A pressure testing machine

Abstract

The present invention discloses a pressure detection machine, including a frame and two detection mechanisms, wherein the frame is provided with a mounting seat, the mounting seat is provided with a mounting groove, the mounting groove is used to install a motor to be detected, and the mounting seat is also provided with a propping mechanism, the propping mechanism is used to prop open two brushes of the motor to be detected; the detection mechanism includes a detection rod, a connecting frame and a tension sensor, the two detection mechanisms are symmetrically arranged, the two detection rods are located between the two brushes and respectively abut the two brushes, and the force of the brushes on the detection rods is transmitted to the tension sensor via the connecting frame. By setting the propping mechanism and the detection mechanism, the user can quickly install the motor and directly measure the contact pressure, which effectively improves the detection efficiency of the detection machine, and the tension sensor directly detects the pressure of the brush on the detection rod through the tension of the connecting frame, which avoids the error that may occur in manual detection, and can effectively improve the detection accuracy of the detection machine.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a pressure detection machine. Background Art

[0002] Motors are a common power source in modern industrial equipment. In some precision equipment, such as medical devices, high requirements are placed on their performance. As an important parameter that affects the service life and functional loss of the motor, the contact pressure of the brush on the rotor needs to be maintained within a reasonable range. If the contact pressure is too small, it will cause contact bounce and unstable contact voltage drop, which can easily cause sparking and reduce the service life of the motor. If the pressure is too large, it will increase the wear of the brushes and rotor and affect the normal use of the motor. Therefore, it is necessary to test the contact pressure of the pre-installed motor. However, there is no special equipment on the market for testing this contact pressure. It mainly relies on manual detection. During manual detection, even slight shaking of the user's hand may affect the test results. This measurement method has low measurement efficiency and large measurement errors. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention provides a pressure testing machine, which can effectively improve the testing efficiency and testing accuracy of the testing machine.

[0004] A pressure detection machine according to an embodiment of the present invention comprises: a frame and two detection mechanisms, the frame is provided with a mounting seat, the mounting seat is provided with a mounting groove, the mounting groove is used to install a motor to be detected, the mounting seat is also provided with a spreading mechanism, the spreading mechanism is used to spread two brushes of the motor to be tested; the detection mechanism comprises a detection rod, a connecting frame and a tension sensor, the tension sensor is installed on the frame, the connecting frame is slidably installed on the frame, the two ends of the connecting frame are respectively connected to the detection end of the tension sensor and the detection rod, the two detection mechanisms are symmetrically arranged, the two detection rods are located between the two brushes and respectively abut against the two brushes, and the force of the brush on the detection rod is transmitted to the tension sensor via the connecting frame.

[0005] A pressure detection machine according to an embodiment of the present invention has at least the following beneficial effects: when detecting the contact pressure between the brush and the rotor in the motor, it is only necessary to install the motor without the rotor installed or the motor with the rotor removed into the installation slot, and the expansion mechanism expands the two brushes of the motor to be tested so that the two detection rods extend between the two brushes of the motor, and each detection rod abuts against one brush. At this time, the detection rod can be regarded as a rotor in a stationary state. The brush presses the detection rod under the elastic force of the spring sheet, generates a pulling force on the detection rod, thereby pulling the connecting frame. The pulling force of the brush acting on the detection rod detected by the tension sensor connected to the connecting frame is the contact pressure between the brush and the rotor in the motor. By setting the expansion mechanism and the detection mechanism, the user can quickly install the motor and directly measure the contact pressure. The operation is simple and easy to use, which effectively improves the detection efficiency of the detection machine. In addition, the tension sensor directly detects the pressure of the brush on the detection rod through the tension of the connecting frame, which avoids the errors that may occur in manual detection and effectively improves the detection accuracy of the detection machine.

[0006] According to some embodiments of the present invention, the spreading mechanism includes a finger cylinder and two levers, the finger cylinder is installed on the frame, two output ends of the finger cylinder are respectively equipped with two connecting plates, the connecting plates are correspondingly connected to the levers, the two levers are symmetrically arranged and both are inserted into the mounting grooves, and the finger cylinder is used to drive the two levers to move toward or away from each other.

[0007] According to some embodiments of the present invention, the frame is provided with two adjustment mechanisms, the adjustment mechanisms and the detection mechanisms are arranged correspondingly, the adjustment mechanism includes a driving member, a connecting block and a slide, the tension sensor is installed on the slide, the connecting frame is slidably installed on the slide, the slide is slidably installed on the frame, the sliding direction of the slide is the same as the sliding direction of the connecting frame, the driving member is installed on the frame, the output end of the driving member is connected to the slide through the connecting block, and the two driving members are used to drive the two detection rods to move toward or away from each other.

[0008] According to some embodiments of the present invention, the driving member is configured as a micrometer, the micrometer is installed on the frame, the core shaft of the micrometer is connected to a connector, the connector is provided with a bearing, one end of the connecting block is bolted to the slide, and the other end is provided with a fixed shaft, the fixed shaft is provided with a limiting portion at one end facing the micrometer, and the bearing is sleeved on the fixed shaft and located between the connecting block and the limiting portion.

[0009] According to some embodiments of the present invention, the frame is provided with a zero position block, and both of the two slides are provided with a positioning block, and the slides are moved so that the positioning block abuts against the zero position block, thereby moving the detection rod to the center of the installation slot.

[0010] According to some embodiments of the present invention, the frame is provided with a first slide rail, the slide platform is provided with a first slider that slides with the first slide rail, and the frame is connected to a first limit block, the first limit block is located at one end of the first slide rail away from the zero position block, and the first limit block protrudes upward from the first slide rail.

[0011] According to some embodiments of the present invention, the slide table is provided with a second slide rail, the connecting frame is provided with a second slider slidably matched with the second slide rail, the tension sensor is connected to a bracket, the end of the bracket facing away from the tension sensor is provided with a second limit block, the second limit block is connected to the slide table, and the second limit block is used to limit the sliding of the second slider.

[0012] According to some embodiments of the present invention, the mounting seat is provided with a vertically arranged guide rod, the guide rod is slidably connected with a pressure block along the vertical direction, and the pressing end of the pressure block is located above the mounting groove.

[0013] According to some embodiments of the present invention, the frame is installed with a lifting cylinder, the output end of the lifting cylinder is connected to the mounting seat, and the lifting cylinder is used to drive the mounting seat to move in a vertical direction.

[0014] According to some embodiments of the present invention, the frame is provided with a speed regulating valve, and the speed regulating valve is respectively connected to the finger cylinder and the lifting cylinder through a plurality of air pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a pressure testing machine according to an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0017] Figure 3 is a schematic structural diagram of a connecting piece according to an embodiment of the present invention;

[0018] Figure 4 is a schematic structural diagram of a pressure testing machine according to another angle of an embodiment of the present invention;

[0019] Figure 5 yes Figure 4 The enlarged view of point B in the middle;

[0020] Figure 6 4 is a left side view of a pressure testing machine according to an embodiment of the present invention.

[0021] Reference numerals: frame 100; zero block 110; first slide rail 120; first limit block 130; lifting cylinder 140; speed regulating valve 150; pressure regulating filter valve 160; mounting seat 200; mounting groove 201; opening mechanism 210; finger cylinder 211; lever 212; connecting piece 213; pressing block 220; guide rod 230; support plate 240; side plate 250; detection mechanism 300; detection rod 310; connecting frame 320; second Slider 321; tension sensor 330; adjustment mechanism 400; drive member 410; micrometer 411; spindle 4111; display screen 4112; connecting block 420; slide table 430; positioning block 431; first slider 432; second slide rail 433; bracket 434; second limit block 4341; connector 440; bearing 441; fixed axis 450; limit part 451; control system 500; switch 510; display 520. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0025] Reference Figures 1 to 6According to an embodiment of the present invention, a pressure testing machine includes a frame 100 and two testing mechanisms 300. The frame 100 is provided with a mounting seat 200. The mounting seat 200 is composed of a propping mechanism 210 and a mounting frame. The mounting frame includes a support plate 240 and a side plate 250. The support plate 240 is located above the propping mechanism 210. The side plates 250 are symmetrically arranged on both sides of the propping mechanism 210. The top of the side plate 250 is connected to the support plate 240, and the bottom is connected to the frame 100. The support plate 240 is provided with a mounting groove 201. The mounting groove 201 is used to install the motor to be tested. The mounting seat 200 is also provided with a propping mechanism 210. The propping mechanism 210 is provided with a mounting groove 201. 10 is used to prop open the two brushes of the motor to be tested; the detection mechanism 300 includes a detection rod 310, a connecting frame 320 and a tension sensor 330, the tension sensor 330 is installed on the frame 100, the connecting frame 320 is slidably installed on the frame 100 along the horizontal direction (i.e., the deformation direction of the tension sensor 330), the two ends of the connecting frame 320 are respectively connected to the detection end of the tension sensor 330 and the detection rod 310, the two detection mechanisms 300 are symmetrically arranged, the two detection rods 310 are located between the two brushes and respectively abut the two brushes, and the force of the brushes on the detection rod 310 is transmitted to the tension sensor 330 via the connecting frame 320.

[0026] It can be understood that when detecting the contact pressure between the brush and the rotor in the motor, it is only necessary to install the motor that has not yet installed the rotor or the motor with the rotor removed into the installation slot 201, and the opening mechanism 210 opens the two brushes of the motor to be tested, so that the two detection rods 310 extend between the two brushes of the motor, and each detection rod 310 abuts against one brush. At this time, the detection rod 310 can be regarded as the rotor in a stationary state. The brush presses the detection rod 310 under the elastic force of the spring sheet, and generates a pulling force on the detection rod 310, thereby pulling the connecting frame 320, and the pulling force connected to the connecting frame 320 The pulling force of the brush on the detection rod 310 detected by the sensor 330 is the contact pressure between the brush and the rotor in the motor. By setting the spreading mechanism 210 and the detection mechanism 300, the user can quickly and directly measure the contact pressure after installing the motor. The operation is simple and easy to use, which can effectively improve the detection efficiency of the detection machine. The tension sensor 330 directly detects the pressure of the brush on the detection rod 310 through the tension of the connecting frame 320, which avoids the possible errors of the sensor caused by the worker's hand shaking and shaking during manual detection, and can effectively improve the detection accuracy of the detection machine.

[0027] Furthermore, the mounting seat 200 is provided with a pressing block 220 and a guide rod 230, the guide rod 230 is installed with the support plate 240 along the vertical direction, the pressing block 220 is sleeved on the guide rod 230, and the pressing block 220 is slidably installed on the guide rod 230 along the vertical direction, and the pressing end of the pressing block 220 is located above the mounting groove 201. By setting the pressing block 220, since the pressing block 220 itself is sleeved on the guide rod 230, when the user installs the motor, the pressing block 220 can be rotated to make the pressing end of the pressing block 220 leave the top of the installation slot 201. After the user has installed the motor, the pressing end of the pressing block 220 is turned back to the top of the installation slot 201 and presses the motor. By setting the pressing block 220, the pressing block 220, the support plate 240 and the side wall of the installation slot 201 cooperate with each other, and the motor can be limited from six directions, effectively improving the installation stability of the motor. In addition, the pressing block 220 itself can be slidably adjusted in the vertical direction, so that the mounting base 200 can adapt to motors of different heights, thereby expanding the application range of the detection machine.

[0028] Reference Figure 1 and Figure 2 It can be understood that the frame 100 is provided with two adjustment mechanisms 400, and the adjustment mechanisms 400 and the detection mechanisms 300 are arranged correspondingly. The adjustment mechanism 400 includes a driving member 410, a connecting block 420 and a slide 430. The tension sensor 330 is installed on the slide 430, the connecting frame 320 is slidably installed on the slide 430, and the slide 430 is slidably installed on the frame 100. The sliding direction of the slide 430 is the same as the sliding direction of the connecting frame 320. The driving member 410 is installed on the frame 100, and the output end of the driving member 410 is connected to the slide 430 through the connecting block 420. The two driving members 410 are used to drive the two detection rods 310 to move toward or away from each other. By setting the adjustment mechanism 400, the user can use the driving member 410 to move the detection rod 310. According to the different distances between the two detection rods 310, the two detection rods 310 can cooperate to simulate rotors of different diameters, thereby providing more data for user research, further expanding the application scope of the detection machine, effectively improving the richness of the detection results of the detection machine, and improving the product competitiveness of the detection machine.

[0029] It should be noted that when the user uses the driving member 410 to move the slide 430, the connecting frame 320 on the slide 430 will slide synchronously, thereby resisting the friction force generated by the sliding of the slide 430 on the detection rod 310, thereby preventing the tension generated by the movement of the slide 430 from affecting the measurement structure of the tension sensor 330, thereby improving the accuracy of the detection results of the detection machine.

[0030] Furthermore, the frame 100 is provided with a zero block 110, and the zero block 110 corresponds to the center position of the installation slot 201. The slide 430 is provided with a positioning block 431. The moving slide 430 makes the positioning block 431 abut against the zero block 110, thereby moving the detection rod 310 to the center of the installation slot 201. When the user slides the slide 430 to make the positioning block 431 abut against the zero block 110, the reading of the micrometer 411 can be returned to zero. At this time, the two detection rods 310 will move to the center of the installation slot 201, and the distance between the two detection rods 310 is minimized. By setting the zero block 110 and the positioning block 431, the detection rod 310 can be zeroed and adjusted, which is convenient for the user to use the detection machine next time. At the same time, the zero block 110 and the positioning block 431 cooperate to limit the slide 430 to prevent one of the slides 430 from moving too much inward and causing the two detection rods 310 to abut against each other, thereby avoiding the pressure between the two detection rods 310, affecting the detection results of the tension sensor 330, and further improving the accuracy of the detection results of the detection machine.

[0031] Further, the frame 100 is provided with a first slide rail 120, the slide 430 is provided with a first slider 432 that is slidably matched with the first slide rail 120, and the frame 100 is connected with a first limit block 130, the first limit block 130 abuts against one end of the first slide rail 120 away from the zero block 110, and the first limit block 130 protrudes upward and is arranged on the first slide rail 120 to limit the sliding of the first slider 432. Since the first limit block 130 is located at one end of the first slide rail 120 away from the zero block 110, when the user slides the slide 430 outward, the first limit block 130 will prevent the movement of the first slider 432, and the first limit block 130 cooperates with the positioning block 431 to limit the slide 430 in the horizontal direction, so as to avoid the spring sheet of the motor being damaged by the excessive spacing between the two detection rods 310, or the compression caused by the mutual pressure of the two detection rods 310, thereby enhancing the protection of the detection machine to the motor to be tested and extending the service life of the detection rod 310.

[0032] Furthermore, the slide 430 is provided with a second slide rail 433, the connecting frame 320 is provided with a second slider 321 that is slidably matched with the second slide rail 433, the tension sensor 330 is connected with a bracket 434, and the end of the bracket 434 that is away from the tension sensor 330 is provided with a second limit block 4341, the second limit block 4341 is connected to the slide 430, and the second limit block 4341 is used to limit the sliding of the second slider 321. By providing the second limit block 4341, the second limit block 4341 cooperates with the positioning block 431, and the connecting frame 320 can be limited in the horizontal direction, so as to avoid the excessive movement of the connecting frame 320 toward the bracket 434 to squeeze the tension sensor 330, thereby damaging the tension sensor 330, and effectively extending the service life of the tension sensor 330.

[0033] Reference Figure 2 and Figure 3 It can be understood that the driving member 410 is configured as a micrometer 411, the micrometer 411 is installed on the frame 100, the core shaft of the micrometer 411 is connected to the connector 440, the connector 440 is provided with a bearing 441, one end of the connecting block 420 is bolted to the slide 430, and the other end is installed with a fixed shaft 450, and the end of the fixed shaft 450 facing the micrometer 411 is provided with a limiting portion 451, and the bearing 441 is sleeved on the fixed shaft 450 and located between the connecting block 420 and the limiting portion 451. Micrometer 411 is also called a screw micrometer. Its main principle is to process a thread with a pitch of 0.5mm on a core shaft 4111, and the core shaft is inserted into the screw sleeve of the casing. The core shaft 4111 is rotated, and the core shaft 4111 spirally slides. The number of turns of the spiral rotation of the core shaft 4111 can be converted into the moving distance of the core shaft 4111, and then the precise displacement change can be measured. The drive member 410 is set to a micrometer 411, and the spacing between the two detection rods 310 can be accurately controlled, and then the motors of different diameters can be accurately simulated according to actual needs, effectively improving the accuracy of the detection structure of the detection machine. Since the core shaft 4111 of the micrometer 411 makes the spiral slide, it is necessary to install a connector 440 to convert the spiral rotation of the core shaft 4111 into the sliding of the slide 430. The user rotates the core shaft 4111 to move the core shaft outward. When the user rotates the core shaft 4111 to move the core shaft 4111 inward (that is, when the two core shafts 4111 drive the two sliding plates to move towards each other), the rotation of the core shaft 4111 drives the bearing 441 to rotate, and the bearing 441 moves inward on the fixed shaft 450 and abuts against the limit portion 451, and the slider is driven to slide inward by the pressure between the connector 440 and the connecting block 420. By setting the connector 440, the sliding stability of the slide can be effectively improved, thereby improving the operating stability of the detection machine.

[0034] It should be noted that the micrometer 411 is usually a digital micrometer 411 with a display screen 4112. The display screen 4112 can display the moving distance of the core shaft 4111. The user can calculate the distance between the two detection rods 310 based on the data displayed on the display screen 4112, and then obtain the diameter of the simulated rotor, thereby reducing the time cost spent by the user on manual readings and further improving the user experience.

[0035] Reference Figure 4 and Figure 5(For ease of observation, the display structure has been omitted), it can be understood that the spreading mechanism 210 includes a finger cylinder 211 and two levers 212, the finger cylinder 211 is installed on the frame 100, and two output ends of the finger cylinder 211 are respectively installed with two connecting plates 213, the connecting plates 213 are correspondingly connected to the levers 212, the two levers 212 are symmetrically arranged about the center of the mounting groove 201 and are both penetrated through the mounting groove 201, and the finger cylinder 211 is used to drive the two levers 212 to move toward or away from each other. It should be noted that the brushes in the motor usually rely on the elastic force of the spring sheet to abut against the side wall of the rotor, and the brushes and the spring sheets connected to the brushes are arranged in point symmetry with the rotor as the center point. Therefore, the two levers 212 need to be arranged into a point symmetric structure with the center of the mounting groove 201 as the center point. In the initial state, the distance between the two levers 212 is the smallest. After the user installs the motor, the two levers 212 are located between the two spring sheets. Then the finger cylinder 211 drives the two connecting sheets 213 to move backwards, and the two connecting sheets 213 drive the two levers 212 to move backwards, thereby stretching the two spring sheets to separate the two brushes of the motor, making it easier for the detection rod 310 to be inserted between the two brushes. Then the finger cylinder 211 will drive the two levers 212 to move toward each other through the connecting sheet 213, so that the brushes and the detection rod 310 are correspondingly abutted, avoiding the pressure between the lever 212 and the spring sheet affecting the detection structure. By setting the finger cylinder 211, the brushes of the motor can be easily separated, further reducing the labor intensity of the user.

[0036] Furthermore, the frame 100 is equipped with a lifting cylinder 140, the output end of which is connected to the finger cylinder 211, and the lifting cylinder 140 is used to drive the mounting seat 200 to move in the vertical direction. When the user needs to detect the contact pressure of the motor, the lifting cylinder 140 will first drive the mounting seat 200 to rise. After the user installs the motor in the mounting groove 201, the finger cylinder 211 drives the lever 212 to separate the brushes of the motor, and then the lifting cylinder 140 drives the mounting seat 200 to descend, so that the detection rod 310 is inserted between the two brushes. By setting the lifting cylinder 140, the lifting cylinder 140 and the finger cylinder 211 cooperate to realize the fully automatic installation of the motor, further improve the detection efficiency of the detection machine, and facilitate user use.

[0037] Reference Figure 4 and Figure 6It is understandable that the frame 100 is provided with a speed regulating valve 150, and the speed regulating valve 150 is respectively connected to the finger cylinder 211 and the lifting cylinder 140 through a plurality of air pipes (not shown in the figure). By setting the speed regulating valve 150, the speed regulating valve 150 can control the moving speed of the output ends of both the finger cylinder 211 and the lifting cylinder 140, so as to avoid the problem that the lever 212 moves too fast and the spring sheet is damaged, and at the same time, it is also avoided that the mounting seat 200 is lifted and lowered too fast, so that when the detection rod 310 is inserted into the brush, the detection rod 310 and the brush bracket 434 are rubbed and strained, which effectively prolongs the service life of the detection machine, improves the safety of the detection machine, and effectively enhances the protection of the detection machine to the motor to be tested.

[0038] It should be noted that the frame 100 is also equipped with a pressure regulating filter valve 160, which is also connected to the finger cylinder 211 and the lifting cylinder 140 through multiple air pipes (not shown in the figure). By setting the pressure regulating filter valve 160, the finger cylinder 211 and the lifting cylinder 140 can be filtered to reduce the loss of the finger cylinder 211 and the lifting cylinder 140, and further extend the service life of the detection machine.

[0039] It should also be noted that the frame 100 is also provided with a control system 500, which includes a switch 510 and a display 520. The switch 510 is installed in front of the frame 100, and the switch 510 is electrically connected to the finger cylinder 211 and the lifting cylinder 140 respectively. By setting the switch 510, the user can freely control the start and stop of the finger cylinder and the lifting cylinder 140, thereby facilitating the user to load and unload the motor, and further improving the detection efficiency of the detection machine. The display 520 is installed at the rear of the frame 100, and the display 520 is electrically connected to the digital micrometer 411 and the tension sensor 330 respectively. By setting the display 520, the user can directly observe the rotor diameter simulated by the current detection rod 310 and the contact pressure between the point and the detection rod 310, and the control system 500 can also have a built-in analysis program to analyze these data and display them on the display 520. By setting the display 520, the user can simply and directly observe the contact pressure and other data that need to be measured, which greatly improves the user's experience and improves the product competitiveness of the detection machine.

[0040] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the purpose of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A pressure testing machine, characterized in that: include: The frame is provided with a mounting seat, the mounting seat is provided with a mounting groove, the mounting groove is used to install the motor to be tested, and the mounting seat is also provided with a propping mechanism, the propping mechanism is used to prop open two brushes of the motor to be tested; Two detection mechanisms, the detection mechanisms comprising a detection rod, a connecting frame and a tension sensor, the tension sensor being mounted on the frame, the connecting frame being slidably mounted on the frame, the two ends of the connecting frame being respectively connected to the detection end of the tension sensor and the detection rod, the two detection mechanisms being symmetrically arranged, the two detection rods being located between the two brushes and respectively abutting against the two brushes, and the force exerted by the brushes on the detection rods being transmitted to the tension sensor via the connecting frame; The frame is provided with two adjusting mechanisms, and the adjusting mechanism and the detection mechanism are arranged correspondingly. The adjusting mechanism includes a driving member, a connecting block and a slide. The tension sensor is installed on the slide, the connecting frame is slidably installed on the slide, and the slide is slidably installed on the frame. The sliding direction of the slide is the same as the sliding direction of the connecting frame. The driving member is installed on the frame, and the output end of the driving member is connected to the slide through the connecting block. The two driving members are used to drive the two detection rods to move toward or away from each other. The driving member is set as a micrometer, and the micrometer is installed on the frame. The core shaft of the micrometer is connected with a connector, and the connector is provided with a bearing. One end of the connecting block is bolted to the slide, and the other end is installed with a fixed shaft. The fixed shaft is provided with a limiting portion at one end facing the micrometer, and the bearing sleeve is set on the fixed shaft and is located between the connecting block and the limiting portion.

2. A pressure testing machine according to claim 1, characterized in that: The spreading mechanism includes a finger cylinder and two levers. The finger cylinder is installed on the frame. Two connecting plates are respectively installed on the two output ends of the finger cylinder. The connecting plates are correspondingly connected to the levers. The two levers are symmetrically arranged and both pass through the mounting grooves. The finger cylinder is used to drive the two levers to move toward or away from each other.

3. A pressure testing machine according to claim 1, characterized in that: The frame is provided with a zero position block, and both of the two slides are provided with a positioning block. The slides are moved so that the positioning block abuts against the zero position block, thereby moving the detection rod to the center of the installation groove.

4. A pressure testing machine according to claim 3, characterized in that: The frame is provided with a first slide rail, the slide platform is provided with a first slider slidably matched with the first slide rail, the frame is connected with a first limit block, the first limit block is located at one end of the first slide rail away from the zero position block, and the first limit block protrudes upward from the first slide rail.

5. A pressure testing machine according to claim 3, characterized in that: The slide table is provided with a second slide rail, the connecting frame is provided with a second slider slidably matched with the second slide rail, the tension sensor is connected to a bracket, the bracket is provided with a second limit block at one end away from the tension sensor, the second limit block is connected to the slide table, and the second limit block is used to limit the sliding of the second slider.

6. A pressure testing machine according to claim 1, characterized in that: The mounting seat is provided with a vertically arranged guide rod, the guide rod is slidably connected with a pressure block along the vertical direction, and the pressing end of the pressure block is located above the mounting groove.

7. A pressure testing machine according to claim 2, characterized in that: The frame is equipped with a lifting cylinder, the output end of which is connected to the mounting seat, and the lifting cylinder is used to drive the mounting seat to move in a vertical direction.

8. A pressure testing machine according to claim 7, characterized in that: The frame is provided with a speed regulating valve, and the speed regulating valve is respectively connected with the finger cylinder and the lifting cylinder through a plurality of air pipes.

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