tensilon tester

Abstract

A kind of fatigue tester belongs to performance detection device technical field.The utility model discloses a kind of fatigue tester for hydraulic cylinder, reduce the hydraulic cylinder fatigue tester of damage to hydraulic cylinder for carrying out durability experiment for hydraulic cylinder.The utility model includes frame, rotating motor, rotating motor coupling connected with rotating motor motor shaft, servo motor, translation motor, coupling, rotating mechanism and upper installation sliding block mechanism are installed on the frame, servo motor articulation connecting rod mechanism is installed on the frame lower surface, hydraulic cylinder bottom fixing mechanism is installed on the lifting platform screw of servo motor articulation connecting rod mechanism.The utility model increases fatigue detection function on the basis of durability experiment, is separated from manual operation, is completed by mechanical body, increases the safety of personnel, through the design of structure, can be accurately carried out million times experiment without damaging hydraulic cylinder.

Description

Technical Field

[0001] This utility model belongs to the technical field of performance testing devices. Background Technology

[0002] Hydraulic cylinders are actuators in mechanical engineering that convert hydraulic energy into linear mechanical energy. They utilize pressurized hydraulic oil to drive a piston or plunger in reciprocating linear motion, thereby generating thrust or pull force. They are widely used in various industrial and mobile equipment. For example, the lifting cylinder in a car's cab uses a hydraulic cylinder structure. However, because hydraulic cylinders involve high-pressure fluids and heavy loads, improper operation or quality issues can easily lead to serious personal injury, equipment damage, or even fatal accidents. Therefore, their safety is extremely critical. After hydraulic cylinders are manufactured, random inspections are conducted to ensure their quality. Durability testing equipment typically simulates repeated pulling and dropping, usually involving 5,000 or 10,000 cycles. The performance of the hydraulic cylinder, including its sealing performance, is then tested to determine its quality. Existing durability testing equipment simply involves repeated pulling and dropping, which is extremely simplistic and can potentially damage the hydraulic cylinder during the process, resulting in highly unstable test data. Summary of the Invention

[0003] The purpose of this invention is to design a hydraulic cylinder failure testing machine for conducting durability tests on hydraulic cylinders, thereby reducing damage to the hydraulic cylinders.

[0004] This utility model includes a frame, a rotary motor, a rotary motor coupling connected to the motor shaft of the rotary motor, a servo motor, a translation motor, and a coupling. A rotary mechanism and an upper sliding block mechanism are installed on the frame, and a servo motor joint linkage mechanism is installed below the frame. A hydraulic cylinder bottom fixing mechanism is installed on the lifting platform lead screw of the servo motor joint linkage mechanism.

[0005] Rotating mechanism: A rotating connecting rod is installed on the rotating motor coupling. The rotating connecting rod is mounted on the rotating connecting rod seat through bearings. The rotating connecting rod seat is mounted on the frame. A rotating roller is installed at the front end of the rotating connecting rod. A small connecting rod mounting hole is opened on the surface of the rotating roller. The small connecting rod is inserted into the small connecting rod mounting hole. The top end of the swing arm is mounted on the small connecting rod in a shaft-like manner.

[0006] Upper mounting slider mechanism: The sliding sleeve at the bottom of the slider is matched and mounted on the slide rail, the slide rail is mounted on the upper mounting bracket, and the upper mounting bracket is fixedly mounted on the frame; the horizontal pin at the bottom of the rocker arm is mounted on the upper end of the slider in the form of a shaft, and the upper mounting rod of the hydraulic cylinder is mounted on the lower end of the slider in the form of a shaft;

[0007] Servo motor joint linkage mechanism: The motor shaft of the servo motor is connected to the main coupling, the main coupling is connected to the auxiliary coupling through a primary coupling, the auxiliary coupling is connected to the coupling adapter through a secondary coupling, and the output shaft of the coupling adapter is connected to the lifting platform lead screw;

[0008] Hydraulic cylinder bottom fixing mechanism: A lifting platform is threadedly fitted onto the lifting platform screw. A translation bearing seat is fixedly installed on the lifting platform. A translation screw is installed on the two translation bearing seats through bearings. One end of the translation screw is connected to the motor shaft of the translation motor. The cylinder body of the translation motor is fixedly installed on the lifting platform. The bottom of the hydraulic cylinder lower mounting rod base is threadedly fitted onto the translation screw. A hydraulic cylinder lower mounting rod is installed on the hydraulic cylinder lower mounting rod base.

[0009] In this invention, a servo motor joint linkage mechanism is mounted on a counterweight mechanism bracket. The top of the lifting platform screw is connected to the counterweight mechanism bracket via a bearing. A counterweight mounting pulley is installed on the counterweight mechanism bracket, and the counterweight is hung on the counterweight mounting pulley via a cable.

[0010] This utility model has an angle gauge installed on the side of the base of the hydraulic cylinder lower mounting rod, and a coaxial angle lever is installed on the outer end of the hydraulic cylinder lower mounting rod corresponding to the angle gauge.

[0011] This invention adds a motion detection function to the durability test, eliminating the need for manual operation and completing the task through the mechanical body, thus increasing personnel safety. Through structural design, it can accurately conduct tens of thousands of tests without damaging the hydraulic cylinder. Attached Figure Description

[0012] Figure 1 This is a side view of the overall structure of this utility model;

[0013] Figure 2 This is a front view of the overall structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the rotating mechanism and the upper mounting slider mechanism of this utility model;

[0015] Figure 4 This is a utility model Figure 3 The right view;

[0016] Figure 5 This is a utility model Figure 3 The left view;

[0017] Figure 6 This utility model relates to a hydraulic cylinder bottom fixing mechanism. Figure 1 Enlarged view of part A;

[0018] Figure 7 This is a utility model Figure 6 The left view;

[0019] Figure 8 This is a top view of the servo motor joint linkage mechanism of this utility model. Detailed Implementation

[0020] This utility model includes a frame 4, a rotary motor 101, a rotary motor coupling 102 connected to the motor shaft of the rotary motor 101, a servo motor 801, a translation motor 201, and couplings. This utility model utilizes a total of three motors (rotary motor 101, translation motor 201, and servo motor 801), all of which perform rotational functions. The frame 4 is a frame structure, and all components involved in this utility model are mounted on this frame. The rotary motor coupling 102 and the couplings are existing couplings. The rotary motor coupling 102 is a linear coupling. The other couplings (mainly the main coupling 803 and the auxiliary coupling 805 in the servo motor joint linkage mechanism 8, and the coupling adapter 804) decompose the linear power of the servo motor 801 into each part, that is, they simultaneously distribute the rotational motion and torque of one input shaft to two output shafts.

[0021] A rotating mechanism 1 and an upper sliding block mechanism 5 are mounted on the frame 4. A servo motor joint linkage mechanism 8 is mounted below the frame 4. A hydraulic cylinder bottom fixing mechanism 2 is mounted on the lifting platform lead screw 7 of the servo motor joint linkage mechanism 8. Figure 1 and Figure 2 The rotating mechanism 1 of this utility model is located at the top of the frame 4, the upper mounting slider mechanism 5 is installed on the upper side of the frame, the servo motor joint linkage mechanism 8 is located at the bottom of the frame 4, and the hydraulic cylinder bottom fixing mechanism 2 is installed on the screw 7 of the lifting platform driven by the servo motor joint linkage mechanism 8.

[0022] Rotating Mechanism 1: A rotating connecting rod 103 is mounted on the rotating motor coupling 102. The rotating connecting rod 103 is mounted on a rotating connecting rod seat 104 via bearings. The rotating connecting rod seat 104 is mounted on the frame 4. A rotating roller 105 is mounted at the front end of the rotating connecting rod 103. A small connecting rod mounting hole 108 is opened on the surface of the rotating roller 105. A small connecting rod 106 is inserted into the small connecting rod mounting hole 108. The top end of the swing rod 107 is mounted on the small connecting rod 106 in a shaft-like manner. See Figure 3 The rotary motor 101 drives the rotating connecting rod 103 and the rotating roller 105 to rotate via a coupling. The rotating connecting rod seat 104, similar to a bracket, supports the rotating connecting rod 103. The rotating connecting rod seat 104 and the rotating connecting rod 103 are connected by bearings. See [link / reference needed] Figure 4Many holes (small connecting rod mounting holes 108) that are not concentric with the rotating connecting rod 103 are opened on the surface of the rotating roller 105. In this way, when the rotating connecting rod 103 rotates, the small connecting rod mounting holes 108 will rotate eccentrically around the axis of the rotating connecting rod 103. There are multiple small connecting rod mounting holes 108, and the distance between the center of each hole and the axis of the rotating connecting rod 103 is different.

[0023] See Figure 3 side, Figure 4 positive and Figure 5 Subsequently, the small connecting rod 106 is inserted into the small connecting rod mounting hole 108 and is relatively fixed (that is, it will not move during operation, but when the eccentric distance needs to be changed, it needs to be removed and then inserted into the small connecting rod mounting hole 108 with another required eccentric distance). Then, the upper end of the swing arm 107 is fitted onto the small connecting rod 106 in the form of a bushing. In this way, when the seat of the small connecting rod 106 rotates eccentrically, the upper end of the swing arm 107 swings slightly and moves up and down (from... Figure 4 (The installation position is already at the maximum swing amplitude). At this time, the swing arm 107 performs three movements: first, a small swing; second, a vertical movement; and third, the small connecting rod 106 rotates relative to the swing arm 107.

[0024] Upper mounting slider mechanism 5: The sliding sleeve 505 at the bottom of slider 501 is matched and mounted on the slide rail 503. The slide rail 503 is mounted on the upper mounting bracket 504, and the upper mounting bracket 504 is fixedly mounted on the frame 4. The transverse pin 109 at the bottom of the rocker arm 107 is mounted on the upper end of slider 501 in a shaft-like manner. The upper mounting rod 502 of the hydraulic cylinder is mounted on the lower end of slider 501 in a shaft-like manner. The upper mounting bracket 504 is the mounting bracket for this mechanism and the frame 4. The slide rail 503 and the sliding sleeve 505 are matched, that is, the sliding sleeve 505 makes up-and-down linear movement on the slide rail 503. See Figure 5 The lower end of the swing arm 107 has a horizontal pin 109 perpendicular to the swing arm's upright position. Both ends of the horizontal pin 109 are inserted into the slider 501. Furthermore, the diameter of the horizontal pin 109 has a gap with the mounting hole of the slider 501, allowing the horizontal pin 109 to also wobble within the mounting hole of the slider 501 when the upper end of the swing arm 107 undergoes eccentric motion. The eccentricity or wobble amplitude here is not significant. As can be seen from the preceding description, when the rotating roller 105 rotates, it causes the swing arm 107 to undergo eccentric motion, simultaneously dragging the slider 501 and the sliding sleeve 505 along the slide rail 503 in a reciprocating up-and-down motion. The mounting rod 502 on the hydraulic cylinder is simply a rod; during experiments, the U-shaped clamp at the upper end of the hydraulic cylinder piston rod is typically fitted onto this rod.

[0025] Servo motor joint linkage mechanism 8: The motor shaft of the servo motor 801 is connected to the main coupling 803. The main coupling 803 is connected to the auxiliary coupling 805 via a primary coupling 802. The auxiliary coupling 805 is connected to the coupling adapter 804 via a secondary coupling 806. The output shaft of the coupling adapter 804 is connected to the lifting platform lead screw 7. From Figure 8 As can be seen, the servo motor 801 is a power source, equipped with three one-to-two couplings (main coupling 803 and auxiliary coupling 805) and four output couplings (coupling adapters 804). The primary coupling 802 and the secondary coupling 806 form a disassembled coupling, sequentially transmitting the power of the servo motor 801 to the coupling adapters 804. See... Figure 8 The servo motor 801 operates and connects to the first split-type coupling (main coupling 803) via a coupling. This coupling distributes power to the two primary couplings 802 at both ends. Each of the two primary couplings 802 is then connected to a second split-type coupling (secondary coupling 805), which further distributes power to the coupling adapters 804 at both ends. Therefore, as shown in the diagram, the coupling adapters 804 are located at the four corners, meaning that a total of four coupling adapters 804 are installed. The output shafts of all four coupling adapters 804 point upwards and are connected to their respective lifting platform lead screws 7, ultimately enabling the four lifting platform lead screws 7 to rotate synchronously.

[0026] Hydraulic cylinder bottom fixing mechanism 2: A lifting platform 203 is threadedly fitted onto the lifting platform lead screw 7. A translation bearing seat 202 is fixedly installed on the lifting platform 203. A translation lead screw 204 is mounted on the two translation bearing seats 202 via bearings. One end of the translation lead screw 204 is connected to the motor shaft of the translation motor 201. The cylinder body of the translation motor 201 is fixedly installed on the lifting platform 203. The bottom of the hydraulic cylinder lower mounting rod base 208 is threadedly fitted onto the translation lead screw 204. A hydraulic cylinder lower mounting rod 209 is installed on the hydraulic cylinder lower mounting rod base 208. See Figure 6 and Figure 7 The hydraulic cylinder bottom fixing mechanism 2 is installed on the lifting platform screw 7 via four corner threads of the lifting platform 203. The hydraulic cylinder bottom fixing mechanism 2 comprises two parts: a hydraulic cylinder connecting mechanism and a translation mechanism for the hydraulic cylinder connecting mechanism. The hydraulic cylinder connecting mechanism consists of a hydraulic cylinder lower mounting rod base 208 and a hydraulic cylinder lower mounting rod 209. Generally, the U-clamp at the bottom (cylinder body) of the hydraulic cylinder is fitted onto the hydraulic cylinder lower mounting rod 209. The translation mechanism of the hydraulic cylinder connecting mechanism is a mechanism for the hydraulic cylinder connecting mechanism I to perform lateral translation on the lifting platform 203, see... Figure 6After the translation motor 201 starts working, it drives the translation screw 204 to rotate. At this time, the hydraulic cylinder lower mounting rod base 208, which is threadedly matched with the translation screw 204, moves left and right (the left and right directions are...). Figure 6 (Once the direction is determined), the hydraulic cylinder can be adjusted to the optimal tilt angle position.

[0027] In this invention, the servo motor joint linkage mechanism 8 is mounted on the counterweight mechanism bracket 3. The top of the lifting platform lead screw 7 is connected to the counterweight mechanism bracket 3 via bearings. A counterweight mounting pulley 6 is installed on the counterweight mechanism bracket 3, and the counterweight is suspended from the mounting pulley 6 via a cable. Since the number of tests conducted during the installation of the hydraulic cylinder is typically over ten thousand, the entire machine may shake. Therefore, a counterweight is added to increase the overall weight of the machine and thus enhance its stability during operation.

[0028] In this invention, an angle gauge 207 is installed on the side of the hydraulic cylinder lower mounting rod base 208, and a coaxial angle lever 206 is installed on the outer end of the hydraulic cylinder lower mounting rod 209 corresponding to the angle gauge 207. During the durability test, the hydraulic cylinder to be tested is installed at an angle. This angle is designed to simulate the angle of the hydraulic cylinder installed between the cab and the vehicle body. Therefore, to match the test angle, a coaxial angle lever 206 and an angle ruler 207 are provided. The angle ruler 207 is similar to a protractor with angle markings, while the coaxial angle lever 206 is similar to an angle ruler, used to indicate the angle markings on the angle ruler 207. After the U-clamp at the bottom of the hydraulic cylinder body is installed on the lower mounting rod 209 of the hydraulic cylinder, the translation motor 201 operates. At this time, the base 208 of the lower mounting rod of the hydraulic cylinder moves along the translation screw 204. When the coaxial angle lever 206 reaches the required angle relative to the angle ruler 207, the translation motor 201 stops operating, making the tilt angle of the hydraulic cylinder basically the same as the required angle.

[0029] The present invention uses a translation motor 201 and a translation screw 204 to adjust the lateral position of the hydraulic cylinder, and a servo motor 801 and a lifting platform screw 7 to adjust the longitudinal position of the hydraulic cylinder, thus completing the adjustment of the hydraulic cylinder in two directions.

[0030] Work process:

[0031] First, the U-clamp at the piston rod end of the hydraulic cylinder is fitted onto the upper mounting rod 502 of the hydraulic cylinder, so that the hydraulic cylinder is hung on the upper mounting rod 502. At this time, the servo motor 801 is started, and the lifting platform screw 7 rises until the position of the lower mounting rod 209 of the hydraulic cylinder aligns with the U-clamp at the bottom of the suspended hydraulic cylinder body. Then, the U-clamp at the bottom of the hydraulic cylinder body is installed on the lower mounting rod 209 of the hydraulic cylinder. At this time, the tilt angle of the hydraulic cylinder is adjusted by slowly working the lifting platform screw 7 and the translation screw 204 respectively, until the desired angle is reached by observing the scale of the coaxial angle lever 206 relative to the angle ruler 207. After that, the servo motor 801 and the translation motor 201 are stopped simultaneously. In this way, the installation position of the hydraulic cylinder is fixed (during this installation process, the hydraulic cylinder is in a fully compressed state, that is, the piston rod is completely placed in the cylinder body). After the installation is completed, the rotary motor 101 starts to work, and the swing arm 107, carrying the slider 501, drags the hydraulic cylinder piston rod in a reciprocating motion to conduct a durability test.

Claims

1. A motion testing machine, comprising a frame (4), a rotary motor (101), a rotary motor coupling (102) connected to the motor shaft of the rotary motor (101), a servo motor (801), a translation motor (201), and the coupling, characterized in that: A rotating mechanism (1) and an upper sliding block mechanism (5) are installed on the frame (4). A servo motor joint linkage mechanism (8) is installed below the frame (4). A hydraulic cylinder bottom fixing mechanism (2) is installed on the lifting platform screw (7) of the servo motor joint linkage mechanism (8). Rotating mechanism (1): A rotating connecting rod (103) is installed on a rotating motor coupling (102). The rotating connecting rod (103) is mounted on a rotating connecting rod seat (104) via a bearing. The rotating connecting rod seat (104) is mounted on a frame (4). A rotating roller (105) is installed at the front end of the rotating connecting rod (103). A small connecting rod mounting hole (108) is opened on the surface of the rotating roller (105). The small connecting rod (106) is inserted into the small connecting rod mounting hole (108). The top end of the swing rod (107) is mounted on the small connecting rod (106) in a shaft form. Upper mounting slider mechanism (5): The sliding sleeve (505) at the bottom of the slider (501) is matched and mounted on the slide rail (503), the slide rail (503) is mounted on the upper mounting bracket (504), and the upper mounting bracket (504) is fixedly mounted on the frame (4); the transverse pin (109) at the bottom of the swing rod (107) is mounted on the upper end of the slider (501) in the form of a shaft, and the upper mounting rod (502) of the hydraulic cylinder is mounted on the lower end of the slider (501) in the form of a shaft. Servo motor joint linkage mechanism (8): The motor shaft of the servo motor (801) is connected to the main coupling (803), the main coupling (803) is connected to the auxiliary coupling (805) through the first-stage coupling (802), the auxiliary coupling (805) is connected to the coupling adapter (804) through the second-stage coupling (806), and the output shaft of the coupling adapter (804) is connected to the lifting platform lead screw (7); Hydraulic cylinder bottom fixing mechanism (2): A lifting platform (203) is fitted on the lifting platform screw (7) by thread matching. A translation bearing seat (202) is fixedly installed on the lifting platform (203). A translation screw (204) is installed on the two translation bearing seats (202) by bearings. One end of the translation screw (204) is connected to the motor shaft of the translation motor (201). The cylinder body of the translation motor (201) is fixedly installed on the lifting platform (203). The bottom of the hydraulic cylinder lower mounting rod base (208) is threadedly installed on the translation screw (204). A hydraulic cylinder lower mounting rod (209) is installed on the hydraulic cylinder lower mounting rod base (208).

2. The motion testing machine according to claim 1, characterized in that: The servo motor joint linkage mechanism (8) is installed on the counterweight mechanism bracket (3). The top of the lifting platform screw (7) is connected to the counterweight mechanism bracket (3) through a bearing. A counterweight installation pulley (6) is installed on the counterweight mechanism bracket (3). The counterweight is hung on the counterweight installation pulley (6) by a sliding cable.

3. The motion testing machine according to claim 1, characterized in that: An angle gauge (207) is installed on the side of the hydraulic cylinder lower mounting rod base (208), and a coaxial angle lever (206) is installed on the outer end of the hydraulic cylinder lower mounting rod (209) on the side corresponding to the angle gauge (207).

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