Hydraulic oil cylinder and performance testing device thereof

Abstract

The invention relates to the technical field of hydraulic oil cylinder detection, in particular to a hydraulic oil cylinder and a performance testing device thereof, which comprises a support frame, a support sliding plate, a bearing mechanism, a clamping mechanism, a vibration mechanism and a counterweight loading and unloading mechanism. According to the hydraulic oil cylinder and the performance testing device thereof provided by the invention, the clamping mechanism, the bearing mechanism, the counterweight loading and unloading mechanism and the vibration mechanism are matched, after the hydraulic oil cylinder is limited and clamped, a convex bearing plate is divided into a non-full-load state, a full-load state and an overload state by adopting a mode of increasing a plurality of counterweight plates step by step, so that the performance of the hydraulic oil cylinder is improved. And during the period, the hydraulic oil cylinder can be driven to vibrate to simulate the complex working condition in the actual work of the crane, so that the test efficiency and the diversity and accuracy of the test are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic cylinder detection, and particularly relates to a hydraulic cylinder and its performance testing device. Background Art

[0002] In a crane, a hydraulic cylinder, as a core power component, is mainly responsible for lifting and lowering loads. The design of the hydraulic system and the performance of the hydraulic cylinder will affect the working efficiency, lifting capacity, and operating stability of the crane. For the hydraulic cylinder of a crane, performance testing is an important link to ensure the safety and reliability of the equipment, and the load-bearing capacity test and durability test are crucial.

[0003] Existing testing devices can usually only perform conventional stroke tests, pressure resistance tests, and leakage tests on hydraulic cylinders, and often involve multiple steps and manual operations. Real-time data cannot be obtained quickly, resulting in an overly long entire test cycle, and it is difficult to fully simulate the complex working conditions where different loads of heavy objects need to be lifted during the actual operation of the crane and there may be vibrations of the hydraulic cylinder and swaying of the heavy objects when moving. In addition, too much manual intervention may affect the accuracy of the test. Summary of the Invention

[0004] Technical problems to be solved: A hydraulic cylinder performance testing device provided by the present invention can solve the above-mentioned problems.

[0005] Technical solution: To achieve the above object, the present invention adopts the following technical solution. A hydraulic cylinder performance testing device, the hydraulic cylinder consists of a cylinder body and a telescopic end. Mounting seats with preset mounting round holes are installed on both the cylinder body and the telescopic end of the hydraulic cylinder. The performance testing device includes a support frame. A support sliding plate is slidably installed on the lower side inside the support frame. A load-bearing mechanism is arranged on the support frame. A clamping mechanism is jointly arranged on the support sliding plate and the load-bearing mechanism. A vibration mechanism is jointly arranged on the support frame and the support sliding plate. A counterweight loading and unloading mechanism is also arranged on the support frame.

[0006] The load-bearing mechanism includes rectangular through holes opened at both the front and rear ends of the support frame. A convex load-bearing plate is slidably installed jointly in the front and rear two rectangular through holes. Ball bearings are installed at the positions corresponding to the rectangular through holes on the side walls of the left and right ends of the convex load-bearing plate. A protection part is arranged on the convex load-bearing plate. The clamping mechanism includes a trapezoidal cushion plate installed at the upper end of the support sliding plate. Two front and rear guiding sliding holes are opened on the upper end of the support sliding plate to the left of the trapezoidal cushion plate. A clamping part one is arranged on the support sliding plate at the positions corresponding to the two front and rear guiding sliding holes. A clamping part two is arranged at the lower end of the convex load-bearing plate. The counterweight loading and unloading mechanism includes a loading and unloading port opened at the upper end of the support frame corresponding to the convex load-bearing plate. A U-shaped guard plate is installed at the upper end of the support frame corresponding to the loading and unloading port. A pushing part and a jacking part are respectively arranged at the upper end of the support frame to the left of the U-shaped guard plate. A pushing-out part is arranged at the upper end of the support frame to the right of the U-shaped guard plate.

[0007] Preferably, the vibration mechanism includes a plurality of rectangular seats installed at the upper end of the inner wall of the bottom end of the support frame, which are evenly distributed in a rectangle. The lower end of the support sliding plate is connected to the inner wall of the bottom end of the support frame through a plurality of support springs. A plurality of avoidance openings are formed in a rectangular distribution at the bottom end of the support frame. A vibration part is jointly arranged on the support sliding plate and the support frame.

[0008] Preferably, the first clamping part includes clamping seats slidably installed on the closer sides of the front and rear guiding sliding holes. A first limiting rod is installed at the front end of the rear clamping seat. A circular alignment groove is formed at the position corresponding to the first limiting rod at the rear end of the front clamping seat. A plurality of balls evenly distributed in a circle are installed at the opposite ends of the front and rear clamping seats. Bearing seats one are symmetrically installed at the positions corresponding to the front and rear guiding sliding holes at the lower end of the support sliding plate. The opposite ends of the front and rear bearing seats one are rotatably installed with first lead screws. The first lead screws penetrate through the clamping seats and are threadedly connected to the clamping seats. First bevel gears are installed at the opposite ends of the front and rear first lead screws. A bearing seat two is installed on the left side of the lower end of the support sliding plate. A rotating shaft is rotatably installed through the left and right bearing seats two. A second bevel gear is installed at the right end of the rotating shaft. The front and rear first bevel gears are both meshed with the second bevel gear. A forward and reverse motor is installed on the left end of the bearing seat two through a motor seat. The output shaft of the forward and reverse motor is fixedly connected to the rotating shaft.

[0009] Preferably, the second clamping part includes front and rear support vertical plates installed at the lower end of the convex load-bearing plate. Circular sliding holes are formed in the upper sides of the front and rear support vertical plates. The diameter of the circular sliding hole at the front side is larger than that of the circular sliding hole at the rear side. A second limiting rod is movably arranged in the circular sliding hole at the rear side. An installation cylinder with an opening facing forward is movably arranged in the circular sliding hole at the front side. The front end of the second limiting rod is fixedly connected to the installation cylinder. A bearing seat three is installed on the front side of the lower end of the convex load-bearing plate. A second lead screw is rotatably installed through the bearing seat three. The rear side of the second lead screw is threadedly connected to the installation cylinder, and a hand wheel is installed at the front end of the second lead screw.

[0010] Preferably, the pushing part includes a baffle plate installed on the upper side of the left end of the U-shaped guard plate. L-shaped baffle plates are symmetrically installed at the front and rear of the upper end of the support frame. The right ends of the front and rear L-shaped baffle plates are fixedly connected to the baffle plate. Rectangular accommodation openings are formed at the positions between the front and rear L-shaped baffle plates at the upper end of the support frame.

[0011] Preferably, the jacking part includes a support cross plate commonly installed on the upper sides of the inner walls at the front and rear ends of the support frame. On the upper left side of the support cross plate, two front and rear support sliding rods are installed. On the upper end of the support cross plate, three lead screws are rotatably installed on the right sides of the two front and rear support sliding rods. The two front and rear lead screws are respectively threadedly connected with rectangular top plates. The two front and rear support sliding rods respectively slide through the corresponding rectangular top plates, and limit circular plates for limiting the rectangular top plates are installed on the upper ends of the two support sliding rods and the two lead screws. A servo motor is installed at the lower end of the support cross plate. The output shaft of the servo motor rotates through the support cross plate and is fixedly connected to any one of the lead screws. The two front and rear lead screws are connected by a transmission belt.

[0012] Preferably, the vibration part includes a first transmission shaft rotatably installed on the inner walls at the front and rear ends of the support frame at positions corresponding to the left avoidance openings, and a second transmission shaft rotatably installed on the inner walls at the front and rear ends of the support frame at positions corresponding to the right avoidance openings. At positions corresponding to the avoidance openings, cams are fixedly sleeved on the two front and rear first transmission shafts and the second transmission shaft. The multiple cams are all in rolling contact with the support sliding plate. A transmission belt is connected between the left front first transmission shaft and the second transmission shaft. A double-shaft motor is installed on the inner wall at the bottom end of the support frame through a motor seat. The two front and rear output shafts of the double-shaft motor are respectively fixedly connected to the corresponding first transmission shafts.

[0013] Preferably, the protection part includes a plurality of rectangular columns uniformly distributed in a rectangle and penetratingly installed on the convex load-bearing plate. L-shaped through holes are commonly opened at the upper ends of the plurality of rectangular columns. L-shaped vertical plates are slidably connected in the plurality of L-shaped through holes through compression springs.

[0014] Preferably, the pushing part further includes a plurality of balls uniformly installed at the position between the two L-shaped baffles at the upper end of the support frame. A hydraulic push rod I is installed on the upper left side of the support frame through a mounting seat. The telescopic end of the hydraulic push rod I is installed with a U-shaped pushing plate. The plurality of balls are all in rolling contact with the lower end surface of the U-shaped pushing plate.

[0015] Preferably, the pushing-out part includes a plurality of balls uniformly installed at the right side of the U-shaped guard plate at the upper end of the support frame. A hydraulic push rod II is installed on the upper right side of the support frame through a mounting seat. The telescopic end of the hydraulic push rod II is installed with a material pushing seat. The plurality of balls on the right side are all in rolling contact with the lower end surface of the material pushing seat.

[0016] Beneficial effects: 1. The clamping mechanism, load-bearing mechanism and counterweight loading and unloading mechanism adopted by the hydraulic cylinder performance testing device provided by the present invention cooperate to limit and clamp the cylinder body and the telescopic end of the hydraulic cylinder in sequence. Moreover, the cylinder body of the hydraulic cylinder can freely rotate around the first limiting rod, the clamping is convenient and fast, and a plurality of counterweight plates are moved to the upper end of the convex load-bearing plate, and the problem that the position of the counterweight plate shifts during reciprocating lifting can be prevented, so as to complete the durability test of the hydraulic cylinder in the unloaded state in actual application.

[0017] 2. The load-bearing mechanism and counterweight loading and unloading mechanism used in the hydraulic cylinder performance testing device provided by the present invention can cooperate to continue to add multiple counterweight plates to the convex load-bearing plate to make it in a fully loaded state, thereby completing the durability test of the hydraulic cylinder simulating the full-load state in actual application. In the durability test in the not-fully-loaded state and the not-fully-loaded state, the vibration mechanism can simulate the complex working conditions of the crane that needs to move when lifting heavy objects of different loads in actual work, and there may be small-amplitude hydraulic cylinder vibration and heavy object shaking, effectively improving the accuracy of the test results.

[0018] 3. The clamping mechanism, load-bearing mechanism, counterweight loading and unloading mechanism and vibration mechanism used in the hydraulic cylinder performance testing device provided by the present invention cooperate with each other. After the hydraulic cylinder is limited and clamped, a plurality of counterweight plates are added step by step to divide the convex load-bearing plate into three states: underloaded, fully loaded and overloaded. Two durability tests of underloaded and fully loaded and an overloaded overpressure test are performed respectively. During the test, the hydraulic cylinder can also be driven to vibrate to simulate the complex working conditions of the actual crane operation, effectively improving the test efficiency as well as the diversity and accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a first three-dimensional structural schematic diagram of the present invention.

[0021] Figure 2 It is a second three-dimensional structural schematic diagram of the present invention.

[0022] Figure 3 It is a schematic diagram of the first partially cutaway three-dimensional structure of the present invention (excluding the counterweight loading and unloading mechanism).

[0023] Figure 4 The present invention Figure 3 Enlarged view of the X in the middle.

[0024] Figure 5 It is a schematic diagram of a second partially cutaway three-dimensional structure of the present invention.

[0025] Figure 6 It is a partially cutaway three-dimensional structural schematic diagram of the counterweight loading and unloading mechanism in the present invention.

[0026] Figure 7 It is a schematic diagram of the partial cross-section three-dimensional structure of the rectangular receiving opening and the rectangular top plate in the present invention.

[0027] Figure 8 It is a schematic diagram of the partial cross-section of the three-dimensional structure of the load-bearing mechanism in the present invention.

[0028] Fig. 9It is a partial sectional three-dimensional structural schematic diagram of a clamping part in the present invention (the second bearing seat is removed).

[0029] In the figure: 1. Support frame; 2. Support slide plate; 3. Load-bearing mechanism; 31. Rectangular through hole; 32. Convex load-bearing plate; 33. Protection part; 331. Rectangular column; 332. L-shaped through hole; 333. L-shaped vertical plate; 4. Clamping mechanism; 41. Trapezoidal cushion plate; 42. Guide sliding hole; 43. First clamping part; 431. Clamping seat; 432. First limiting rod; 433. Circular alignment groove; 434. First bearing seat; 435. First lead screw; 436. First bevel gear; 437. Second bearing seat; 438. Rotating shaft; 439. Second bevel gear; 440. Forward and reverse motor; 44. Second clamping part; 441. Support vertical plate; 442. Circular sliding hole; 443. Second limiting rod; 444. Installation cylinder; 445. Third bearing seat; 446. Second lead screw; 447. Handwheel; 5. Vibration mechanism; 51. Rectangular seat; 52. Avoidance opening; 53. Vibration part; 531. First transmission shaft; 532. Second transmission shaft; 533. Cam; 534. Biaxial motor; 6. Counterweight loading and unloading mechanism; 61. Loading and unloading opening; 62. C-shaped guard plate; 63. Pushing part; 631. Baffle plate; 632. L-shaped baffle; 633. Rectangular accommodating opening; 634. First hydraulic push rod; 635. C-shaped pushing plate; 64. Lifting part; 641. Support cross plate; 642. Rectangular top plate; 643. Support sliding rod; 644. Third lead screw; 646. Servo motor; 65. Pushing out part; 651. Second hydraulic push rod; 652. Pushing seat. Detailed implementation manners

[0030] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0031] Refer to Figure 1 , a hydraulic cylinder performance testing device for testing the performance of a hydraulic cylinder. The hydraulic cylinder is composed of a cylinder body and a telescopic end. Mounting seats with preset mounting round holes are installed on both the cylinder body and the telescopic end of the hydraulic cylinder. The performance testing device includes a support frame 1, a support slide plate 2 is slidably installed on the lower side inside the support frame 1, a load-bearing mechanism 3 is arranged on the support frame 1, a clamping mechanism 4 is jointly arranged on the support slide plate 2 and the load-bearing mechanism 3, a vibration mechanism 5 is jointly arranged on the support frame 1 and the support slide plate 2, and a counterweight loading and unloading mechanism 6 is also arranged on the support frame 1.

[0032] Refer to Figure 1-Figure 3, the load-bearing mechanism 3 includes rectangular through holes 31 opened at both the front and rear ends of the support frame 1. A convex load-bearing plate 32 is slidably installed in the two rectangular through holes 31 at the front and rear. Ball bearings are installed at the positions corresponding to the rectangular through holes 31 on the side walls of the left and right ends of the convex load-bearing plate 32. A protection part 33 is provided on the convex load-bearing plate 32. The clamping mechanism 4 includes a trapezoidal cushion plate 41 installed at the upper end of the support sliding plate 2. Two front and rear guiding sliding holes 42 are opened on the upper end of the support sliding plate 2 to the left of the trapezoidal cushion plate 41. A first clamping part 43 is provided on the support sliding plate 2 at the positions corresponding to the two front and rear guiding sliding holes 42. A second clamping part 44 is provided at the lower end of the convex load-bearing plate 32. The counterweight loading and unloading mechanism 6 includes a loading and unloading port 61 opened at the upper end of the support frame 1 corresponding to the convex load-bearing plate 32. A U-shaped protection plate 62 is installed at the upper end of the support frame 1 corresponding to the loading and unloading port 61. A pushing part 63 and a jacking part 64 are respectively provided on the upper end of the support frame 1 to the left of the U-shaped protection plate 62. A pushing-out part 65 is provided on the upper end of the support frame 1 to the right of the U-shaped protection plate 62.

[0033] Refer to Figure 1 , Figure 6 and Figure 7 , the pushing part 63 includes a material blocking plate 631 installed on the upper side of the left end of the U-shaped protection plate 62. L-shaped baffle plates 632 are symmetrically installed at the front and rear of the upper end of the support frame 1. The right ends of the two L-shaped baffle plates 632 at the front and rear are fixedly connected to the material blocking plate 631. Two front and rear rectangular accommodation ports 633 are opened at the positions between the two L-shaped baffle plates 632 at the front and rear on the upper end of the support frame 1.

[0034] First, a plurality of counterweight plates are placed between the two L-shaped baffle plates 632 at the front and rear by an external loading and unloading device. At this time, the plurality of counterweight plates are located at the upper positions of the ball bearings on the convex load-bearing plate 32. Then, the hydraulic cylinder to be tested is conveyed to the middle position of the upper end of the support sliding plate 2 by an external loading and unloading device and supported by the trapezoidal cushion plate 41. At this time, the hydraulic cylinder is in an inclined state. Before the test work, the initial coaxiality of the cylinder body and the telescopic end of the hydraulic cylinder needs to be recorded by the staff.

[0035] Refer to Figure 1 , Figure 5 and Fig. 9The clamping part 43 includes a clamping seat 431 slidably mounted on one side of the front and rear guide sliding holes 42, a limit rod 432 is mounted on the front end of the rear clamping seat 431, and a circular alignment groove 433 is provided at the rear end of the front clamping seat 431 corresponding to the position of the limit rod 432. A plurality of balls evenly distributed in a circumference are mounted on the opposite ends of the front and rear clamping seats 431, and a bearing seat 434 is symmetrically mounted on the lower end of the support slide 2 corresponding to the position of the front and rear guide sliding holes 42, and a lead screw 435 is rotatably mounted on the opposite ends of the front and rear bearing seats 434. , a lead screw 435 passes through the clamping seat 431 and is threadedly connected to the clamping seat 431, a bevel gear 436 is installed at the opposite ends of the front and rear lead screws 435, a bearing seat 437 is installed on the left side of the lower end of the supporting slide plate 2, a rotating shaft 438 is rotatably installed on the bearing seat 437, a bevel gear 439 is installed on the right end of the rotating shaft 438, the front and rear bevel gears 436 are meshed with the bevel gear 439, a forward and reverse motor 440 is installed on the left end of the bearing seat 437 through the motor seat, and the output shaft of the forward and reverse motor 440 is fixedly connected to the rotating shaft 438.

[0036] See also Figure 3 , Figure 4 and Figure 8 The second clamping part 44 includes two front and rear supporting upright plates 441 installed at the lower end of the convex load-bearing plate 32, and circular sliding holes 442 are opened on the upper sides of the front and rear supporting upright plates 441. The diameter of the circular sliding hole 442 on the front side is larger than the diameter of the circular sliding hole 442 on the rear side. A limiting rod 443 is movably arranged in the circular sliding hole 442 on the rear side, and a mounting cylinder 444 with an opening facing forward is movably arranged in the circular sliding hole 442 on the front side. The front end of the limiting rod 443 is fixedly connected to the mounting cylinder 444, and a bearing seat 3 445 is installed on the front side of the lower end of the convex load-bearing plate 32. A lead screw 446 is rotatably installed on the bearing seat 3 445. The rear side of the lead screw 446 is threadedly connected to the mounting cylinder 444, and a hand wheel 447 is installed at the front end of the lead screw 446.

[0037] When the hydraulic cylinder is transported to the middle of the upper end of the support slide plate 2 and supported by the trapezoidal cushion plate 41, first, the staff manually adjusts the position of the hydraulic cylinder so that the mounting seat part of the hydraulic cylinder cylinder body is located between the front and rear clamping seats 431, and the mounting seat part of the telescopic end of the hydraulic cylinder is located between the front and rear support vertical plates 441. It should be noted that the front and rear clamping seats 431 are initially in a state of moving away from each other, the mounting cylinder 444 initially withdraws from the circular sliding hole 442 on the front side, and the front and rear support vertical plates 441 initially slide on the upper end of the support slide plate 2. Then, the positive and reverse motor 440 is controlled to drive the rotating shaft 438 to drive the bevel gear two 439 to rotate forward. Through the transmission of the bevel gear two 439 and the front and rear bevel gears one 436, the front and rear lead screws one 435 are driven to rotate. The front and rear lead screws one 435 respectively drive the corresponding clamping seats 431 to approach each other until the limiting rod one 432 passes through the mounting round hole on the mounting seat of the hydraulic cylinder cylinder body and inserts into the circular alignment groove 433. At this time, the balls on the front and rear clamping seats 431 all roll and contact the mounting seat of the hydraulic cylinder cylinder body. Then, the staff rotates the handwheel 447, the handwheel 447 drives the lead screw two 446 to rotate, and the lead screw two 446 drives the mounting cylinder 444 to move backward until the mounting cylinder 444 inserts into the circular sliding hole 442 on the front side. During this period, the mounting cylinder 444 drives the limiting rod two 443 to pass through the mounting round hole on the mounting seat of the telescopic end of the hydraulic cylinder and inserts into the circular sliding hole 442 on the rear side, thereby realizing the limiting clamping work of the hydraulic cylinder. The clamping mechanism 4 can sequentially perform limiting clamping on the hydraulic cylinder cylinder body and the telescopic end, and the hydraulic cylinder cylinder body can freely rotate around the limiting rod one 432. The clamping is convenient and fast, effectively improving the loading and unloading efficiency of the hydraulic cylinder.

[0038] Refer to Figure 2 and Figure 8 As shown in

[0039] Refer to Figure 1 、 Figure 2 and Figure 6 As shown in

[0040] Refer to Figure 3 and Figure 5-Figure 7, the jacking part 64 includes a support cross plate 641 commonly installed on the upper sides of the inner walls at the front and rear ends of the support frame 1. On the upper left side of the support cross plate 641, two front and rear support sliding rods 643 are installed. On the upper end of the support cross plate 641, on the right side of the two front and rear support sliding rods 643, three lead screws 644 are rotatably installed respectively. The two front and rear lead screws 644 are respectively threadedly connected with rectangular top plates 642. The two front and rear support sliding rods 643 respectively slide through the corresponding rectangular top plates 642, and limit circular plates for limiting the rectangular top plates 642 are installed at the upper ends of the two support sliding rods 643 and the two lead screws 644. A servo motor 646 is installed at the lower end of the support cross plate 641. The output shaft of the servo motor 646 rotates through the support cross plate 641 and is fixedly connected to any one of the lead screws 644. The two front and rear lead screws 644 are connected by a transmission belt.

[0041] It should be noted that after the hydraulic cylinder is limited and clamped, under the action of the compression spring, multiple L-shaped vertical plates 333 initially protrude from the corresponding L-shaped through holes 332. Control the telescopic end of the hydraulic cylinder to gradually extend. At this time, the telescopic end of the hydraulic cylinder will drive the two front and rear support vertical plates 441 through the limiting rod 432 to drive the convex bearing plate 32 to move upward. Under the action of the balls, the two front and rear support vertical plates 441 will drive the convex bearing plate 32 to slide upward along the two front and rear rectangular through holes 31 until the telescopic end of the hydraulic cylinder extends to the maximum distance. At this time, the convex bearing plate 32 is inserted into the loading and unloading port 61, and the upper end surface of the convex bearing plate 32 is flush with the upper end surface of the support frame 1. Multiple L-shaped vertical plates 333 are all retracted into the corresponding L-shaped through holes 332 under the extrusion force of the lower end of the top plate of the support frame 1.

[0042] It should be noted that the two front and rear rectangular top plates 642 are initially located in the corresponding rectangular accommodation ports 633. Then control the first hydraulic push rod 634 to drive the C-shaped push plate 635 to move to the right. The C-shaped push plate 635 will push the corresponding multiple counterweight plates to move to the right until the corresponding multiple counterweight plates all move to the upper end of the convex bearing plate 32. During this period, multiple counterweight plates on the upper side between the two front and rear L-shaped baffles 632 will stay on the upper end of the C-shaped push plate 635 under the action of the baffle plate 631. Then drive the connected lead screw 644 to rotate through the servo motor 646. Under the transmission action of the transmission belt, the two front and rear lead screws 644 rotate synchronously. Under the limiting action of the support sliding rod 643, the two front and rear lead screws 644 respectively drive the corresponding rectangular top plates 642 to move upward until the upper ends of the two front and rear rectangular top plates 642 are attached to the lower end surfaces of multiple counterweight plates between the two front and rear L-shaped baffles 632 and support them, and then control the first hydraulic push rod 634 to drive the C-shaped push plate 635 to move to the left to return to its original position.

[0043] At this time, the multiple counterweight plates on the convex load-bearing plate 32 are in a not fully loaded state. It should be noted that the weight of the convex load-bearing plate 32 during the test can be equal to the lifting arm in the actual application of the hydraulic cylinder. After the hydraulic cylinder is controlled to repeatedly extend and retract multiple times, the staff monitors whether there is hydraulic oil leakage on the surface of the hydraulic cylinder, and re-detects the coaxiality of the hydraulic cylinder body and the telescopic end, and compares it with the coaxiality recorded initially, thereby completing the durability test of the hydraulic cylinder when it is not fully loaded. During this period, the telescopic end of the hydraulic cylinder is controlled to gradually retract, and the telescopic end of the hydraulic cylinder will drive the front and rear two supporting vertical plates 441 to drive the convex load-bearing plate 32 through the limit rod 432 Moving downward, under the action of the balls, the front and rear two supporting vertical plates 441 will drive the convex load-bearing plate 32 to slide downward along the front and rear two rectangular through holes 31 until the telescopic end of the hydraulic cylinder retracts to its original position. It should be noted that under the action of the compression spring, multiple L-shaped vertical plates 333 will extend out from the corresponding L-shaped through holes 332 to limit the multiple counterweight plates on the convex load-bearing plate 32. The load-bearing mechanism 3 and the counterweight loading and unloading mechanism 6 can cooperate to move the multiple counterweight plates to the upper end of the convex load-bearing plate 32, and prevent the problem of position displacement of the counterweight plate during the reciprocating lifting and lowering, thereby completing the durability test of the hydraulic cylinder simulating the under-load state in actual application.

[0044] See also Figure 1 and Figure 2 The vibration mechanism 5 includes a plurality of rectangular seats 51 evenly distributed in a rectangular shape installed on the upper end of the inner wall of the bottom end of the support frame 1. The lower end of the support slide 2 is connected to the inner wall of the bottom end of the support frame 1 through a plurality of support springs. A plurality of avoidance openings 52 distributed in a rectangular shape are opened at the bottom end of the support frame 1. A vibration part 53 is commonly provided on the support slide 2 and the support frame 1.

[0045] See also Figure 2 , Figure 3 and Figure 5 The vibration part 53 includes a transmission shaft 1 531 rotatably installed at the position of the left side avoidance opening 52 on the inner walls of the front and rear ends of the support frame 1, and a transmission shaft 2 532 rotatably installed at the position of the right side avoidance opening 52 on the inner walls of the front and rear ends of the support frame 1. Cams 533 are fixedly sleeved on the positions of the front and rear transmission shafts 1 531 and 2 532 corresponding to the avoidance opening 52, and multiple cams 533 are in rolling contact with the support slide plate 2. The left front side transmission shaft 1 531 and the transmission shaft 2 532 are connected by a transmission belt. A dual-axis motor 534 is installed on the inner wall of the bottom end of the support frame 1 through a motor seat, and the front and rear output shafts of the dual-axis motor 534 are respectively fixedly connected to the corresponding transmission shaft 1 531.

[0046] When conducting the durability test on the hydraulic cylinder in an under-loaded state, the front and rear drive shafts 1-531 are controlled to rotate synchronously by the biaxial motor 534. Under the driving action of the conveyor belt, the front and rear drive shafts 1-531 and the drive shaft 2-532 rotate synchronously. The front and rear drive shafts 1-531 and the drive shaft 2-532 drive a plurality of cams 533 to rotate synchronously. Under the action of a plurality of support springs, the support slide plate 2 reciprocates slightly up and down within the support frame 1, thereby achieving the effect of driving the hydraulic cylinder to vibrate slightly. At the same time, it can simulate the complex working conditions where the crane may vibrate slightly and the heavy object may sway when lifting heavy objects with different loads during actual operation.

[0047] After the durability test on the hydraulic cylinder in the under-loaded state is completed, control the hydraulic cylinder to drive the convex bearing plate 32 to adjust its height until the upper end surfaces of the plurality of counterweight plates on the convex bearing plate 32 are flush with the upper end surface of the support frame 1. Then, drive the front and rear rectangular top plates 642 to move downward by the servo motor 646. When the plurality of counterweight plates on the front and rear rectangular top plates 642 move downward accordingly and the upper end surfaces of a sufficient number of the counterweight plates are flush with the lower end surface of the material baffle 631, control the servo motor 646 to stop working. Then, control the hydraulic push rod 1-634 to drive the U-shaped push plate 635 to move to the right. The U-shaped push plate 635 will push the corresponding plurality of counterweight plates to move to the right until the corresponding plurality of counterweight plates all move to the upper ends of the plurality of counterweight plates on the convex bearing plate 32. During this period, the plurality of counterweight plates on the upper side between the front and rear L-shaped baffles 632 will stay on the upper end of the U-shaped push plate 635 under the action of the material baffle 631 and be supported by the front and rear rectangular top plates 642. Then, control the hydraulic push rod 1-634 to drive the U-shaped push plate 635 to move to the left to return to its original position.

[0048] At this time, the plurality of counterweight plates on the convex bearing plate 32 are in a fully-loaded state. Then, control the hydraulic cylinder to repeat the telescopic movement multiple times again. The staff monitors whether there is any hydraulic oil leakage on the surface of the hydraulic cylinder, and measures the coaxiality of the cylinder body and the telescopic end of the hydraulic cylinder again, and compares it with the initially recorded coaxiality, thereby completing the durability test on the hydraulic cylinder in the fully-loaded state. The load-bearing mechanism 3 and the counterweight loading and unloading mechanism 6 cooperate to continue adding a plurality of counterweight plates to the convex bearing plate 32 to make it in a fully-loaded state, thereby completing the durability test on the hydraulic cylinder in the fully-loaded state in the actual application simulation. Moreover, in the durability tests in the under-loaded state and the fully-loaded state, the vibration mechanism 5 can simulate the complex working conditions where the crane may vibrate slightly and the heavy object may sway when lifting heavy objects with different loads during actual operation, effectively improving the accuracy of the test results.

[0049] Refer to Figure 1 and Figure 6, the pushing-out part 65 includes a plurality of balls evenly installed on the upper end of the support frame 1 on the right side of the U-shaped guard plate 62. A second hydraulic push rod 651 is installed on the upper right end of the support frame 1 through a mounting seat. A pushing seat 652 is installed at the telescopic end of the second hydraulic push rod 651. The plurality of balls on the right side are all in rolling contact with the lower end surface of the pushing seat 652.

[0050] After the durability test of the hydraulic cylinder under full load is completed, repeat the previous step of adding a sufficient number of counterweight plates. Drive the front and rear rectangular top plates 642 to move downward to return to the original position by the servo motor 646. At this time, the plurality of counterweight plates on the convex load-bearing plate 32 are in an overloaded state. Then, control the telescopic end of the hydraulic cylinder to extend to an appropriate distance again, so that the convex load-bearing plate 32 maintains a sufficient height and lasts for 5 minutes. Then, control the telescopic end of the hydraulic cylinder to extend to the maximum distance. At this time, the upper end surface of the convex load-bearing plate 32 is flush with the upper end surface of the support frame 1. Control the second hydraulic push rod 651 to drive the pushing seat 652 to move leftward. The pushing seat 652 will push the plurality of counterweight plates on the convex load-bearing plate 32 to move leftward synchronously, so that they all move to the position between the front and the back to complete the unloading work. Then, control the second hydraulic push rod 651 to drive the pushing seat 652 to move rightward to return to the original position. Then, control the telescopic end of the hydraulic cylinder to retract to the original position. At this time, the front and rear support vertical plates 441 both move downward to the upper end of the support slide plate 2. Finally, the staff monitors whether there is hydraulic oil leakage on the surface of the hydraulic cylinder, and measures the coaxiality of the cylinder body and the telescopic end of the hydraulic cylinder again, and compares it with the coaxiality recorded initially, so as to complete the overpressure test of the hydraulic cylinder under the overloaded state.

[0051] It should be noted that during the loading and unloading of the counterweight plates on the convex load-bearing plate 32, the double-shaft motor 534 needs to be controlled to be turned on or off according to the situation. After multiple tests on the hydraulic cylinder are completed, the staff rotates the handwheel 447 in the reverse direction, and controls the rotating shaft 438 to reverse through the forward and reverse motor 440 to release the limit clamping of the hydraulic cylinder. Then, the hydraulic cylinder to be tested can be taken out by the external loading and unloading equipment. The clamping mechanism 4, the load-bearing mechanism 3, the counterweight loading and unloading mechanism 6 and the vibration mechanism 5 cooperate to limit and clamp the hydraulic cylinder. Then, by gradually increasing a plurality of counterweight plates, the convex load-bearing plate 32 is divided into three states: not full load, full load and overloaded, and two durability tests of not full load and full load and an overpressure test of overloading are carried out respectively. During this period, the hydraulic cylinder can also be driven to vibrate to simulate the complex working conditions in the actual work of the crane, effectively improving the test efficiency and the diversity and accuracy of the test.

[0052] In the description of the embodiments of the present invention, it should be noted that the terms: "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "outer", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention. In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple roots", and "multiple groups" mean two or more.

[0053] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic cylinder performance test device, used for testing the performance of a hydraulic cylinder, wherein the hydraulic cylinder is composed of a cylinder body and a telescopic end, wherein both the cylinder body and the telescopic end of the hydraulic cylinder are equipped with a mounting seat with a preset mounting circular hole, and the performance test device comprises a support frame (1), characterized in that: A support slide plate (2) is slidably installed on the lower side inside the support frame (1). A load-bearing mechanism (3) is arranged on the support frame (1). A clamping mechanism (4) is jointly arranged on the support slide plate (2) and the load-bearing mechanism (3). A vibration mechanism (5) is jointly arranged on the support frame (1) and the support slide plate (2). A counterweight loading and unloading mechanism (6) is also arranged on the support frame (1); The load-bearing mechanism (3) includes rectangular through holes (31) opened at both the front and rear ends of the support frame (1). A convex load-bearing plate (32) is jointly slidably installed in the front and rear two rectangular through holes (31). Ball bearings are installed at the positions corresponding to the rectangular through holes (31) on the side walls of the left and right ends of the convex load-bearing plate (32). A protection part (33) is arranged on the convex load-bearing plate (32); The clamping mechanism (4) includes a trapezoidal cushion plate (41) installed at the upper end of the support slide plate (2). Two front and rear guiding sliding holes (42) are opened on the upper end of the support slide plate (2) on the left side of the trapezoidal cushion plate (41). A first clamping part (43) is arranged on the support slide plate (2) at the positions corresponding to the two front and rear guiding sliding holes (42). A second clamping part (44) is arranged at the lower end of the convex load-bearing plate (32); The counterweight loading and unloading mechanism (6) includes a loading and unloading port (61) opened at the upper end of the support frame (1) corresponding to the convex load-bearing plate (32). A U-shaped guard plate (62) is installed at the upper end of the support frame (1) corresponding to the loading and unloading port (61). A pushing part (63) and a jacking part (64) are respectively arranged on the upper end of the support frame (1) on the left side of the U-shaped guard plate (62). A pushing-out part (65) is arranged on the upper end of the support frame (1) on the right side of the U-shaped guard plate (62).

2. A hydraulic cylinder performance testing device according to claim 1, characterized in that: The vibration mechanism (5) includes a plurality of rectangular seats (51) which are installed at the upper end of the inner wall of the bottom end of the support frame (1) and are evenly distributed in a rectangle. The lower end of the support slide plate (2) is connected to the inner wall of the bottom end of the support frame (1) through a plurality of support springs. A plurality of avoidance openings (52) which are distributed in a rectangle are opened at the bottom end of the support frame (1). A vibration part (53) is jointly arranged on the support slide plate (2) and the support frame (1).

3. A hydraulic cylinder performance testing device according to claim 1, characterized in that: The clamping part 1 (43) includes a clamping seat (431) slidably installed on the closer sides of the front and rear guiding sliding holes (42). A first limiting rod (432) is installed at the front end of the rear clamping seat (431). A circular alignment groove (433) is provided at the position corresponding to the first limiting rod (432) at the rear end of the front clamping seat (431). A plurality of balls evenly distributed in a circumferential manner are installed at the opposite ends of the front and rear clamping seats (431). Bearing seats 1 (434) are symmetrically installed at the positions corresponding to the front and rear guiding sliding holes (42) at the lower end of the support sliding plate (2). A first lead screw (435) is rotatably installed at the opposite ends of the front and rear bearing seats 1 (434). The first lead screw (435) penetrates through the clamping seat (431) and is threadedly connected to the clamping seat (431). A first bevel gear (436) is installed at the opposite ends of the front and rear first lead screws (435). A bearing seat 2 (437) is installed on the left side at the lower end of the support sliding plate (2). A rotating shaft (438) is rotatably installed through the left and right bearing seats 2 (437). A second bevel gear (439) is installed at the right end of the rotating shaft (438). The front and rear first bevel gears (436) are both meshed with the second bevel gear (439). A forward and reverse motor (440) is installed at the left end of the bearing seat 2 (437) through a motor seat. The output shaft of the forward and reverse motor (440) is fixedly connected to the rotating shaft (438).

4. A hydraulic cylinder performance testing device according to claim 1, characterized in that: The clamping part 2 (44) includes the front and rear two support vertical plates (441) installed at the lower end of the convex load-bearing plate (32). Circular sliding holes (442) are provided on the upper sides of the front and rear two support vertical plates (441). The diameter of the circular sliding hole (442) at the front side is larger than the diameter of the circular sliding hole (442) at the rear side. A second limiting rod (443) is movably arranged in the circular sliding hole (442) at the rear side. An installation cylinder (444) with an opening facing forward is movably arranged in the circular sliding hole (442) at the front side. The front end of the second limiting rod (443) is fixedly connected to the installation cylinder (444). A bearing seat 3 (445) is installed at the front side at the lower end of the convex load-bearing plate (32). A second lead screw (446) is rotatably installed through the bearing seat 3 (445). The rear side of the second lead screw (446) is threadedly connected to the installation cylinder (444), and a hand wheel (447) is installed at the front end of the second lead screw (446).

5. A hydraulic cylinder performance testing device according to claim 1, characterized in that: The pushing part (63) includes a material blocking plate (631) installed on the upper side of the left end of the U-shaped guard plate (62). L-shaped baffle plates (632) are symmetrically installed at the front and rear of the upper end of the support frame (1). The right ends of the front and rear two L-shaped baffle plates (632) are fixedly connected to the material blocking plate (631). Two rectangular accommodation openings (633) are provided at the position between the front and rear two L-shaped baffle plates (632) at the upper end of the support frame (1).

6. A hydraulic cylinder performance testing device according to claim 1, characterized in that: The lifting part (64) includes a support cross plate (641) commonly installed on the upper sides of the inner walls at the front and rear ends of the support frame (1). On the upper left side of the support cross plate (641), two front and rear support sliding rods (643) are installed. On the upper end of the support cross plate (641) and on the right sides of the two front and rear support sliding rods (643), three lead screws (644) are rotatably installed. The two front and rear lead screws (644) are respectively threadedly connected to a rectangular top plate (642). The two front and rear support sliding rods (643) respectively slide through the corresponding rectangular top plates (642), and limit circular plates for limiting the rectangular top plates (642) are installed on the upper ends of the two support sliding rods (643) and the two lead screws (644). A servo motor (646) is installed on the lower end of the support cross plate (641). The output shaft of the servo motor (646) rotatably penetrates through the support cross plate (641) and is fixedly connected to any one of the lead screws (644). The two front and rear lead screws (644) are connected by a transmission belt.

7. A hydraulic cylinder performance testing device according to claim 2, characterized in that: The vibration part (53) includes a first transmission shaft (531) rotatably installed at the positions corresponding to the left avoidance openings (52) on the inner walls at the front and rear ends of the support frame (1), and a second transmission shaft (532) rotatably installed at the positions corresponding to the right avoidance openings (52) on the inner walls at the front and rear ends of the support frame (1). Cam rollers (533) are fixedly sleeved at the positions corresponding to the avoidance openings (52) on the two front and rear first transmission shafts (531) and the second transmission shaft (532). A plurality of cam rollers (533) are all in rolling contact with the support sliding plate (2). A transmission belt is connected between the left front first transmission shaft (531) and the second transmission shaft (532). A dual-shaft motor (534) is installed on the bottom inner wall of the support frame (1) through a motor base. The two front and rear output shafts of the dual-shaft motor (534) are respectively fixedly connected to the corresponding first transmission shafts (531).

8. A hydraulic cylinder performance testing device according to claim 1, characterized in that: The protection part (33) includes a plurality of rectangular columns (331) installed through the convex-shaped load-bearing plate (32) and evenly distributed in a rectangle. L-shaped through holes (332) are commonly opened at the upper ends of the plurality of rectangular columns (331). L-shaped vertical plates (333) are slidably connected in the plurality of L-shaped through holes (332) through compression springs.

9. A hydraulic cylinder performance testing device according to claim 5, characterized in that: The pushing-in part (63) further includes a plurality of balls evenly installed at the position between the two front and rear L-shaped baffles (632) on the upper end of the support frame (1). A first hydraulic push rod (634) is installed on the upper left side of the support frame (1) through a mounting seat. A U-shaped pushing plate (635) is installed at the telescopic end of the first hydraulic push rod (634). The plurality of balls are all in rolling contact with the lower end face of the U-shaped pushing plate (635).

10. A hydraulic cylinder performance testing device according to claim 1, characterized in that: The pushing-out part (65) includes a plurality of balls evenly installed on the upper end of the support frame (1) on the right side of the U-shaped protection plate (62). A second hydraulic push rod (651) is installed on the upper right side of the support frame (1) through a mounting seat. A pushing seat (652) is installed at the telescopic end of the second hydraulic push rod (651). The plurality of balls on the right side are all in rolling contact with the lower end face of the pushing seat (652).

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