jack testing, in particular to a jack test bench. Background Art

[0002] As a tool for lifting heavy objects, jacks are widely used in engineering machinery, building construction, bridge maintenance and other fields. In order to ensure the working stability, safety and service life of the jack, it is necessary to conduct a variety of performance tests, including load-bearing capacity, hydraulic performance, durability and sealing performance. The jack test bench is a specially designed device that can be used to test the various performance parameters of the jack. The data such as compression resistance, deformation, and sealing are obtained during the dynamic loading process of the jack.

[0003] The conventional jack test bench includes a gantry, a drive assembly and a loading mechanism. The drive assembly drives the loading mechanism to move along a predetermined route on the gantry, thereby loading the jack at the bottom of the loading mechanism. Through the automated working condition simulation loading of the jack test bench, the working state of the jack under load can be comprehensively simulated.

[0004] However, due to the strong load capacity of some large jacks, the required test bench size also increases accordingly. In the jack test bench that can achieve a load of hundreds of tons, the weight of the loading mechanism itself is quite large. In addition, the test bench lacks safety measures and protection mechanisms, which brings many safety hazards. For example, the drive component used to drive and support the loading mechanism will be repeatedly subjected to forces from both the upper and lower directions of the loading mechanism (the loading mechanism is subjected to the positive force or bending moment generated by the gravity of the loading mechanism when it is not loaded, and the reverse force or bending moment generated by the reverse action of the jack on the loading mechanism during loading), which may cause the drive component to fail, resulting in a safety accident caused by the loading mechanism falling. Summary of the invention

[0005] The object of the present invention is to provide a jack test bench, which has solved the problems raised in the above-mentioned prior art.

[0006] A jack test bench is provided, comprising:

[0007] The gantry comprises a base, two columns and a top beam, wherein the base and the top beam are fixedly connected via two columns, and the columns are provided with a plurality of first pin holes along a height direction;

[0008] A lifting beam, the lifting beam is located between two columns, and limit assemblies are respectively provided at both ends of the lifting beam, the limit assemblies include an actuator, a latch and a second latch hole, the cylinder body of the actuator is fixedly connected to the lifting beam, and the output shaft of the actuator is fixedly connected to the latch, the second latch hole is formed inside the lifting beam and can be arranged opposite to the first latch hole, and the moving stroke of the latch is limited to the inside of a channel formed when the first latch hole is connected to the second latch hole;

[0009] A driving assembly is used to drive the lifting beam to move along the height direction of the column.

[0010] As a further solution of the present invention: the driving assembly includes a motor, a transmission assembly, two screw rods and two nut assemblies, the motor is connected to the screw rod through the transmission assembly, and the two ends of the lifting beam are connected to the corresponding screw rods through the nut assemblies. The two screw rods are arranged on both sides of the gantry, and the motor can drive the two screw rods to rotate synchronously through the transmission assembly, and then drive the lifting beam to rise and fall through the two nut assemblies, avoiding interference between the two ends of the lifting beam and the screw rod due to asynchronous travel.

[0011] As a further solution of the present invention: the transmission assembly includes a bidirectional reducer, two synchronous shafts and two commutators, the motor is connected to the two synchronous shafts through the two output shafts of the bidirectional reducer, the two synchronous shafts extend to the two ends of the top beam in the top beam, and the two synchronous shafts are connected to the corresponding screw rods through the commutators. The bidirectional reducer has two output shafts that drive the two synchronous shafts to rotate respectively, and can increase the output torque. The commutator is used to change the torque output direction of the synchronous shaft, so that the synchronous shaft is arranged vertically with the screw rod, and the synchronous shaft is hidden in the top beam, making full use of the gantry space.

[0012] As a further solution of the present invention: the nut assembly includes a working nut and a safety nut which are threadedly connected to the screw rod from top to bottom in sequence, and the working nut and the safety nut are mutually limited by a toothed boss and a toothed groove and are spaced a certain distance apart. When the working nut and the screw rod work normally, the working nut bears the load, and the safety nut moves synchronously with the working nut on the screw rod through the limiting effect of the tooth shape. When the working nut fails due to wear, it is synchronously switched to the safety nut to work and bear the load, ensuring that the working nut will not cause structural failure at the nut level after wear, resulting in safety accidents such as falling.

[0013] As a further solution of the present invention: a detection switch is provided between the working nut and the safety nut. When the working nut wears and gradually falls, the detection switch can sense that the working nut and the safety nut have reached a safety warning distance, and then generate an alarm to warn that the working nut needs to be replaced, without the need for personnel to observe the distance between the working nut and the safety nut with naked eyes.

[0014] As a further solution of the present invention: the lifting beam and the nut assembly are connected via a floating spring seat, and the lifting beam has an up and down floating stroke relative to the nut assembly in the height direction due to the elastic action of the floating spring seat. The floating spring seat can establish a soft connection between the lifting beam and the nut assembly. When the lifting beam load is subjected to a reverse force, the deformation of the floating spring seat can greatly reduce the internal stress of the nut assembly from the lifting beam, and almost all of the internal stress is transferred to the column, thereby protecting the screw rod.

[0015] As a further solution of the present invention, the output front end edge of the bolt is provided with a chamfer. The chamfer can make the bolt self-adapt to the hole position of the first bolt hole, so that the bolt can slide into the first bolt hole naturally without interference. At the same time, even if there is a positioning error between the bolt and the first bolt hole, the floating spring seat can float up and down to prevent the two from interfering with each other and failing to cooperate.

[0016] As a further solution of the present invention: the floating spring seat includes a connecting plate, a plurality of springs and a plurality of support rods, the connecting plate is fixedly connected to the nut assembly, a plurality of the support rods movably penetrate the connecting plate, one end of the support rod is fixedly connected to the lifting beam and a limiting block is arranged at the other end, the spring is clamped between the lifting beam and the connecting plate, and the spring is clamped between the connecting plate and the limiting block.

[0017] As a further solution of the present invention: there are at least three structural facing surfaces between one end of the lifting beam and the column, and the lifting beam is provided with a plurality of guide wheels respectively contacting with the structural facing surfaces on the column. The lifting beam and at least three side wall surfaces of the column are guided and limited by the guide wheels to ensure the stable operation of the lifting beam in the vertical direction and avoid lateral force on the screw rod.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The test bench drives the lifting beam up and down in the gantry through the driving assembly. When the lifting beam is lifted to the set position, the actuator can be used to drive the pin to extend so that the pin is limited to the first pin hole and the second pin hole. At this time, the loading process of the lifting beam is to convert the internal force of the lifting beam into the internal force of the two columns, which significantly reduces the force on the screw rod, effectively protects the screw rod structure, and provides anti-fall protection during the loading process.

[0020] 2. Since the column has multiple first latch holes in height, the lifting beam can be roughly adjusted in height first and then establish latch limits with the first latch holes at the corresponding heights. Then, the oil cylinder on the loading end of the lifting beam is extended to make fine height adjustments and contact with the jack, which has the function of safe locking at any height. During the test of the test bench, the forces between the lifting beam and the jack are converted into the internal forces of the gantry, and the test pressure is not directly applied to the ground, which effectively protects the ground structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of a jack test bench;

[0023] Figure 2 A diagram showing the matching structure of the latch and the latch hole provided by the present invention;

[0024] Figure 3 A partial structural cross-sectional view of the gantry provided by the present invention;

[0025] Figure 4 It is a schematic diagram of the matching structure between the lifting beam and the floating spring seat;

[0026] Figure 5 for Figure 4 A magnified image of area A;

[0027] Figure 6 This is an assembly structure diagram of the guide wheel provided by the present invention.

[0028] In the figure: 1. gantry; 11. base; 12. column; 121. first latch hole; 13. top beam; 2. lifting beam; 211. actuator; 212. latch; 213. second latch hole; 22. guide wheel; 3. drive assembly; 31. motor; 32. transmission assembly; 321. bidirectional reducer; 322. synchronous shaft; 323. commutator; 33. screw rod; 34. nut assembly; 341. working nut; 342. safety nut; 4. floating spring seat; 41. connecting plate; 42. spring; 43. support rod; 431. limit block. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0030] Obviously, the drawings described below are only some examples or embodiments of the present invention. For ordinary technicians in this field, the present invention can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed by the present invention, some changes in design, manufacturing or production based on the technical content disclosed by the present invention are just conventional technical means, and should not be understood as insufficient content disclosed by the present invention.

[0031] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present invention and are not intended to limit the subject matter described in the claims.

[0032] See also Figure 1-2 As shown, in an embodiment of the present invention, a jack test bench includes a gantry 1, a lifting beam 2 and a driving assembly 3. The gantry 1 includes a base 11, two columns 12 and a top beam 13. The base 11 and the top beam 13 are fixedly connected by two columns 12. The columns 12 are provided with a plurality of first latch holes 121 along the height direction. The lifting beam 2 is located between the two columns 12. The two ends of the lifting beam 2 are respectively provided with a limit assembly. The limit assembly includes an actuator 211, a latch 212 and a second latch hole 213. The cylinder body of the actuator 211 is fixedly connected to the lifting beam 2 and the output shaft of the actuator 211 is fixedly connected to the latch 212. The second latch hole 213 is formed inside the lifting beam 2 and can be arranged opposite to the first latch hole 121. The moving stroke of the latch 212 is limited to the inside of the channel formed when the first latch hole 121 is connected to the second latch hole 213. The driving assembly 3 is used to drive the lifting beam 2 to move along the height direction of the column 12.

[0033] The gantry 1 forms a frame structure through a base 11, two columns 12 and a top beam 13. The two columns 12 are respectively located at the two ends of the base 11 and the top beam 13. The jack is placed on the base 11 for testing, so that the force during the test is converted into the internal force of the gantry 1, and no pressure is directly applied to the ground, thereby protecting the ground structure from damage.

[0034] During the test, the driving assembly 3 drives the lifting beam 2 to move along the height direction of the column 12, and the lifting height of the lifting beam 2 is controlled according to the size of the jack. Since the first latch hole 121 on the column 12 is intermittently arranged, the lifting and lowering of the lifting beam 2 is a rough adjustment. After reaching the appropriate position, the actuator 211 drives the latch 212 to extend from the second latch hole 213, and the latch 212 is stopped between the first latch hole 121 and the second latch hole 213 as a shear pin to support the lifting beam 2, ensuring that the driving assembly 3 is not subjected to force when the lifting beam 2 is loaded, but converted into the internal force of the gantry 1, to avoid the lifting beam 2 falling due to the failure of the driving assembly 3 and causing a safety accident. A cylinder is provided at the middle loading end of the lifting beam 2. After the lifting height of the lifting beam 2 is roughly adjusted, the cylinder extends the output end to load the jack. A pressure sensor is provided at the output front end of the cylinder, which can output pressure data in real time.

[0035] Specifically, see Figure 1 and Figure 3 As shown, the driving assembly 3 includes a motor 31, a transmission assembly 32, two screw rods 33 and two nut assemblies 34. The two screw rods 33 are respectively located on both sides of the gantry 1, and the two ends of the lifting beam 2 are respectively threadedly connected to the screw rods 33 through the nut assemblies 34. After the motor 31 is started, the transmission action of the transmission assembly 32 drives the screw rods 33 on both sides to rotate, thereby driving the lifting beam 2 to rise and fall.

[0036] The transmission assembly 32 includes a bidirectional reducer 321, two synchronous shafts 322 and two commutators 323. The bidirectional reducer 321 has two output shafts, which are used to reduce the input speed of the motor 31 and increase the torque to be output from the two output shafts respectively. The commutator 323 has a gear assembly inside, which changes the output direction of the torque through the transmission of the gears. The two output shafts of the bidirectional reducer 321 respectively drive the two synchronous shafts 322 to rotate, and the synchronous shaft 322 drives the screw rod 33 to rotate after changing the torque direction through the commutator 323, thereby realizing that one motor 31 drives the two screw rods 33 to rotate synchronously. The entire transmission part is limited to the top beam 13 structure, and does not occupy additional space on the gantry 1, thereby retaining the lifting height of the lifting beam 2 to the greatest extent.

[0037] See also Figure 3-Figure 5As shown, the nut assembly 34 includes a working nut 341 and a safety nut 342 which are threadedly connected to the screw rod 33 from top to bottom. The working nut 341 is located at a high position of the screw rod 33 relative to the safety nut 342. The working nut 341 and the safety nut 342 are mutually limited by the toothed boss and the toothed groove and are spaced a certain distance apart. Under normal use, the working nut 341 carries the lifting beam 2 to lift and lower. When the working nut 341 rotates under the action of the thread, the safety nut 342 is driven to rotate and lift synchronously through the limiting action of the toothed groove and the toothed boss. At the same time, the safety nut 342 will not rotate by itself because of the limiting action of the toothed groove and the toothed boss. When the working nut 341 sinks relative to the screw rod 33 due to wear, the gap between the working nut 341 and the safety nut 342 is shortened, and it can be judged whether the working nut 341 needs to be replaced by observing the gap distance. In addition, if the working nut 341 suddenly fails in structure, the lifting beam 2 and the working nut 341 are integrally mounted on the safety nut 342, and the threaded structure of the safety nut 342 continues to maintain the lifting beam 2 to prevent the lifting beam 2 from falling, thereby playing an anti-fall protection role.

[0038] Furthermore, a detection switch is provided between the working nut 341 and the safety nut 342. The detection switch may use a pressure sensor, a photoelectric sensor, a proximity switch, etc., to detect the distance between the working nut 341 and the safety nut 342, determine the degree of wear of the working nut 341, and determine whether the working nut 341 needs to be replaced. The detection switch may be connected to an alarm, and the alarm sounds when the detection switch is triggered, prompting the staff to inspect the working nut 341.

[0039] The lifting beam 2 is connected to the nut assembly 34 through the floating spring seat 4, and the floating spring seat 4 is elastic, so that a soft connection is formed between the lifting beam 2 and the nut assembly 34. When the lifting beam 2 is in a lifting state, the lifting beam 2 is pressed on the floating spring seat 4, and the floating spring seat 4 is in a compressed state. When the lifting beam 2 is hard-connected with the column 12 through the latch 212, the column 12 is the floating spring seat 4 that bears part of the gravity of the lifting beam 2. When the lifting beam 2 is loaded, the lifting beam 2 is subjected to the reverse force of the jack, and the floating spring seat 4 changes from a compressed state to a state with a tendency to release the compressive force. However, due to the large degree of compression deformation of the floating spring seat 4, the lifting beam 2 is almost invisible, so the reverse force of the lifting beam 2 will not cause a reverse action between the nut assembly 34 and the screw rod 33, and the internal force of the lifting beam 2 during loading is all transmitted to the column 12, forming a protection for the screw rod 33.

[0040] Furthermore, the floating spring seat 4 includes a connecting plate 41, a plurality of springs 42 and a plurality of support rods 43. The connecting plate 41 is fixedly connected to the nut assembly 34, specifically to the working nut 341 in the nut assembly 34. A plurality of support rods 43 movably penetrate the connecting plate 41, one end of the support rod 43 is fixedly connected to the lifting beam 2 and the other end is provided with a limit block 431, and the springs 42 are clamped between the lifting beam 2 and the connecting plate 41 and between the connecting plate 41 and the limit block 431. When the nut assembly 34 and the connecting plate 41 are stationary, the lifting beam 2 can have an up and down floating stroke through the springs 42 on both sides of the connecting plate 41.

[0041] The spring 42 on the upper side of the connecting plate 41 is in a compressed state, and the spring 42 on the lower side of the connecting plate 41 is in a tensile state. The springs 42 on both sides can balance the pressure of the lifting beam 2 and reduce the load of the springs 42 on each side. By arranging the springs 42 on both sides of the connecting plate 41, the distance between the lifting beam 2 and the connecting plate 41 can be shortened without affecting the floating stroke of the lifting beam 2, thereby reducing the height of the spring 42 on the upper side of the connecting plate 41, avoiding the increase of the deflection of the upper spring 42 due to the excessive height, improving the stability of the spring 42 structure, and reducing the risk of the lifting beam 2 tipping sideways.

[0042] There is a clearance fit between the latch 212 and the first latch hole 121, and the best fit form is a close fit with the clearance approaching zero, so as to ensure that the internal force of the lifting beam 2 is fully transmitted to the column 12. However, since the lifting height of the lifting beam 2 is affected by the transmission accuracy, it is impossible to ensure that the landing point of the latch 212 is accurately corresponding to the first latch hole 121 each time, and there is a matching interference problem caused by the error between the two. Therefore, a chamfer is set at the output front edge of the latch 212. After the chamfer of the latch 212 contacts the edge of the first latch hole 121, the latch 212 can naturally slide into the first latch hole 121 through the inclined chamfered surface, solving the interference problem caused by the error. In addition, since the lifting beam 2 has an up and down floating stroke through the floating spring seat 4, the latch 212 will drive the lifting beam 2 to float in the process of matching with the first latch hole 121 through the chamfer, thereby realizing the adaptive matching between the lifting beam 2 and the first latch hole 121.

[0043] See also Figure 3 and Figure 6 As shown, there are at least three structural facing surfaces between one end of the lifting beam 2 and the column 12, that is, the lifting beam 2 forms at least three structural surrounding surfaces outside the column 12. The lifting beam 2 is provided with a plurality of guide wheels 22 on the three structural surfaces, and the guide wheels 22 are in contact with the column 12 to ensure that the lifting beam 2 is stably lifted and lowered, and to prevent the lifting beam 2 from lateral vibration, which causes lateral force on the screw rod 33.

[0044] It should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present invention are all included in the technical scope of the present invention. In addition, without departing from the scope of the main purpose of the present invention, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. A jack test bench, characterized in that: include: A gantry (1) comprises a base (11), two columns (12) and a top beam (13); the base (11) and the top beam (13) are fixedly connected via the two columns (12); the columns (12) are provided with a plurality of first latch holes (121) along a height direction; A lifting beam (2), the lifting beam (2) being located between two uprights (12), and having limit assemblies respectively disposed at both ends of the lifting beam (2), the limit assemblies comprising an actuator (211), a latch (212) and a second latch hole (213), the cylinder body of the actuator (211) being fixedly connected to the lifting beam (2) and the output shaft of the actuator (211) being fixedly connected to the latch (212), the second latch hole (213) being formed inside the lifting beam (2) and being arranged opposite to the first latch hole (121), and the moving stroke of the latch (212) being limited to the inside of a channel formed when the first latch hole (121) and the second latch hole (213) are connected; A driving assembly (3) is used to drive the lifting beam (2) to move along the height direction of the column (12).

2. A jack test bench according to claim 1, characterized in that: The driving assembly (3) comprises a motor (31), a transmission assembly (32), two screw rods (33) and two nut assemblies (34); the motor (31) is transmission-connected to the screw rod (33) via the transmission assembly (32); and the two ends of the lifting beam (2) are transmission-connected to the corresponding screw rods (33) via the nut assemblies (34).

3. A jack test bench according to claim 2, characterized in that: The transmission assembly (32) comprises a bidirectional reducer (321), two synchronous shafts (322) and two commutators (323); the motor (31) is respectively connected to the two synchronous shafts (322) via two output shafts of the bidirectional reducer (321); the two synchronous shafts (322) extend inside the top beam (13) to two ends of the top beam (13); and the two synchronous shafts (322) are respectively connected to the corresponding screw rods (33) via the commutators (323).

4. A jack test bench according to claim 2, characterized in that: The nut assembly (34) comprises a working nut (341) and a safety nut (342) which are threadedly connected to the screw rod (33) from top to bottom in sequence. The working nut (341) and the safety nut (342) are mutually limited and spaced a certain distance apart by a toothed boss and a toothed groove.

5. A jack test bench according to claim 4, characterized in that: A detection switch is provided between the working nut (341) and the safety nut (342).

6. A jack test bench according to claim 2, characterized in that: The lifting beam (2) and the nut assembly (34) are connected via a floating spring seat (4); the lifting beam (2) has an up and down floating stroke relative to the nut assembly (34) in the height direction due to the elastic action of the floating spring seat (4).

7. A jack test bench according to claim 6, characterized in that: The output front end edge of the latch (212) is provided with a chamfer.

8. The jack test bench according to claim 6, characterized in that: The floating spring seat (4) comprises a connecting plate (41), a plurality of springs (42) and a plurality of support rods (43); the connecting plate (41) is fixedly connected to the nut assembly (34); the plurality of support rods (43) movably penetrate the connecting plate (41); one end of the support rod (43) is fixedly connected to the lifting beam (2) and the other end is provided with a limit block (431); the spring (42) is clamped between the lifting beam (2) and the connecting plate (41); and the spring (42) is clamped between the connecting plate (41) and the limit block (431).

9. The jack test bench according to claim 1, characterized in that: There are at least three structural facing surfaces between one end of the lifting beam (2) and the column (12), and a plurality of guide wheels (22) are provided on the lifting beam (2) and are respectively in contact with each structural facing surface on the column (12).

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