CN210775055U

CN210775055U - Pressure testing machine

Info

Publication number: CN210775055U
Application number: CN201921396448.4U
Authority: CN
Inventors: 曾小锋; 朱福林; 张家郡; 陈巨喜
Original assignee: Hengyang Kaixin Special Materials Technology Co ltd
Current assignee: Hengyang Jiazhun Technology Co ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-06-16
Anticipated expiration: 2029-08-26

Abstract

The utility model relates to a pressure test machine. The pressure tester comprises a machine body, a driving piece, a pressing piece and a pressure sensor. The machine body is provided with a pressure testing station. The driving piece is installed in the organism, including pneumatic cylinder and with the pneumatic cylinder of the coaxial setting of pneumatic cylinder, the pneumatic cylinder includes the pneumatic cylinder body and runs through the pneumatic piston rod of pneumatic cylinder body, the pneumatic cylinder includes hydraulic piston rod, the scalable one end butt with pneumatic piston rod of hydraulic piston rod. The pressing piece is arranged at one end of the pneumatic piston rod, which is far away from the hydraulic piston rod, and is aligned with the pressure testing station. The pressing piece is used for providing pressure for the piece to be measured. The pressure sensor is used for detecting the pressure value provided by the pressing element. The utility model provides a pressure test machine's test precision is higher.

Description

Pressure testing machine

Technical Field

The utility model relates to a pressure test technical field especially relates to a pressure test machine.

Background

When testing the thermal shock resistance of the ceramic, a piece to be tested prepared from the ceramic is placed on a pressure testing machine for pressure testing. And the pressure tester applies pressure to the piece to be tested for multiple times until the piece to be tested is broken. The number of the pressing times can facilitate the visual and qualitative judgment of the thermal shock resistance of the ceramic. However, in the pressure testing machine in the prior art, the pressure output is easy to fluctuate in the pressure testing process, so that the testing accuracy is poor, and the evaluation result of the thermal shock resistance of the ceramic is inaccurate.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a pressure testing machine with high testing accuracy for the problem of poor testing accuracy of the conventional pressure testing machine.

A pressure testing machine, comprising:

the pressure testing device comprises a machine body, a pressure testing station and a pressure testing device, wherein the machine body is provided with the pressure testing station;

the driving part is arranged on the machine body and comprises a pneumatic cylinder and a hydraulic cylinder which is coaxial with the pneumatic cylinder, the pneumatic cylinder comprises a pneumatic cylinder body and a pneumatic piston rod which penetrates through the pneumatic cylinder body, the hydraulic cylinder comprises a hydraulic piston rod, and the hydraulic piston rod can stretch to abut against one end of the pneumatic piston rod;

the pressing piece is arranged at one end of the air pressure piston rod, which is far away from the hydraulic piston rod, and is aligned with the pressure testing station in position, and the pressing piece is used for providing pressure for the piece to be tested;

and the pressure sensor is used for detecting the pressure value provided by the pressing piece.

In one embodiment, the hydraulic cylinder further comprises a controller, and the controller is electrically connected with the pressure sensor and the hydraulic cylinder.

In one embodiment, the pneumatic control device further comprises an air pressure regulating valve and a hydraulic regulating valve, wherein the air pressure regulating valve is communicated with the interior of the pneumatic cylinder through the hydraulic regulating valve, lubricating oil is contained in the hydraulic regulating valve, and gas passing through the air pressure regulating valve penetrates through the lubricating oil and then enters the interior of the pneumatic cylinder.

In one embodiment, one side of the pressing piece facing the pressure testing station is recessed to form an abutting through groove.

In one embodiment, the pressure testing device further comprises an elastic pad, wherein the elastic pad is arranged on one side surface of the pressing element facing the pressure testing station.

In one embodiment, the machine body comprises a base and two clamping blocks, the base is provided with a testing surface, and the two clamping blocks are arranged on the testing surface at intervals and define a pressure testing station together with the testing surface.

In one embodiment, the testing surface is provided with a strip-shaped fixing groove, each of the two clamping blocks comprises a clamping block body and an installation block connected with the clamping block body, the clamping block body is borne on the testing surface, and the installation blocks are clamped with the fixing groove.

In one embodiment, the surfaces of the two clamping blocks facing each other are recessed to form mounting grooves.

In one embodiment, the device further comprises a guide rail and a connecting block, wherein the guide rail is mounted on the machine body and extends along a direction parallel to a connecting line of the driving piece and the pressing piece, the driving piece is connected with the guide rail through the connecting block, and the driving piece is operable to slide along the extending direction of the guide rail.

In one embodiment, the pneumatic anti-rotation device further comprises an anti-rotation block and a connecting rod, the pneumatic piston rod penetrates through the anti-rotation block, and the anti-rotation block is connected with the connecting block through the connecting rod.

When the pressure test machine is used for carrying out pressure test, the piece to be tested is placed on the pressure test station, the pneumatic cylinder is started, the pneumatic piston rod drives the pressing piece to slide to the pressure test station under the driving of air pressure, and the pressing piece provides pressure for the piece to be tested. The pressure sensor can detect the pressure value provided by the pressing piece, when the pressure value is smaller than the preset value, the hydraulic piston rod extends and abuts against one end of the air pressure piston rod, acting force towards the pressing piece is applied to the air pressure piston rod, and the acting force is superposed with the air pressure difference of the air pressure cylinder, so that the stress of the air pressure piston rod is increased. The pressing piece is arranged on the air pressure piston rod, so that the pressure provided by the pressing piece is increased. When the pressure value is larger than the preset value, the hydraulic piston rod retracts, an acting force which is back to the pressing piece is exerted on the pneumatic piston rod, the acting force is offset with the air pressure difference in the pneumatic cylinder, the stress of the pneumatic piston rod is reduced, and further, the pressure provided by the pressing piece is reduced, so that the pressure value is maintained at the preset value. Therefore, the pressure testing machine can maintain the pressure value of the pressing piece acting on the piece to be tested at the preset value in the process of carrying out pressure testing on the piece to be tested, and has higher testing accuracy.

Drawings

Fig. 1 is a schematic view of the overall structure of a pressure testing machine according to a preferred embodiment of the present invention;

fig. 2 is a side view of the pressure tester shown in fig. 1.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and fig. 2, the present invention provides a pressure testing machine 100 for testing a pressure of a test object 200. Specifically, the test piece 200 may be a ceramic product. Before pressure testing, the ceramic article is rapidly heated and then cooled. The cooled ceramic product is placed on a pressure tester 100, and the pressure tester 100 applies pressure to the ceramic product. If the ceramic product is not broken, the heating, cooling and pressing are continued, and the cycle is continued until the ceramic product is broken by the pressure testing machine 100. The more cycles the ceramic article undergoes before breaking, the better the thermal shock resistance.

Pressure tester 100 includes a body 110, a driving member 120, a pressing member 130, and a pressure sensor (not shown).

The body 110 plays a supporting and mounting role. The body 110 is provided with a pressure test station. Specifically, the body 110 includes a frame 115, two mounting frames 114, a base 111, and two clamping blocks 112. The frame 115 is elongated. When pressure testing machine 100 is placed on a horizontal surface, frame 115 extends in a vertical direction. The two mounting brackets 114 are respectively disposed on two opposite sides of the frame 115. The bases 111 are spaced apart from one side of the frame 115 adjacent to the mounting frame 114 and are connected by a connecting frame 113. The base 111 has a test surface 1111. The test surface 1111 is disposed parallel to the horizontal plane.

Specifically, the base 111 has a rectangular parallelepiped shape and extends in the horizontal direction. The testing surface 1111 of the base 111 is formed with a strip-shaped fixing groove 1112, and the fixing groove 1112 is located in the middle of the base 111 and extends to the edges of the two ends of the base 111 along the length direction of the base 111. The test surface 1111 of the base 111 is further provided with a spacing hole 1113, the diameter of the spacing hole 1113 is larger than the width of the fixing groove 1112, the spacing hole 1113 is communicated with the fixing groove 1112, and the depth of the spacing hole 1113 is larger than the depth of the fixing groove 1112.

The two clamping blocks 112 are spaced apart from the testing surface 1111 and define a pressure testing station together with the testing surface 1111.

Specifically, both clamping blocks 112 extend along the length of the frame 115. When the pressure test is performed, the device 200 to be tested is placed in the pressure test station and clamped between the two clamping blocks 112. Through setting up base 111 and two clamp splice 112, two clamp splice 112 intervals set up in test surface 1111 to define jointly with test surface 1111 and form the pressure test station, before the pressure test, directly with the piece 200 that awaits measuring centre gripping alright realize the fixing of the piece 200 that awaits measuring between two clamp splice 112, make the installation of the piece 200 that awaits measuring simple, be convenient for improve the efficiency of pressure test.

Further, in an embodiment, the two clamping blocks 112 each include a clamping block body 1121 and a mounting block 1122 connected to the clamping block body 1121. The clamping block body 1121 is supported on the testing surface 1111, and the mounting block 1122 is clamped with the fixing groove 1112.

Specifically, the mounting block 1122 is fixedly connected to the clamping block body 1121. The clamping block body 1121 is supported on the testing surface 1111, and the two mounting blocks 1122 are disposed on the surface of the clamping block body 1121 facing the testing surface 1111 and clamped in the fixing groove 1112 to fix the two clamping block bodies 1121. The two clamp block bodies 1121 and the testing surface 1111 together define a pressure testing station. The groove wall of the fixing groove 1112 has clamping and limiting effects on the mounting block 1122, so that the mounting block 1122 and the clamping block body 1121 can be prevented from shaking under the action of external force, and the connection between the clamping block body 1121 and the base 111 is more stable and reliable. Therefore, when the to-be-tested object 200 is mounted at the pressure testing station, the to-be-tested object 200 can also be stably fixed between the two clamping block bodies 1121, so that the reliability of the test of the pressure testing machine 100 is higher.

In addition, the clamping manner also makes the mounting manner of the clamping block body 1121 and the base 111 simpler, which is convenient for improving the mounting efficiency of the clamping block body 1121.

In addition, since the fixing groove 1112 is in a long strip shape, and two ends of the fixing groove 1112 extend to two end edges of the base 111, when the clamping block body 1121 is installed, the two installation blocks 1122 can be respectively installed from two end openings of the fixing groove 1112, and slide along the fixing groove 1112 under the action of external pushing force, and approach each other to clamp the device under test 200. When the length of the device under test 200 changes, the two clamping blocks 112 can be operated to slide in the directions away from each other, so that the distance between the two clamping blocks 112 is adapted to the length of the device under test 200.

Further, the depth of the fixing groove 1112 is greater than the size of the mounting block 1122 in the vertical direction. When the mounting block 1122 is clamped in the fixing groove 1112, the mounting block 1122 is spaced from the bottom of the fixing groove 1112. Therefore, the contact area between the mounting block 1122 and the groove wall of the fixing groove 1112 can be reduced, and the friction force between the mounting block 1122 and the groove wall of the fixing groove 1112 can be reduced, so that the effort is saved in the process of pushing the two clamping block bodies 1121 to approach or move away from each other.

In one embodiment, the pressure testing machine 100 further includes a fastener, the clamp blocks 112 are L-shaped block structures, and include a first plate 11211 parallel to the testing surface 1111 and a second plate 11212 perpendicular to the testing surface 1111, the first plates 11211 on the two clamp blocks 112 are disposed opposite to each other and spaced apart, and the second plates 11212 on the two clamp blocks 112 extend in directions away from each other. Each second plate 11212 is provided with a mounting hole 194, and a fastener is inserted into the mounting hole 194 and the fixing groove 1112.

Specifically, the mounting block 1122 on each clamping block 112 is disposed on the first plate 11211, and the first plate 11211 on each clamping block 112 is disposed in a staggered manner with respect to the mounting hole 194. The fastening member is inserted into the mounting hole 194 and the fixing groove 1112, and can further fix the clamping block bodies 1121 to prevent the two clamping block bodies 1121 and the base 111 from being loosened and sliding or swaying, so that the to-be-tested device 200 can be stably mounted between the two clamping block bodies 1121, and the pressure testing machine 100 has better testing reliability.

The clamp block 112 can be stably mounted on the base 111 by combining the fastening member and the limit function of the fixing groove 1112. Therefore, in the process of pressure testing the device under test 200, the two clamping blocks 112 do not slide relatively, and the device under test 200 can be stably supported on the base 111, so as to improve the reliability of the pressure testing machine 100.

Further, the surfaces of the two clamping blocks 112 facing each other are recessed to form mounting grooves 1123.

Specifically, the surfaces of the two first plates 11211 facing each other form a mounting groove 1123, and one side of the mounting groove 1123 extends to the side of the first plate 11211 facing away from the test surface 1111, i.e., the side of the mounting groove 1123 extends to the top surface of the first plate 11211. When the piece to be tested 200 is installed, the two opposite ends of the piece to be tested 200 are respectively placed into the installation grooves 1123 from the top surfaces of the two first plates 11211 and are tightly clamped with the installation grooves 1123. The groove walls of the mounting groove 1123 have a limiting effect on the to-be-tested piece 200, so that the to-be-tested piece 200 can be prevented from sliding relative to the two clamping blocks 112, and the pressure test on the to-be-tested piece 200 can be conveniently performed.

Further, in one embodiment, the wall of the mounting groove 1123 is a circular arc surface, and the inner diameter thereof gradually decreases in the direction from the top surface of the first plate 11211 to the testing surface 1111.

Generally, the device under test 200 is a cylindrical structure, and the groove wall of the mounting groove 1123 with the arc surface can be better attached to the surface of the cylindrical structure, thereby effectively increasing the contact area between the device under test 200 and the groove wall of the mounting groove 1123. Therefore, the friction between the dut 200 and the wall of the mounting groove 1123 is increased, preventing the dut 200 from sliding relative to the clamping block 112, which facilitates the reliability of the pressure test.

In addition, the inner diameter of the mounting groove 1123 gradually decreases in the direction from the top surface of the first plate 11211 to the test surface 1111, and during the process that the to-be-tested object 200 is put into the mounting groove 1123 from the top surface of the first plate 11211, the surface of the to-be-tested object 200 can gradually fit and be tightly clamped with the groove wall of the mounting groove 1123, so that the to-be-tested object 200 can be conveniently clamped. Similarly, when the to-be-tested piece 200 is separated from the mounting groove 1123, the to-be-tested piece 200 can be gradually separated from the wall of the mounting groove 1123, so as to facilitate the separation of the to-be-tested piece 200.

It should be noted that, in other embodiments, the mounting groove 1123 may also be changed according to the shape of the dut 200. For example, when the device under test 200 has a triangular pyramid shape, the groove wall of the mounting groove 1123 may have a V-shaped surface.

The driving member 120 is mounted on the body 110 and includes a pneumatic cylinder 121 and a hydraulic cylinder 122 coaxially disposed with the pneumatic cylinder 121. The pneumatic cylinder 121 includes a pneumatic cylinder 1212 and a pneumatic piston rod 1211 extending through the pneumatic cylinder 1212. The hydraulic cylinder 122 includes a hydraulic piston rod 1221. The hydraulic piston rod 1221 is extendable and retractable to abut against one end of the pneumatic piston rod 1211. Specifically, the driving member 120 is located above the base 111 and is disposed on the frame 115. When the pneumatic cylinder 121 and the hydraulic cylinder 122 are coaxially disposed, the hydraulic cylinder 122 is also located above the pneumatic cylinder 121. The pneumatic piston rod 1211 is positionally aligned with the hydraulic piston rod 1221.

The pneumatic cylinder 121 also includes a pneumatic piston (not visible). The pneumatic cylinder 1212 is a hollow mechanism having an air chamber. The air pressure piston is accommodated in the air cavity and separates the air cavity into a first air cavity and a second air cavity. The first air chamber is located on the upper side of the second air chamber. The first air cavity and the second air cavity are filled with air. The inner walls of the first air cavity and the second air cavity are also provided with a first air hole and a second air hole which are respectively communicated with the first air cavity and the second air cavity. The first air hole and the second air hole are respectively provided with a first air pressure valve and a second air pressure valve. The pressure testing machine 100 is provided with an air source outside, the air source is communicated with a first air pressure valve and a second air pressure valve, and the first air pressure valve and the second air pressure valve are used for respectively controlling air intake of the first air hole and the second air hole.

A pneumatic piston rod 1211 is installed at one side of the pneumatic piston. Specifically, the pneumatic piston rod 1211 is disposed at a lower side of the pneumatic piston. The pneumatic piston rod 1211 is disposed through the second air chamber and extends out of the pneumatic cylinder 1212.

Specifically, when the first air pressure valve is opened and the second air pressure valve is closed, the air source can inflate the air pressure in the first air cavity into the first air cavity to be greater than the air pressure in the second air cavity, and air pressure difference is generated on two sides of the air pressure piston. The pneumatic piston is pushed to slide the pneumatic piston rod 1211 downward, so that the portion of the pneumatic piston rod 1211 extending out of the pneumatic cylinder 1212 is increased. In the process of inflating the first air cavity, the volume of the first air cavity is increased, and the volume of the second air cavity is gradually reduced. To prevent the pneumatic piston rod 1211 from being pushed hard due to the excessive air pressure in the second air chamber, the second air chamber should be properly deflated while the first air chamber is inflated.

When the pneumatic piston rod 1211 needs to be reset, the second pneumatic valve is opened, the first pneumatic valve is closed, and the air source inflates the second air cavity. The air pressure in the second air cavity is gradually greater than that in the first air cavity, and the air pressure difference between the second air cavity and the first air cavity pushes the air pressure piston to drive the air pressure piston rod 1211 to reset. Meanwhile, the first air cavity is deflated. After the pneumatic piston rod 1211 is reset, the air volumes in the first air cavity and the second air cavity are restored to the initial values before the pneumatic piston rod 1211 is started.

The hydraulic cylinder 122 further includes a hydraulic cylinder body 1222 (and a hydraulic piston (not shown), the hydraulic cylinder body 1222 is a hollow mechanism having a hydraulic cavity, the hydraulic piston is received in the hydraulic cavity, and separates the hydraulic cavity into a first hydraulic cavity and a second hydraulic cavity, the first hydraulic cavity is located on the upper side of the second hydraulic cavity, the first hydraulic cavity and the second hydraulic cavity are filled with liquid, the inner walls of the first hydraulic cavity and the second hydraulic cavity are further provided with a first hydraulic hole and a second hydraulic hole respectively communicated with the first hydraulic cavity and the second hydraulic cavity, the first hydraulic hole and the second hydraulic hole are respectively provided with a first hydraulic valve and a second hydraulic valve, a hydraulic source is arranged outside the pressure testing machine 100 and is communicated with the first hydraulic valve and the second hydraulic valve, and the first hydraulic valve and the second hydraulic valve are used for respectively controlling the liquid inlet of the first hydraulic hole and the second hydraulic hole.

The hydraulic piston rod 1221 is mounted to one side of the hydraulic piston. Specifically, the hydraulic piston rod 1221 is disposed on the lower side of the hydraulic piston. The hydraulic piston rod 1221 is inserted into the second hydraulic chamber and extends out of the hydraulic cylinder 1222.

Specifically, when the first hydraulic valve is opened and the second hydraulic valve is closed, the hydraulic source can fill liquid into the first hydraulic cavity, the liquid in the first hydraulic cavity is increased, and hydraulic pressure difference is generated on two sides of the hydraulic piston. The hydraulic piston is pushed to slide down the hydraulic piston rod 1221, so that the part of the hydraulic piston rod 1221 extending out of the hydraulic cylinder 1222 is increased. In the process of feed liquor in the first hydraulic cavity, the volume of the first hydraulic cavity is increased, and the volume of the second hydraulic cavity is gradually reduced. In order to prevent the piston rod from being pushed difficultly due to overlarge hydraulic pressure in the second hydraulic cavity, the second hydraulic cavity should be drained properly at the same time when the first hydraulic cavity feeds liquid.

When the hydraulic piston rod 1221 needs to retract, the second hydraulic valve is opened, the first hydraulic valve is closed, and liquid enters the second hydraulic cavity. The hydraulic pressure in the second hydraulic pressure chamber is gradually greater than the hydraulic pressure in the first hydraulic pressure chamber, and the hydraulic piston drives the hydraulic piston rod 1221 to partially retract into the hydraulic cylinder 1222. At the same time, the first hydraulic chamber is also drained.

In this embodiment, the end of the hydraulic piston rod 1221 extending out of the second hydraulic chamber is also connected to the pneumatic piston rod 1211. One end of the hydraulic piston rod 1221 is extendable to abut against one end of the pneumatic piston rod 1211. Specifically, when the hydraulic cylinder 122 is activated, the hydraulic piston rod 1221 slides in its axial direction, so that the portion of the hydraulic piston rod 1221 extending out of the hydraulic cylinder body 1222 is increased and abuts against one end of the pneumatic piston rod 1211. At this time, the hydraulic piston rod 1221 applies a force toward the pressure test station to the pneumatic piston rod 1211. Alternatively, when the hydraulic cylinder 122 is activated, the hydraulic piston rod 1221 slides along its axial direction, and gradually retracts to the hydraulic cylinder body 1222, and at this time, the portion of the hydraulic piston rod 1221 extending out of the hydraulic cylinder body 1222 is reduced, and the hydraulic pressure applies a force to the pneumatic piston rod 1211 facing away from the pressure test station. When the hydraulic cylinder 122 is not actuated, there is no functional relationship between the hydraulic piston rod 1221 and the pneumatic piston rod 1211.

Specifically, the action relationship between the hydraulic piston rod 1221 and the pneumatic piston rod 1211 is realized by a pneumatic piston. The end of the hydraulic piston rod 1221 extending out of the second hydraulic chamber is connected to the end of the pneumatic piston facing away from the pneumatic piston rod 1211. Specifically, the hydraulic piston rod 1221 and the pneumatic piston may be connected by a rope, a lock catch, or the like, and a certain buffering distance is provided between the hydraulic piston rod 1221 and the pneumatic piston. In this embodiment, the pneumatic cylinder 121 may be operated alone or in cooperation with the hydraulic cylinder 122. When the pneumatic cylinder 121 is started alone, no force acts between the hydraulic piston rod 1221 and the pneumatic piston, and when both the pneumatic cylinder 121 and the hydraulic cylinder 122 are started, the hydraulic piston rod 1221 moves downward to gradually abut against the pneumatic piston and drive the pneumatic piston to drive the pneumatic piston rod 1211 to move downward. At this time, the hydraulic pressure difference in the first hydraulic chamber and the second hydraulic chamber acts on the air pressure piston through the hydraulic piston and the hydraulic piston rod 1221, and is superimposed with the air pressure difference on the air pressure piston, so that the downward pressure difference acting on the air pressure piston is increased. This pressure difference acts on the pneumatic piston rod 1211 through the pneumatic piston, so that the downward pressure difference of the pneumatic piston rod 1211 increases. When the hydraulic piston rod 1221 moves upward, the hydraulic piston rod 1221 moves to a certain distance, and then the pneumatic piston is pulled to drive the pneumatic piston rod 1211 to move upward. At this time, the hydraulic pressure in the first hydraulic pressure chamber is smaller than the hydraulic pressure in the second hydraulic pressure chamber. The hydraulic piston creates an upward hydraulic pressure differential. The hydraulic pressure difference can offset part of the downward pressure difference on the pneumatic piston, so that the downward pressure difference applied to the pneumatic piston is reduced.

The pressing member 130 is used to provide pressure to the dut 200. The press member 130 is mounted on the end of the pneumatic piston rod 1211 remote from the hydraulic piston rod 1221 and is aligned with the pressure test station position.

Specifically, when the pneumatic cylinder 121 is independently actuated, the pressing member 130 is subjected to a pressure difference between the first air chamber and the second air chamber. When the air pressure of the first air chamber is greater than that of the second air chamber, the air pressure piston is pushed and slides downward. The pneumatic piston rod 1211 and the pressing member 130 slide downward under the driving of the piston until contacting the device under test 200. Along with the continuous input of the gas in the second gas cavity, the gas pressure difference between the first gas cavity and the second gas cavity is continuously increased, the pressing member 130 is blocked by the to-be-detected member 200, the sliding is stopped, but the pressure applied to the to-be-detected member 200 is also continuously increased, and the pressure value is equal to the pressure difference between the second gas cavity and the first gas cavity. When the pressure value is increased to the preset value, the second air cavity stops air transmission, the first air cavity stops air release, the pressing piece 130 keeps the pressure at the preset value for 5s, and the pressure test is carried out on the to-be-tested piece 200. After 5s, the second air cavity is filled with air, the first air cavity is deflated, and the air pressure piston drives the air pressure piston rod 1211 and the pressing member 130 to slide upwards until the pressing member 130 is separated from the to-be-tested member 200.

A pressure sensor (not shown) for detecting a pressure value provided by the pressing member 130.

Specifically, since the volume of the air source is constant, when the air source inputs air into the first air chamber, the pneumatic pressure in the air source fluctuates due to the decrease of the air, and the air pressure difference in the pneumatic cylinder 121 also fluctuates. The pressure provided by the pressing member 130 to the device under test 200 is derived from the air pressure difference between the second air chamber and the first air chamber, and therefore, the pressure provided by the pressing member 130 fluctuates. When the pressure holding is performed, the pressure value may not be maintained at the preset value. Furthermore, in the process of multiple cycle tests of the to-be-tested part 200, the influence of pressure fluctuation on the pressure test result cannot be eliminated, so that the performance of the to-be-tested part 200 cannot be accurately evaluated.

In the present embodiment, during pressure maintaining, if the pressure value is smaller than the preset value, the hydraulic cylinder 122 is activated, and the portion of the hydraulic piston rod 1221 extending out of the hydraulic cylinder 1222 is increased. The hydraulic piston rod 1221 gradually abuts one end of the pneumatic piston rod 1211, and applies a hydraulic pressure difference toward the pressing member 130 to the pneumatic piston rod 1211. This hydraulic pressure difference is superimposed on the air pressure difference of the pneumatic cylinder 121, so that the downward pressure of the pneumatic piston rod 1211 increases. The pressing member 130 is mounted on the air cylinder rod 1211, and thus, the pressure provided by the pressing member 130 is also increased. When the pressure value is greater than the preset value, the hydraulic cylinder 122 is also activated, the portion of the hydraulic piston rod 1221 that retracts into the hydraulic cylinder 1222 is increased, and the portion that extends out of the hydraulic cylinder 1222 is decreased. The hydraulic piston rod 1221 generates an upward hydraulic pressure difference, which offsets the air pressure difference of the hydraulic cylinder and the pneumatic cylinder 121, so that the downward pressure of the pneumatic piston rod 1211 decreases. The pressing member 130 is mounted on the air cylinder rod 1211, and thus, the pressure provided by the pressing member 130 is also reduced. Therefore, under the action of the hydraulic cylinder 122 and the pneumatic cylinder 121, the pressure exerted on the device under test 200 by the pressing member 130 during the pressing process can be maintained at a predetermined value, and thus the testing accuracy is high.

In one embodiment, the pressure testing machine 100 further includes a controller (not shown) electrically connected to the pressure sensor and the hydraulic cylinder 122.

The controller is configured to control the actuation of the hydraulic cylinder 122 according to the pressure value, so that the hydraulic piston rod 1221 applies a force to the pneumatic piston rod 1211 towards or away from the pressing member 130. Specifically, indicator lights associated with the controller, control displays, and the like are mounted on one of the mounts 114. The body 110 is also provided with a switch 192 for triggering the controller.

During pressure maintaining, if the pressure value is smaller than the preset value, the controller controls the hydraulic cylinder 122 to start, so that the pressure provided by the pressing member 130 to the device under test 200 is increased and increased to the preset value. If the pressure value is greater than the predetermined value, the controller also controls the hydraulic cylinder 122 to start, the hydraulic piston rod 1221 moves upward for a certain distance, and pulls the pneumatic piston rod 1211 to move upward, the upward hydraulic pressure difference between the first hydraulic cylinder 122 and the second hydraulic cylinder 122 can cancel out a part of the pneumatic pressure difference in the pneumatic cylinder 121, so that the pressure difference acting on the pneumatic piston is reduced, the force applied by the applying member 130 is also reduced, and the pressure provided by the applying member is also reduced to the predetermined value. Therefore, the controller is provided so that the pressure tester 100 makes the start and operation of the hydraulic cylinder 122 more intelligent.

In addition, in the present embodiment, the pressure applied by the pressing member 130 on the device under test 200 generally needs to be relatively large. If the hydraulic cylinder 122 providing a larger pressure is used alone, the pressure test may be inconvenient due to the higher cost and larger volume of the hydraulic cylinder 122. In the present application, however, the pneumatic cylinder 121 plays a major role in pressing the pressing member 130. The cylinder is smaller and cheaper to use given that the same force can be applied to the pressing member 130. Because the range of pressure fluctuations resulting from gas fluctuations is relatively small, the hydraulic cylinder 122 of the present application is relatively small in volume and has a limited ability to provide pressure. The hydraulic cylinder 122 only requires a fine adjustment of the applied force, and therefore the cost of the hydraulic cylinder 122 in this application is relatively low. Therefore, by providing the pneumatic cylinder 121 and the hydraulic cylinder 122, the pressure test has better accuracy, and the production cost of the pressure tester 100 can be reduced.

In one embodiment, pressure testing machine 100 further includes a position sensor (not shown). The position sensor is disposed on the pressing member 130 and electrically connected to the controller. The position sensor detects the position of the pressing member 130, and the controller controls the amount of air input and output of the pneumatic cylinder 121 according to the position of the pressing member 130.

Specifically, in order to have enough space to facilitate the installation of the device under test 200, the pressing member 130 is spaced from the pressure testing station before the pneumatic cylinder 121 and the hydraulic cylinder 122 are not activated. When the member to be measured 200 is completely installed, the pneumatic cylinder 121 first drives the pressing member 130 to slide downward. At first, the distance between the pressing member 130 and the to-be-tested member 200 is relatively long, so as to improve the pressure testing efficiency, control the air input in the first air cavity and the air output in the second air cavity, and control the descending speed of the pressing member 130 at 10 mm/s. When the position sensor detects that the distance between the pressing member 130 and the to-be-detected element 200 is 5mm, the controller controls the air inflow in the first air cavity and the air outflow in the second air cavity to control the descending speed of the pressing member 130 to be 1mm/s, so that the pressing member 130 is prevented from descending too fast to generate excessive impact with the to-be-detected element 200, and the to-be-detected element 200 is prevented from being damaged. The pressing member 130 is gradually lowered until it comes into contact with the member to be measured 200. By providing the position sensor, the position of the pressing member 130 can be detected, and the sliding speed of the pressing member 130 can be controlled, so as to prevent the damage of the object 200 caused by the large impact between the pressing member 130 and the object 200. Meanwhile, the pressing member 130 can be prevented from being damaged by the reverse acting force applied to the pressing member 130 by the member to be tested 200.

In one embodiment, the pressure tester 100 further includes a guide rail 193 and a connection block 160. The guide rail 193 is installed at the body 110 and extends in a direction parallel to a line connecting the driving member 120 and the pressing member 130, the driving member 120 is connected to the guide rail 193 through the connection block 160, and the driving member 120 is operable to be slidable in the extending direction of the guide rail 193. Specifically, the direction of the line connecting the driving member 120 and the pressing member 130 is the vertical direction.

Specifically, sliding the driving member 120 along the guide rail 193 allows coarse adjustment of the distance between the pressing member 130 and the object 200.

Normally, the diameter of the dut 200 is fixed. The connecting block 160 and the guide rail 193 are provided with threaded holes, and screws are arranged in the threaded holes on the connecting block 160 and the guide rail 193 in a penetrating way so as to fix the driving member 120. After the device 200 is placed in the pressure testing station, the pneumatic piston rod 1211 drives the pressing member 130 to slide up and down to complete the pressure testing of the device 200.

If the diameter of the workpiece 200 is increased, the screw can be removed, and the connecting block 160 is operated to drive the driving member 120 to slide upwards along the guide rail 193, so that the distance between the driving member 120 and the pressure measurement station is increased, and a sufficient space is reserved for placing the workpiece 200. If the diameter of the to-be-tested object 200 is reduced, the connecting block 160 is operated to drive the driving member 120 to slide downwards along the guide rail 193, so that the distance between the driving member 120 and the to-be-tested object 200 is reduced, the time for the pressing member 130 to move in the contact process with the to-be-tested object 200 is reduced, and the pressure testing efficiency is improved.

Specifically, in the present embodiment, there are two connection blocks 160, and the pneumatic cylinder 121 and the hydraulic cylinder 122 are respectively connected to the guide rail 193 through the connection blocks 160 in a transmission manner. A through hole is formed in one end of each connecting block 160, the pneumatic cylinder body 1212 penetrates through the through hole of one connecting block 160, and the hydraulic cylinder body 1222 penetrates through the through hole of the other connecting block 160, so that the pneumatic cylinder 121, the hydraulic cylinder 122 and the connecting blocks 160 are fixed. This kind of fixed mode is simple and easy, and need not to use external fastener, can conveniently reduce the manufacturing cost of pressure test machine 100.

It should be noted that, during the process of pushing the pneumatic cylinder 121 and the hydraulic cylinder 122 to slide along the guide rail 193, the pneumatic cylinder 121 and the hydraulic cylinder 122 should move synchronously, and the relative speed between the pneumatic cylinder 121 and the hydraulic cylinder 122 should be zero, so as to prevent the relative buffer distance between the hydraulic cylinder 122 and the pneumatic cylinder 121 from changing and affecting the movement of the pneumatic piston rod 1211 driven by the hydraulic piston rod 1221.

Through the arrangement of the guide rail 193 and the connecting block 160, the guide rail 193 can also guide the sliding of the driving element 120, so that the situation that the contact position of the pressing element 130 and the to-be-tested element 200 is changed due to the shaking of the driving element 120 in the sliding process is prevented, and the test accuracy is affected due to the fact that the contact positions cannot be unified in the process of multiple-cycle testing.

Specifically, in one embodiment, the pressure testing machine 100 further includes an anti-rotation block 170 and a connection rod 180. The air pressure piston rod 1211 is inserted into the rotation preventing block 170, and the rotation preventing block 170 is connected to the connecting block 160 through the connecting rod 180.

Specifically, the rotation-preventing block 170 is provided with a through hole, and one end of the pneumatic piston rod 1211 extending out of the pneumatic cylinder 1212 is inserted through the through hole and is slidable relative to the hole wall of the through hole. The rotation-preventing block 170 is located below the connecting block 160, and two opposite ends of the connecting rod 180 are connected with the rotation-preventing block 170 and the connecting block 160, respectively. The connection block 160 is fixed to the guide rail 193 during the pressure test, and at this time, the position of the anti-rotation block 170 connected to the connection block 160 is also fixed. Therefore, when the air cylinder rod 1211 penetrates through the anti-rotation block 170 and drives the pressing member 130 to slide, the anti-rotation block 170 can guide the air cylinder rod 1211 and prevent the air cylinder rod 1211 from rotating. So as to prevent the contact positions of the pneumatic piston rod 1211 and the pressing member 130 with the device under test 200 from changing. The pneumatic piston rod 1211 and the pressing member 130, which only slide, move relatively stably. Therefore, the pressure applied by the pressing member 130 to the device under test 200 is stable and has small fluctuation, so that the pressure testing machine 100 has better testing effect.

In one embodiment, the hydraulic piston rod 1221 is also connected to the corresponding connecting block 160 of the hydraulic piston rod 1221 through another rotation preventing block 170 and the connecting rod 180, so as to prevent the hydraulic piston rod 1221 from shifting and failing to abut against the pneumatic piston rod 1211 during sliding. In one embodiment, pressure tester 100 further includes a pneumatic pressure regulating valve 140 and a hydraulic pressure regulating valve 150. The air pressure regulating valve 140 is electrically connected to the controller. The air pressure regulating valve 140 communicates with the interior of the pneumatic cylinder 121 through the hydraulic pressure regulating valve 150. The hydraulic pressure adjusting valve 150 contains lubricating oil, and the gas passing through the gas pressure adjusting valve 140 penetrates the lubricating oil and enters the pneumatic cylinder 121.

Specifically, the controller is electrically connected to the air pressure adjusting valve 140, and controls the amount of intake air of the pneumatic cylinder 121 through the air pressure adjusting valve 140.

Specifically, the air pressure adjusting valve 140 is provided with a first air path and a second air path. The first air passage and the second air passage are also respectively communicated with the hydraulic regulating valve 150. The hydraulic pressure control valve 150 contains lubricating oil. The first air passage and the second air passage are respectively communicated with the first electromagnetic valve and the second electromagnetic valve through the hydraulic regulating valve 150. When the first air pressure regulating valve 140 is opened, the first air passage transmits air into the first air cavity. When the second air pressure valve is opened, the second air chamber conveys air to the second air chamber. The gas must also penetrate the oil as it enters the cylinder 121.

The opening degree of the air pressure regulating valve 140 is related to the amount of air taken in the pneumatic cylinder 121. The larger the opening degree of the air pressure adjusting valve 140 is, the larger the amount of intake air in the pneumatic cylinder 121 is. And the intake air amount is related to the pressure applied by the pressing member 130 to the device under test 200 during the pressure test. The larger the intake air amount is, the larger the difference in air pressure between both sides of the air pressure piston is. Then the greater the pressure provided by the pressing member 130 on the test element 200.

Due to the different materials of the dut 200, the pressing force applied by the pressing member 130 to the dut 200 will also be different during the pressure test. Therefore, by providing the air pressure adjusting valve 140, when the material of the device 200 to be tested changes, the controller can control the air intake amount of the pneumatic cylinder 121 by controlling the opening degree of the air pressure adjusting valve 140, so that the pressure applied by the pressing member 130 on the device 200 to be tested can meet the requirement.

In addition, a collecting pipe is provided in the air pressure regulating valve 140. The air supply typically compresses air and delivers it to the air pressure regulating valve 140 via conduit 191. The air contains more water vapor. By arranging the collecting pipe, water vapor can be deposited in the collecting pipe before entering the pneumatic cylinder 121, so that the water vapor is prevented from entering the pneumatic cavity along with the gas to influence the use of the pneumatic cylinder 121.

And hydraulic pressure regulating valve 150's setting, hydraulic pressure regulating valve 150 is the internal lubricating oil that contains, and on the one hand, lubricating oil has the adsorption to steam, and gas is when penetrating lubricating oil, and lubricating oil can be to gas further drying. On the other hand, since the lubricating oil also has a vapor pressure at normal temperature, the gas will carry a part of the lubricating oil vapor into the pneumatic cylinder 121 during the process of penetrating the lubricating oil, and lubricate the piston, so as to prevent the piston from being worn due to the large friction force between the piston and the inner wall of the pneumatic cylinder 121. Generally, the lubricant vapor enters the cylinder 121 and may cover the inner wall of the cylinder 121.

Specifically, the air pressure regulating valve 140 and the hydraulic pressure regulating valve 150 are both mounted on the other mounting bracket 114.

In one embodiment, the pressing member 130 is located above the base 111 and below the pneumatic cylinder 121. The middle part of the pressing member 130 is provided with a fixing hole, and one end of the air pressure piston rod 1211 extending out of the second air cavity is clamped in the fixing hole, so that the installation of the air pressure piston rod 1211 and the pressing member 130 can be realized. In this way, the pressing member 130 and the pneumatic piston rod 1211 can be separated and mounted by external force without using a fastener, and the structure is simple and the assembly is convenient.

In one embodiment, the clearance hole 1113 of the base 111 is aligned with the pneumatic piston rod 1211 and the pressing member 130. If the pressing member 130 is inadvertently dropped from the pneumatic piston rod 1211, the pneumatic piston rod 1211 is just sliding down. The sliding of the pneumatic piston rod 1211 cannot be stopped in time by the inertia, and at this time, the pneumatic piston rod 1211 may slide to abut against the base 111, and may be broken due to the rigid contact between the base 111 and the pneumatic piston rod 1211. The position-avoiding hole 1113 is disposed such that the position-avoiding hole 1113 can avoid the pneumatic piston rod 1211 to prevent the base 111 from contacting the pneumatic piston rod 1211 to damage the pneumatic piston rod 1211.

In one embodiment, the driving member 120 and the pressing member 130 are aligned with the middle of the dut 200, and the clearance hole 1113 is also aligned with the middle of the dut 200. Therefore, the driving member 120 drives the pressing member 130 to slide, and the pressing member 130 can abut against the middle portion of the device under test 200. The pressure provided by the pressing member 130 acts on the middle portion of the dut 200, so that the dut 200 can be prevented from tilting in one direction due to uneven force applied to the two ends. Therefore, the device under test 200 can maintain the stability of installation during the pressure test, thereby having better test reliability.

In one embodiment, the side of the press element 130 facing the pressure test station is recessed to form an abutment channel 131.

The abutment through-groove 131 penetrates the pressing member 130. When the pressing member 130 abuts against the to-be-tested member 200, the to-be-tested member 200 is inserted into the abutting through groove 131, and two opposite ends of the to-be-tested member 200 abut against the mounting grooves 1123 of the two clamping blocks 112 respectively. Through setting up the butt and leading to groove 131, the butt leads to groove 131 and mounting groove 1123 combined action, can follow the top and the below of the piece 200 that awaits measuring and carry on spacingly to the piece 200 that awaits measuring to prevent that the piece 200 that awaits measuring from sliding, be convenient for promote the reliability of test.

Specifically, the groove wall of the abutting through groove 131 is an arc surface, and the inner diameter thereof gradually decreases in the direction from the base 111 to the pressing member 130. The pressing member 130 slides downward until it contacts and abuts the member to be tested 200. And the groove wall of the butt through groove 131 is a circular arc surface, and the inner diameter thereof is gradually reduced along the direction from the base 111 to the pressing member 130, therefore, when the pressing member 130 gradually slides downwards and contacts with the to-be-tested piece 200, the butt through groove 131 has a larger groove opening size, and the to-be-tested piece 200 can conveniently stretch into the butt through groove 131. With the further downward movement of the pressing member 130, the to-be-tested piece 200 and the groove wall of the abutting through groove 131 can be gradually attached tightly, so that the pressing member 130 can fix the to-be-tested piece 200 to the to-be-tested piece 200 and press the to-be-tested piece 200 conveniently. When the pressure test is finished, the arrangement can also facilitate the pressing element 130 to be separated from the element to be tested 200.

Further, in an embodiment, the pressure testing machine 100 further includes an elastic pad disposed on a side surface of the pressing member 130 facing the pressure testing station.

Since the object 200 to be measured may be made of ceramic, if the pressing member 130 slides down too fast, the ceramic may be impacted greatly, and cracks may be generated in the ceramic shovel. The pressing member 130 is provided with an elastic pad on the surface facing the device 200 to be tested, and the elastic pad has a buffering function, so that when the pressing member 130 contacts the device 200 to be tested, the impact force of a part of the pressing member 130 on the device 200 to be tested can be counteracted, and the device 200 to be tested is prevented from being damaged due to the fact that the pressing member 130 impacts the device 200 to be tested.

Specifically, when the elastic pad is disposed on the pressing member 130, the elastic pad is completely accommodated in the abutting through groove 131 and laid on the groove wall of the abutting through groove 131.

When the pressure testing machine 100 performs a pressure test, the device 200 to be tested is placed at a pressure testing station, the pneumatic cylinder 121 is activated, the pneumatic piston rod 1211 pushes the pressing member 130 to slide to the pressure testing station under the driving of air pressure, and the pressing member 130 provides pressure for the device 200 to be tested. The pressure sensor may detect a pressure value provided by the pressing member 130, and when the pressure value is smaller than a preset value, the hydraulic piston rod 1221 is extended and abutted against one end of the pneumatic piston rod 1211, and a force toward the pressing member 130 is applied to the pneumatic piston rod 1211, which is superimposed on the air pressure difference of the pneumatic cylinder 121, so that the force applied to the pneumatic piston rod 1211 increases. The pressing member 130 is mounted on the air cylinder rod 1211, and thus, the pressure provided by the pressing member 130 is also increased. When the pressure value is greater than the predetermined value, the hydraulic piston rod 1221 is retracted to apply a force to the pneumatic piston rod 1211 against the pressing member 130, the force is offset by the difference between the pressures in the pneumatic cylinder 121, so that the force applied to the pneumatic piston rod 1211 is reduced, and the pressure provided by the pressing member 130 is reduced, so that the pressure value is maintained at the predetermined value. Therefore, the pressure testing machine 100 can maintain the pressure value of the pressing member 130 acting on the to-be-tested object 200 at the predetermined value during the process of performing the pressure test on the to-be-tested object 200, thereby having higher testing accuracy.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A pressure testing machine, comprising:

2. The pressure testing machine of claim 1, further comprising a controller electrically connected to the pressure sensor and the hydraulic cylinder.

3. The pressure testing machine according to claim 2, further comprising a hydraulic pressure regulating valve and an air pressure regulating valve electrically connected to the controller, wherein the air pressure regulating valve is communicated with the interior of the pneumatic cylinder through the hydraulic pressure regulating valve, the hydraulic pressure regulating valve contains lubricating oil, and the air passing through the air pressure regulating valve penetrates through the lubricating oil and enters the interior of the pneumatic cylinder.

4. The pressure testing machine of claim 1, wherein a side of the press element facing the pressure testing station is recessed to form an abutting channel.

5. The pressure testing machine of claim 1, further comprising an elastic pad disposed on a side surface of the pressing element facing the pressure testing station.

6. The pressure testing machine of claim 1, wherein the body includes a base and two clamping blocks, the base having a testing surface, the two clamping blocks being spaced apart from the testing surface and defining a pressure testing station with the testing surface.

7. The pressure testing machine as claimed in claim 6, wherein the testing surface has a strip-shaped fixing groove, each of the two clamping blocks includes a clamping block body and a mounting block connected to the clamping block body, the clamping block body is carried on the testing surface, and the mounting block is clamped to the fixing groove.

8. The pressure testing machine of claim 6, wherein the surfaces of the two clamping blocks facing each other are recessed to form mounting slots.

9. The pressure testing machine as set forth in claim 1, further comprising a rail mounted to the machine body and extending in a direction parallel to a line connecting the driving member and the pressing member, and a connecting block through which the driving member is connected to the rail, the driving member being operatively slidable along the direction in which the rail extends.

10. The pressure testing machine of claim 9, further comprising a rotation prevention block and a connecting rod, wherein the pneumatic piston rod is inserted through the rotation prevention block, and the rotation prevention block is connected to the connecting block through the connecting rod.