Force removal detection equipment for piston rod

Abstract

The utility model provides a pull-out force detection device for a piston rod, and belongs to the technical field of machinery. The problem of inconvenient detection is solved. The pull-out force detection equipment for the piston rod comprises a rack, a driving piece fixed on the rack and an ejector rod driven by the driving piece to move up and down, a positioning seat is arranged on the rack and below the ejector rod, the positioning seat is provided with a first receding groove, the first receding groove is arranged in a strip shape in the direction from the front side to the rear side of the rack, and the first receding groove is provided with a second receding groove. The first receding groove penetrates through the top face, the front side face and the bottom face of the positioning base. The device has the advantages of convenient detection and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a device for detecting the force release of a piston rod. Background Art

[0002] As Figure 6 shown is a piston rod 13, which includes a head 13a and a rod portion 13b. The rod portion 13b is in the shape of a long rod. The head 13a has a through-hole. One end of the rod portion 13b is fixedly connected to the inner hole of the head 13a. During production, the head 13a and the rod portion 13b are processed separately first, and then the rod portion 13b and the head 13a are tightly fitted and fixed into one body. However, during actual use, there is a force value that needs to be satisfied between the rod portion 13b and the head 13a, that is, it is required that the rod portion 13b and the head 13a do not become loose when the force is lower than or equal to this value. Therefore, it is necessary to detect the force release between the rod portion 13b and the head 13a of the piston rod 13.

[0003] Regarding the detection of this kind of force release, Chinese patents have also disclosed a butt-welding bolt pressing-off pressure detection tooling with a patent application number of 201922499014.3 and an automotive water pump component connection pulling-off force tester with a patent application number of 202021623469.8, etc. They all test by pressing down on the workpiece after the workpiece is installed on the fixture. In these existing detection devices, the workpieces are installed in a way from top to bottom. However, the rod portion 13a of the piston rod 13 is in the shape of a long rod. To complete the installation of the piston rod 13 on the detection device, the part that needs to be pressed down first needs to rise to a very high position, so a lot of longitudinal space is required. Moreover, due to the length of the rod portion 13a, the staff also needs to stand on a high place for installation during installation. Therefore, there is a problem of inconvenient detection in practice. Summary of the Utility Model

[0004] The purpose of the present utility model is to solve the above-mentioned problems existing in the prior art, and propose a device for detecting the force release of a piston rod, which solves the problem of inconvenient detection.

[0005] The purpose of the present utility model can be achieved by the following technical solutions:

[0006] A device for detecting the force release of a piston rod includes a frame, a driving member fixed on the frame, and a top rod that can move up and down under the drive of the driving member. It is characterized in that a positioning seat is provided below the top rod on the frame. The positioning seat has a first relief groove, and the first relief groove is arranged in a strip shape along the front-to-back direction of the frame and penetrates the top surface, front side surface and bottom surface of the positioning seat.

[0007] In use, the driving member controls the ejector rod to be in a high position. The piston rod to be detected is directly installed from the front side with the bottom surface of its head higher than the top surface of the positioning seat. The first relief groove provides clearance for the length of the rod portion until the head of the piston rod to be detected is above the top surface of the positioning seat, and then the head of the piston rod is abutted against the top surface of the positioning seat. After the head of the piston rod abuts, the outer side of the rod portion of the piston rod will abut against the bottom wall of the first relief groove. In this state, the piston rod is directly below the ejector rod. In practice, the width of the first relief groove is exactly adapted to the outer diameter of the rod portion of the piston rod, which can ensure that the piston rod will not tilt and ensure the detection accuracy. Then, the driving member controls the ejector rod to move downward. The ejector rod will insert into the head of the piston rod and come into contact with the top surface of the rod portion of the piston rod. With the continuous driving of the driving member, the ejector rod will generate a downward thrust on the rod portion of the piston rod. In actual use, there is a standard force value that needs to be met between the head and the rod portion of the piston rod (i.e., it is required that the head and the rod portion of the piston rod will not become separated under the action of a force lower than or equal to this standard force value). Therefore, in actual detection, it is necessary to ensure that the thrust applied by the ejector rod to the rod portion of the piston rod is the same as this standard force value. If the head and the rod portion of the piston rod do not become separated after a certain period of time, it is determined that the piston rod meets the usage requirements and is a qualified product.

[0008] This device for detecting the separation force of a piston rod is provided with a positioning seat below the ejector rod on the frame. A first relief groove is provided on the positioning seat, and the first relief groove penetrates through the top surface, front side surface, and bottom surface of the positioning seat, enabling the piston rod to be directly installed from the front side (i.e., the front surface) of the frame. That is, the piston rod is no longer installed from top to bottom as in the traditional way. In this way, it is neither necessary for the staff to stand at a high position to install the piston rod, nor is it necessary for the ejector rod to rise to a very high position before installation, thus greatly improving the detection convenience of the piston rod.

[0009] In the above device for detecting the separation force of a piston rod, a downwardly recessed positioning groove is provided on the top surface of the positioning seat. The positioning groove is circular and communicates with the first relief groove. The inner diameter of the positioning groove is larger than the width of the first relief groove, and the positioning groove is directly below the ejector rod.

[0010] A downwardly recessed positioning groove that communicates with the first relief groove is provided on the top surface of the positioning seat. The positioning groove is circular, so that the piston rod can be stably positioned by inserting the lower end of the head of the piston rod into the positioning groove, ensuring that the piston rod will not shift during the detection process and affect the detection accuracy.

[0011] In the above device for detecting the separation force of a piston rod, the bottom wall of the first relief groove is an arc surface, and the bottom wall of the first relief groove is concentric with the inner wall of the positioning groove.

[0012] The bottom wall of the first relief groove is an arc surface, and the inner wall of the bottom wall of the first relief groove is concentric with the inner wall of the positioning groove. That is to say, when the lower end of the head of the piston rod is located in the positioning groove, the outer side wall of the rod part is in contact with the first relief groove, which further improves the positioning effect of the piston rod.

[0013] In the above-mentioned device for detecting the release force of the piston rod, the frame includes columns and a mounting seat fixed to the top of the columns. The mounting seat is in a frame shape and includes a top plate, a bottom plate, a left side plate, and a right side plate. The driving member is fixed on the top plate, and the positioning seat is fixedly connected to the bottom plate. The bottom plate has a second relief groove, which is arranged in a strip shape along the front-to-back direction and penetrates the top surface, the front side surface, and the bottom surface of the bottom plate. The second relief groove is located below the first relief groove.

[0014] The top plate provides a mounting position for the driving member, and the bottom plate provides a mounting position for the driving member. Since the entire mounting seat is in a frame shape, it enables the staff to directly view the detection process from the front side. Through the setting of the second relief groove, it can provide space for the rod part of the piston rod, avoiding interference of the front side surface of the bottom plate with the direct installation of the piston rod from the front side, and ensuring the convenience of installing the piston rod on the frame.

[0015] In the above-mentioned device for detecting the release force of the piston rod, the column includes a rectangular main body and a chassis fixed to the bottom of the main body. The main body has a notch penetrating its top surface and front side surface, and the notch is located below the second relief groove.

[0016] Through the setting of the notch, it can provide space for the rod part of the piston rod, avoiding interference of the column with the direct installation of the piston rod from the front side, and ensuring the convenience of installing the piston rod on the frame.

[0017] In the above-mentioned device for detecting the release force of the piston rod, the positioning seat is in a block shape, and the positioning seat is fixedly connected to the bottom plate by screws. Two limit blocks are also fixedly connected to the bottom plate. One limit block abuts between the positioning seat and the left side plate, and the other limit block abuts between the positioning seat and the right side plate.

[0018] Both the first relief groove and the positioning groove are provided on the positioning seat, and the positioning seat is connected to the bottom plate by screws. That is to say, it is possible to adapt to the detection of the release force of piston rods of different specifications by replacing the positioning seat with different sizes of the first relief groove and the positioning groove. At the same time, two limit blocks are fixedly connected to the bottom plate. One limit block abuts between the positioning seat and the left side plate, and the other limit block abuts between the positioning seat and the right side plate, which can eliminate the possible left-right movement of the positioning seat and ensure the detection accuracy.

[0019] In the above-mentioned device for detecting the release force of a piston rod, the driving member is an acting cylinder. A pressure sensor is connected between the piston rod of the acting cylinder and the ejector rod. A pressure display electrically connected to the pressure sensor is also fixed on the frame.

[0020] Compared with the prior art, in this device for detecting the release force, a positioning seat is arranged below the ejector rod on the frame. A first relief groove is arranged on the positioning seat, and the first relief groove penetrates through the top surface, front side surface and bottom surface of the positioning seat, so that the piston rod can be directly installed from the front side (i.e., the front surface) of the frame. That is, the piston rod is no longer installed from top to bottom as in the traditional way. In this way, it is neither necessary for the staff to stand at a high place to install the piston rod, nor is it necessary for the ejector rod to rise to a very high position before installation, thus greatly improving the convenience of detecting the piston rod. Brief Description of the Drawings

[0021] Figure 1 is a three-dimensional schematic diagram of the device for detecting the release force of the piston rod.

[0022] Figure 2 is Figure 1 an enlarged view of the positioning seat in

[0023] Figure 3 is a three-dimensional schematic diagram of the positioning seat.

[0024] Figure 4 is a three-dimensional schematic diagram after the piston rod is positioned on the frame.

[0025] Figure 5 is Figure 4 an enlarged view of the positioning seat in

[0026] Figure 6 is a cross-sectional view of the piston rod.

[0027] In the figure, 1. frame; 2. driving member; 3. pressure sensor; 4. ejector rod; 5. positioning seat; 5a. first relief groove; 5a1. bottom wall of the groove; 5b. positioning notch; 6. pressure display; 7. electric control box; 8. upper connecting sleeve; 9. lower connecting sleeve; 10. frame body; 10a. top plate; 10b. bottom plate; 10b1. second relief groove; 10c. left side plate; 10d. right side plate; 11. column; 11a. main body; 11a1. notch; 11b. chassis; 12. limit block; 13. piston rod; 13a. head; 13b. rod part. Detailed Description of the Preferred Embodiments

[0028] The following are specific embodiments of the present invention in combination with the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0029] As Figure 1 , Figure 2 andFigure 3 As shown in the figure, a device for detecting the release of force of a piston rod includes a frame 1, a driving member 2 fixed on the frame 1, and a push rod 4 that can move up and down under the drive of the driving member 2. Among them, the driving member 2 is an acting cylinder, and a pressure sensor 3 is connected between the piston rod of the acting cylinder and the push rod 4. A positioning seat 5 is provided below the push rod 4 on the frame 1. A pressure display 6 and an electric control box 7 are also fixed on the frame 1. In this embodiment, the pressure sensor 3 specifically adopts a double-screw tension and compression sensor with the existing model HZC-B01-500KG. The piston of the acting cylinder is connected to the upper screw of the pressure sensor 3 through an upper connecting sleeve 8, and the lower screw of the pressure sensor 3 is connected to the push rod 4 through a lower connecting sleeve 9. The positioning seat 5 has a first relief groove 5a, and the first relief groove 5a is arranged in a strip shape along the front side to the rear side direction of the frame 1, and the first relief groove 5a penetrates the top surface, front side surface and bottom surface of the positioning seat 5. The top surface of the positioning seat 5 is provided with a downwardly recessed positioning groove 5b. The positioning groove 5b is circular and communicates with the first relief groove 5a. The inner diameter of the positioning groove 5b is larger than the groove width of the first relief groove 5a. The positioning groove 5b is located directly below the push rod 4, and the inner wall of the positioning groove 5b is concentric with the push rod 4. Specifically, the bottom wall 5a1 of the first relief groove 5a is an arc surface, and the bottom wall of the first relief groove 5a is concentric with the inner wall of the positioning groove 5b.

[0030] Furthermore, as Figure 1 and Figure 2 shown in the figure, the frame 1 includes columns 11 and a mounting seat 10 fixedly connected to the top of the columns 11. The mounting seat 10 is in a frame shape and includes a top plate 10a, a bottom plate 10b, a left side plate 10c and a right side plate 10d. The cylinder body of the acting cylinder is fixed on the top surface of the top plate 10a, and the piston of the acting cylinder passes through the top plate 10a. The positioning seat 5 is fixedly connected to the top surface of the bottom plate 10b. The pressure display 6 is fixed on the top surface of the top plate 10a, and the electric control box 7 is fixed on the right side surface of the right side plate 10d. The bottom plate 10b has a second relief groove 10b1, and the second relief groove 10b1 is arranged in a strip shape along the front side to the rear side direction, and the second relief groove 10b1 penetrates the top surface, front side surface and bottom surface of the bottom plate 10b, and the second relief groove 10b1 is located below the first relief groove 5a. The positioning seat 5 is in a block shape, and the positioning seat 5 is fixedly connected to the bottom plate 10b by screws. Two limit blocks 12 are also fixedly connected to the bottom plate 10b. One of the limit blocks 12 abuts between the positioning seat 5 and the left side plate 10c, and the other limit block 12 abuts between the positioning seat 5 and the right side plate 10d. In this embodiment, the column 11 includes a rectangular main body 11a and a chassis 11b fixedly connected to the bottom of the main body 11a. The main body 11a has a notch 11a1 that penetrates its top surface and front side surface, and the notch 11a1 is located below the second relief groove 10b1.

[0031] In use, the piston of the acting cylinder is in a retracted state. The piston rod 13 to be detected is installed from the front side of the frame 1 with the bottom surface of the head 13a higher than the top surface of the positioning seat 5. The first relief groove 5a, the second relief groove 10b1 and the notch 11a1 provide clearance for the entire length of the rod portion 13b until the head 13a of the piston rod 13 to be detected is located above the positioning groove 5b, and then the head 13a of the piston rod 13 is abutted against the positioning groove 5b. After the head 13a of the piston rod 13 abuts against the positioning groove 5b, the outer side of the rod portion 13b of the piston rod 13 will abut against the bottom wall of the first relief groove 5a, thereby providing good positioning for the piston rod 13. In this state, the piston rod 13 is directly below the ejector rod 4. The state of the piston rod 13 after being positioned on the frame 1 is as shown in Figure 4 and Figure 5 shown.

[0032] Then, air is supplied to the acting cylinder to push the piston of the acting cylinder downward. The ejector rod 4 will insert into the head 13a of the piston rod 13 and come into contact with the top surface of the rod portion 13b of the piston rod 13. With continuous air supply to the acting cylinder, a downward thrust will be generated on the rod portion 13b of the piston rod 13 by the ejector rod 4, and at the same time, the pressure sensor 3 will detect the thrust exerted by the ejector rod 4 on the piston rod 13. In actual use, there is a standard force value that needs to be satisfied between the head 13a and the rod portion 13b of the piston rod 13 (that is, it is required that the head 13a and the rod portion 13b of the piston rod 13 shall not become separated under the action of a force lower than or equal to this standard force value). Therefore, when the pressure sensor 3 detects that the force applied to the rod portion 13b of the piston rod 13 has reached the same value as this standard force value during the detection, the air source supplying air to the acting cylinder is controlled to maintain this air pressure to keep the thrust of the ejector rod 4 unchanged. If the head 13a and the rod portion 13b of the piston rod 13 do not become separated after a certain period of time, it is determined that the piston rod 13 meets the usage requirements and is a qualified product.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A device for detecting a piston rod from falling out, comprising a frame (1), a driving member (2) fixed to the frame (1), and a push rod (4) driven by the driving member (2) to move up and down, characterized in that: The frame (1) is provided with a positioning seat (5) below the top rod (4), and the positioning seat (5) has a clearance groove (5a). The clearance groove (5a) is arranged in a strip shape from the front side to the rear side of the frame (1), and the clearance groove (5a) passes through the top surface, front side surface and bottom surface of the positioning seat (5).

2. A piston rod force-off detection device according to claim 1, characterized in that: The top surface of the positioning seat (5) is provided with a positioning groove (5b) which is concave downwards. The positioning groove (5b) is circular and communicates with the first clearance groove (5a). The inner diameter of the positioning groove (5b) is larger than the groove width of the first clearance groove (5a). The positioning groove (5b) is located directly below the top rod (4).

3. A piston rod force-off detection device according to claim 2, characterized in that: The groove bottom wall (5a1) of the clearance groove 1 (5a) is an arc surface, and the groove bottom wall of the clearance groove 1 (5a) is concentrically arranged with the inner wall of the positioning groove (5b).

4. A piston rod force-off detection device according to claim 1, 2 or 3, characterized in that: The frame (1) comprises a column (11) and a mounting seat (10) fixedly connected to the top of the column (11); the mounting seat (10) is frame-shaped and comprises a top plate (10a), a bottom plate (10b), a left plate (10c) and a right plate (10d); the driving member (2) is fixed on the top plate (10a); the positioning seat (5) is fixedly connected to the bottom plate (10b); the bottom plate (10b) has a second clearance groove (10b1); the second clearance groove (10b1) is arranged in a strip shape from the front side to the rear side; the second clearance groove (10b1) passes through the top surface, the front side surface and the bottom surface of the bottom plate (10b); the second clearance groove (10b1) is located below the first clearance groove (5a).

5. A piston rod force-off detection device according to claim 4, characterized in that: The column (11) comprises a rectangular main body (11a) and a bottom plate (11b) fixedly connected to the bottom of the main body (11a). The main body (11a) has a notch (11a1) penetrating its top surface and front side surface. The notch (11a1) is located below the second clearance groove (10b1).

6. A piston rod force-off detection device according to claim 4, characterized in that: The positioning seat (5) is block-shaped and is fixedly connected to the bottom plate (10b) by screws. Two limit blocks (12) are also fixedly connected to the bottom plate (10b), one of which is abutted between the positioning seat (5) and the left side plate (10c), and the other limit block (12) is abutted between the positioning seat (5) and the right side plate (10d).

7. A piston rod force-off detection device according to claim 4, characterized in that: The driving member (2) is an operating cylinder, a pressure sensor (3) is connected between the piston rod of the operating cylinder and the push rod (4), and a pressure display (6) electrically connected to the pressure sensor (3) is also fixed on the frame (1).

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