Piston rod verticality detection device

Abstract

The utility model discloses a piston rod verticality detection device, the piston rod comprises a rod head and a rod body, the rod head is provided with a mounting hole, the piston rod also comprises a positioning column matched with the mounting hole and a reference plate inserted on the positioning column, the reference plate comprises an insertion part inserted on the positioning column and a reference surface matched with the outer wall of the rod body, and the positioning column is provided with a positioning hole. The datum plate further comprises a supporting face connected with the inserting part and the datum plane, and the axis of the positioning column is perpendicular to the datum plane. According to the technical scheme, the piston rod perpendicularity detection device is used for detecting the perpendicularity of the rod head and the rod body of the piston rod, so that the production quality of the piston rod is improved, and the piston rod perpendicularity detection device has the advantages of being low in detection cost and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the field of piston rod processing detection, in particular to a piston rod verticality detection device. Background Art

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion (or oscillating motion). The piston rod is a key component of the hydraulic cylinder. The piston rod consists of a rod body and a rod head mounted on the rod body. Testing the verticality of the rod body and rod head directly impacts the performance of the hydraulic cylinder. Failure to meet the required piston rod verticality can lead to poor cylinder operation, difficulty in installation on the main machine, and a reduced service life. Existing testing devices can only detect whether the piston rod is perpendicular to the ground, but cannot verify the verticality of the piston rod body and rod head, resulting in low piston rod production quality.

[0003] For example, the Chinese patent announcement number CN221077663U, announcement date June 4, 2024, is named "A piston rod verticality detection mechanism", which includes a vertical detection ruler. Two positioning connecting parts are equipped on one side of the vertical detection ruler. Both positioning connecting parts are provided with positioning slots. The two positioning slots are vertically opposite to each other, and the upper side, lower side and side away from the vertical detection ruler of the positioning slot are open. The opening size of the positioning slot gradually increases from the end close to the vertical detection ruler to the end away from the vertical detection ruler, and the horizontal cross-section of the positioning slot is symmetrically arranged along the midline. The vertical detection ruler includes a back plate connected to the two positioning connecting parts, and a rotating rod is fixedly connected to the upper part of the back plate.

[0004] The disadvantage of the existing patent is that the existing detection device cannot detect the verticality of the rod body and the rod head of the piston rod, resulting in the problem of low production quality of the piston rod. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that the existing piston rod detection device cannot detect the verticality of the rod body and the rod head of the piston rod, resulting in low piston rod production quality, and to provide a piston rod verticality detection device that can detect the verticality of the rod body and the rod head of the piston rod and improve the piston rod production quality.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A piston rod verticality detection device is disclosed. The piston rod comprises a rod head and a rod body. The rod head is provided with a mounting hole, a positioning post that engages with the mounting hole, and a reference plate inserted into the positioning post. The reference plate comprises a plug-in portion inserted into the positioning post and a reference surface that engages with the outer wall of the rod body. The reference plate also includes a support surface connecting the plug-in portion and the reference surface. The axis of the positioning post is perpendicular to the reference surface. The piston rod verticality detection device described in this technical solution is used to detect the verticality of the rod head and rod body of the piston rod. During testing, the positioning post is inserted into the mounting hole of the rod head so that the positioning post and the mounting hole of the rod head are coaxial. The reference surface is simultaneously abutted against the outer wall of the rod body. The reference surface is a plane perpendicular to the axis of the positioning post. If the reference surface is in line contact with the outer wall of the piston rod, the verticality of the rod body and rod head meets the requirements and the piston rod meets production quality requirements and is qualified. If the reference surface is in contact with only one end of the piston rod body, the verticality of the rod body and rod head does not meet the requirements. The positioning column is used to locate the mounting hole of the rod head, the reference surface of the reference plate is used to detect the verticality of the rod body and the rod head, and the supporting surface of the reference plate is used to support the reference surface. At the same time, it plays a role in increasing the rigidity of the reference plate, improving the verticality requirements between the positioning column and the reference surface, and improving the accuracy of the piston rod verticality detection.

[0008] This technical solution detects the verticality of the rod head and the rod body of the piston rod, thereby improving the production quality of the piston rod, and has the advantages of low detection cost and convenient operation.

[0009] Preferably, the outer wall of the positioning post is a cylindrical surface, which cooperates with the inner wall of the mounting hole, and the axis of the cylindrical surface is perpendicular to the reference plane. The positioning post is inserted into the mounting hole of the rod head, and the positioning post and the mounting hole are coaxially arranged for positioning, and the verticality of the rod body is then detected by the reference plane.

[0010] Preferably, the outer wall of the positioning post is a conical surface that is smaller on the outside and larger on the inside, and the conical surface is inserted into the mounting hole, with the axis of the conical surface perpendicular to the reference surface. The outer wall of the positioning post is a conical surface that is larger on the outside and smaller on the inside, and the outer end of the positioning post is inserted into the mounting hole, and the inner end is connected to the reference plate. The outer wall of the positioning post is a conical surface, and the cross-section of the end of the positioning post inserted into the mounting surface is smaller than the cross-section of the end of the positioning post connected to the reference plate.

[0011] Preferably, the plug-in portion has a rectangular cross-section, and the positioning post is provided with a rectangular hole that mates with the plug-in portion. The rectangular cross-section of the plug-in portion mates with the rectangular hole in the positioning post, thereby improving the perpendicularity accuracy between the positioning post and the reference plate, while also preventing deflection between the positioning post and the reference plate.

[0012] Preferably, the plug-in portion is secured to the positioning post by a plurality of set screws, each of which is secured on two adjacent sides of the plug-in portion. The axes of some set screws are coaxial or parallel to the axis of the positioning post, while the axes of some set screws are perpendicular to the axis of the positioning post, thereby improving the stability of the plug-in portion.

[0013] Preferably, the reference surface extends along the axis of the rod body, and the length of the reference surface is set according to the length of the piston rod.

[0014] Preferably, a processing plane is provided on the outer wall of the positioning column, and a screw hole that matches the set screw is provided on the processing plane. The processing plane facilitates the processing of the screw hole.

[0015] Preferably, the device further includes an adjustment bolt, the head of which abuts the outer end of the rod head, and the shank of which passes through the rod head and is threadedly connected to the positioning column. During testing, when the positioning column is inserted into the mounting hole of the rod head, the adjustment bolt is inserted into the other end of the mounting hole of the rod head and threadedly connected to the positioning column. The positioning column is provided with an adjustment screw hole that mates with the adjustment bolt. The adjustment screw hole is coaxial with the positioning column, and the adjustment bolt ensures that the positioning column and the mounting hole are coaxially arranged, preventing uncertainty during testing as to whether the positioning column and the mounting hole are coaxially arranged.

[0016] Preferably, the reference surface is perpendicular to the support surface, so that the support surface can better support the reference surface and prevent the reference surface from bending.

[0017] Preferably, the adjusting bolt is coaxially arranged with the positioning column, and the adjusting bolt is coaxially arranged with the mounting hole.

[0018] Therefore, the utility model has the following beneficial effects: the verticality of the rod head and the rod body of the piston rod is detected, thereby improving the production quality of the piston rod, and has the advantages of low detection cost and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the second embodiment of the present utility model.

[0020] Figure 2 This is a partial cross-sectional view of the second embodiment of the present invention.

[0021] Figure 3 This is a cross-sectional view of the positioning post in the second embodiment of the present utility model.

[0022] Figure 4 This is a structural diagram of the second embodiment of the present invention during detection.

[0023] Figure 5This is a structural diagram of the fourth embodiment of the present utility model during detection.

[0024] As shown in the picture:

[0025] Rod head 1, mounting hole 1.1,

[0026] Rod body 2,

[0027] Positioning column 3, rectangular hole 3.1, processing plane 3.2,

[0028] Reference plate 4, plug-in portion 4.1, reference surface 4.2, support surface 4.3,

[0029] Tightening screw 5, adjusting bolt 6. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the technical solution of the present invention clearer, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Embodiment 1, a piston rod verticality detection device, the piston rod includes a rod head 1 and a rod body 2, the rod head 1 is provided with a mounting hole 1.1, including a positioning column 3 that cooperates with the mounting hole 1.1 and a reference plate 4 inserted on the positioning column 3, the reference plate 4 includes a plug-in portion 4.1 inserted on the positioning column 3 and a reference surface 4.2 that cooperates with the outer wall of the rod body 2, the reference plate 4 also includes a supporting surface 4.3 connecting the plug-in portion 4.1 and the reference surface 4.2, and the axis of the positioning column 3 is arranged perpendicular to the reference surface 4.2.

[0032] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion (or oscillating motion). The piston rod is a key component of the hydraulic cylinder. The piston rod comprises a rod body 2 and a rod head 1 mounted on the rod body 2. Testing the rod body 2 and the verticality requirements of the rod body 2 are directly related to the performance of the hydraulic cylinder. Failure to meet the required piston rod verticality can lead to poor hydraulic cylinder operation, difficulty in installation on the main engine, and a reduced service life. Existing detection devices can only detect whether the piston rod is perpendicular to the ground, but cannot detect the verticality of the piston rod body 2 and rod head 1, resulting in low piston rod production quality.

[0033] In order to solve the problem that the existing piston rod detection device cannot detect the verticality of the piston rod body 2 and the rod head 1, resulting in low piston rod production quality, a piston rod verticality detection device is provided for detecting the verticality of the piston rod body 2 and the rod head 1 and improving the piston rod production quality.

[0034] A piston rod verticality detection device in the above embodiment is used to detect the verticality of the rod head 1 and the rod body 2 of the piston rod. During the detection, the positioning column 3 is inserted into the mounting hole 1.1 of the rod head 1 so that the positioning column 3 and the mounting hole 1.1 of the rod head 1 are coaxially arranged, and at the same time, the reference surface 4.2 is abutted against the outer wall of the rod body 2. The reference surface 4.2 is a plane perpendicular to the axis of the positioning column 3. If the reference surface 4.2 is in line contact with the outer wall of the rod body 2 of the piston rod, the verticality of the rod body 2 and the rod head 1 of the piston rod meets the requirements, and the piston rod meets the production quality requirements and is a qualified product; if the reference surface 4.2 is in contact with only one end of the rod body 2 of the piston rod, the verticality of the rod body 2 and the rod head 1 of the piston rod does not meet the requirements. The positioning column 3 is used to locate the mounting hole 1.1 of the rod head 1, the reference surface 4.2 of the reference plate 4 is used to detect the verticality of the rod body 2 and the rod head 1, and the supporting surface 4.3 of the reference plate 4 is used to support the reference surface 4.2, and at the same time plays a role in improving the rigidity of the reference plate 4, improving the verticality requirement between the positioning column 3 and the reference surface 4.2, and improving the accuracy of the piston rod verticality detection.

[0035] This technical solution detects the verticality of the rod head 1 and the rod body 2 of the piston rod, thereby improving the production quality of the piston rod, and has the advantages of low detection cost and convenient operation.

[0036] Further optimizations have been made to the connector 4.1 and the positioning post 3. The connector 4.1 has a rectangular cross-section, and the positioning post 3 is provided with a rectangular hole 3.1 that mates with the connector 4.1. The rectangular cross-section of the connector 4.1, which mates with the rectangular hole 3.1 in the positioning post 3, improves the perpendicularity between the positioning post 3 and the reference plate 4, while also preventing deflection between the positioning post 3 and the reference plate 4.

[0037] Further optimizations have been made to the connector 4.1 and the positioning post 3. Connector 4.1 is secured to the positioning post 3 via several set screws 5, located on two adjacent sides of connector 4.1. The axes of some set screws 5 are coaxial or parallel to the axis of the positioning post 3, while others are perpendicular to it, enhancing the stability of connector 4.1.

[0038] Furthermore, the reference surface 4.2 extends along the axis of the rod body 2. The length of the reference surface 4.2 is set according to the length of the piston rod.

[0039] The positioning column 3 is further optimized, and a processing plane 3.2 is provided on the outer wall of the positioning column 3. The processing plane 3.2 is provided with a screw hole that matches the set screw 5. The processing plane 3.2 facilitates the processing of the screw hole.

[0040] In this technical solution, the reference surface 4.2 is perpendicular to the support surface 4.3, and the support surface 4.3 effectively supports the reference surface 4.2, thereby preventing the reference surface 4.2 from bending.

[0041] Example 2, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 The piston rod verticality detection device shown in the figure comprises a piston rod including a rod head 1 and a rod body 2. The rod head 1 is provided with a mounting hole 1.1, a positioning column 3 cooperating with the mounting hole 1.1 and a reference plate 4 inserted on the positioning column 3. The reference plate 4 comprises a plug-in portion 4.1 inserted on the positioning column 3 and a reference surface 4.2 cooperating with the outer wall of the rod body 2. The reference plate 4 also comprises a supporting surface 4.3 connecting the plug-in portion 4.1 and the reference surface 4.2. The axis of the positioning column 3 is arranged perpendicular to the reference surface 4.2.

[0042] The outer wall of positioning post 3 is a cylindrical surface that mates with the inner wall of mounting hole 1.1, with the axis of the cylindrical surface perpendicular to reference surface 4.2. Positioning post 3 is inserted into mounting hole 1.1 of rod head 1, coaxially arranged with mounting hole 1.1 for positioning, and then the verticality of rod body 2 is checked via reference surface 4.2.

[0043] Further optimize the plug-in portion 4.1 and the positioning column 3, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, the cross-section of the plug portion 4.1 is rectangular, and the positioning post 3 is provided with a rectangular hole 3.1 that mates with the plug portion 4.1. The plug portion 4.1 has a rectangular cross-section and mates with the rectangular hole 3.1 in the positioning post 3, improving the perpendicularity accuracy between the positioning post 3 and the reference plate 4 while also preventing deflection between the positioning post 3 and the reference plate 4.

[0044] Further optimize the plug-in portion 4.1 and the positioning column 3, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, the connector 4.1 is secured to the positioning post 3 via a plurality of set screws 5, which are secured on two adjacent sides of the connector 4.1. The axes of some set screws 5 are coaxial or parallel to the axis of the positioning post 3, while the axes of some set screws 5 are perpendicular to the axis of the positioning post 3, thereby improving the stability of the connector 4.1.

[0045] Furthermore, the reference surface 4.2 extends along the axis of the rod body 2. The length of the reference surface 4.2 is set according to the length of the piston rod.

[0046] Further optimize the positioning column 3, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4As shown, a processing plane 3.2 is provided on the outer wall of the positioning column 3, and a screw hole is provided on the processing plane 3.2 to cooperate with the set screw 5. The processing plane 3.2 facilitates the processing of the screw hole.

[0047] In this technical solution, the reference surface 4.2 is perpendicular to the support surface 4.3, and the support surface 4.3 effectively supports the reference surface 4.2, thereby preventing the reference surface 4.2 from bending.

[0048] The utility model has the following beneficial effects: detecting the verticality of the rod head 1 and the rod body 2 of the piston rod, thereby improving the production quality of the piston rod, and has the advantages of low detection cost and convenient operation.

[0049] Example 3, as Figure 5 The piston rod verticality detection device shown in the figure comprises a piston rod including a rod head 1 and a rod body 2. The rod head 1 is provided with a mounting hole 1.1, a positioning column 3 cooperating with the mounting hole 1.1 and a reference plate 4 inserted on the positioning column 3. The reference plate 4 comprises a plug-in portion 4.1 inserted on the positioning column 3 and a reference surface 4.2 cooperating with the outer wall of the rod body 2. The reference plate 4 also comprises a supporting surface 4.3 connecting the plug-in portion 4.1 and the reference surface 4.2. The axis of the positioning column 3 is arranged perpendicular to the reference surface 4.2.

[0050] The outer wall of positioning column 3 is a conical surface that is smaller on the outside and larger on the inside. This conical surface is inserted into mounting hole 1.1, with its axis perpendicular to reference surface 4.2. The outer end of positioning column 3 is inserted into mounting hole 1.1, while the inner end is connected to reference plate 4. The outer wall of positioning column 3 is a conical surface that is larger on the outside and smaller on the inside. The cross-section of the end of positioning column 3 that inserts into the mounting surface is smaller than the cross-section of the end of positioning column 3 that connects to reference plate 4. An adjustment bolt 6 is coaxial with positioning column 3 and mounting hole 1.1. Positioning column 3 accommodates rod bodies 2 of varying sizes.

[0051] Further optimize the plug-in portion 4.1 and the positioning column 3, such as Figure 5 As shown, the cross-section of the plug portion 4.1 is rectangular, and the positioning post 3 is provided with a rectangular hole 3.1 that mates with the plug portion 4.1. The plug portion 4.1 has a rectangular cross-section and mates with the rectangular hole 3.1 in the positioning post 3, improving the perpendicularity accuracy between the positioning post 3 and the reference plate 4 while also preventing deflection between the positioning post 3 and the reference plate 4.

[0052] Further optimize the plug-in portion 4.1 and the positioning column 3, such as Figure 5As shown, the connector 4.1 is secured to the positioning post 3 via a plurality of set screws 5, which are secured on two adjacent sides of the connector 4.1. The axes of some set screws 5 are coaxial or parallel to the axis of the positioning post 3, while the axes of some set screws 5 are perpendicular to the axis of the positioning post 3, thereby improving the stability of the connector 4.1.

[0053] Furthermore, the reference surface 4.2 extends along the axis of the rod body 2. The length of the reference surface 4.2 is set according to the length of the piston rod.

[0054] Further optimize the positioning column 3, such as Figure 5 As shown, a processing plane 3.2 is provided on the outer wall of the positioning column 3, and a screw hole is provided on the processing plane 3.2 to cooperate with the set screw 5. The processing plane 3.2 facilitates the processing of the screw hole.

[0055] In this technical solution, the reference surface 4.2 is perpendicular to the support surface 4.3, and the support surface 4.3 effectively supports the reference surface 4.2, thereby preventing the reference surface 4.2 from bending.

[0056] The utility model has the following beneficial effects: detecting the verticality of the rod head 1 and the rod body 2 of the piston rod, thereby improving the production quality of the piston rod, and has the advantages of low detection cost and convenient operation.

[0057] Example 4, as Figure 5 The piston rod verticality detection device shown in the figure comprises a rod head 1 and a rod body 2. The rod head 1 is provided with a mounting hole 1.1, a positioning post 3 that cooperates with the mounting hole 1.1, and a reference plate 4 inserted into the positioning post 3. The reference plate 4 comprises a plug-in portion 4.1 inserted into the positioning post 3 and a reference surface 4.2 that cooperates with the outer wall of the rod body 2. The reference plate 4 also comprises a support surface 4.3 connecting the plug-in portion 4.1 and the reference surface 4.2. The axis of the positioning post 3 is arranged perpendicular to the reference surface 4.2. The piston rod also comprises an adjustment bolt 6. The head of the adjustment bolt 6 abuts the outer end of the rod head 1, and the rod portion of the adjustment bolt 6 passes through the rod head 1 and is threadedly connected to the positioning post 3. During testing, when the positioning post 3 is inserted into the mounting hole 1.1 of the rod head 1, the adjustment bolt 6 is inserted into the other end of the mounting hole 1.1 of the rod head 1 and is threadedly connected to the positioning post 3. The positioning post 3 is provided with an adjustment screw hole that cooperates with the adjustment bolt 6. The adjustment screw hole is coaxially arranged with the positioning column 3, and the adjustment bolt 6 ensures that the positioning column 3 is coaxially arranged with the mounting hole 1.1, so as to prevent the inability to determine whether the positioning column 3 is coaxially arranged with the mounting hole 1.1 during detection.

[0058] There are two implementation methods of the positioning column 3: (1) The outer wall of the positioning column 3 is a cylindrical surface, which matches the inner wall of the mounting hole 1.1, and the axis of the cylindrical surface is perpendicular to the reference surface 4.2. The positioning column 3 is inserted into the mounting hole 1.1 of the rod head 1. The positioning column 3 and the mounting hole 1.1 are coaxially arranged for positioning, and then the verticality of the rod body 2 is detected by the reference surface 4.2; (2) The outer wall of the positioning column 3 is a conical surface with a small outer side and a large inner side, which is inserted into the mounting hole 1.1, and the axis of the conical surface is perpendicular to the reference surface 4.2. The outer wall of the positioning column 3 is a conical surface with a large outer side and a small inner side. The outer end of the positioning column 3 is inserted into the mounting hole 1.1, and the inner end is connected to the reference plate 4. The outer wall of the positioning column 3 is a conical surface, and the cross-section of the end of the positioning column 3 inserted into the mounting surface is smaller than the cross-section of the end of the positioning column 3 connected to the reference plate 4. The adjustment bolt 6 is coaxially arranged with the positioning column 3, and the adjustment bolt 6 is coaxially arranged with the mounting hole 1.1. The positioning column 3 is adapted to rod bodies 2 of different sizes and specifications.

[0059] Further optimize the plug-in portion 4.1 and the positioning column 3, such as Figure 5 As shown, the cross-section of the plug portion 4.1 is rectangular, and the positioning post 3 is provided with a rectangular hole 3.1 that mates with the plug portion 4.1. The plug portion 4.1 has a rectangular cross-section and mates with the rectangular hole 3.1 in the positioning post 3, improving the perpendicularity accuracy between the positioning post 3 and the reference plate 4 while also preventing deflection between the positioning post 3 and the reference plate 4.

[0060] Further optimize the plug-in portion 4.1 and the positioning column 3, such as Figure 5 As shown, the connector 4.1 is secured to the positioning post 3 via a plurality of set screws 5, which are secured on two adjacent sides of the connector 4.1. The axes of some set screws 5 are coaxial or parallel to the axis of the positioning post 3, while the axes of some set screws 5 are perpendicular to the axis of the positioning post 3, thereby improving the stability of the connector 4.1.

[0061] Furthermore, the reference surface 4.2 extends along the axis of the rod body 2. The length of the reference surface 4.2 is set according to the length of the piston rod.

[0062] Further optimize the positioning column 3, such as Figure 5 As shown, a processing plane 3.2 is provided on the outer wall of the positioning column 3, and a screw hole is provided on the processing plane 3.2 to cooperate with the set screw 5. The processing plane 3.2 facilitates the processing of the screw hole.

[0063] In this technical solution, the reference surface 4.2 is perpendicular to the support surface 4.3, and the support surface 4.3 effectively supports the reference surface 4.2, thereby preventing the reference surface 4.2 from bending.

[0064] The utility model has the following beneficial effects: detecting the verticality of the rod head 1 and the rod body 2 of the piston rod, thereby improving the production quality of the piston rod, and has the advantages of low detection cost and convenient operation.

[0065] The specific embodiments described above are only preferred implementations of the present invention and are not intended to limit the specific scope of implementation of the present invention. All equivalent changes made to the shape and structure of the present invention should be included in the scope of protection of the present invention.

Claims

1. A piston rod verticality detection device, the piston rod includes a rod head and a rod body, the rod head is provided with a mounting hole, wherein: It includes a positioning column that cooperates with the mounting hole and a reference plate inserted on the positioning column. The reference plate includes a plug-in portion inserted on the positioning column and a reference surface that cooperates with the outer wall of the rod body. The reference plate also includes a supporting surface connecting the plug-in portion and the reference surface. The axis of the positioning column is arranged perpendicular to the reference surface.

2. A piston rod verticality detection device according to claim 1, characterized in that: The outer wall of the positioning column is a cylindrical surface, the cylindrical surface cooperates with the inner wall of the mounting hole, and the axis of the cylindrical surface is perpendicular to the reference plane.

3. The piston rod verticality detection device according to claim 1, characterized in that: The outer wall of the positioning column is a conical surface with a smaller outer side and a larger inner side. The conical surface is inserted into the mounting hole, and the axis of the conical surface is perpendicular to the reference plane.

4. A piston rod verticality detection device according to claim 1, 2 or 3, characterized in that: The cross section of the plug-in portion is rectangular, and the positioning column is provided with a rectangular hole that matches the plug-in portion.

5. The piston rod verticality detection device according to claim 4, characterized in that: The plug-in portion is locked on the positioning column by a plurality of set screws, and the set screws are respectively locked on two adjacent sides of the plug-in portion.

6. A piston rod verticality detection device according to claim 1, 2 or 3, characterized in that: The reference surface extends along the axis direction of the rod body.

7. The piston rod verticality detection device according to claim 5, characterized in that: A processing plane is provided on the outer wall of the positioning column, and a screw hole matched with the set screw is provided on the processing plane.

8. A piston rod verticality detection device according to claim 1, 2 or 3, characterized in that: The utility model also comprises an adjusting bolt, wherein the head of the adjusting bolt abuts against the outer end of the rod head, and the rod portion of the adjusting bolt passes through the rod head and is threadedly connected with the positioning column.

9. A piston rod verticality detection device according to claim 1, 2 or 3, characterized in that: The reference surface is arranged perpendicular to the supporting surface.

10. The piston rod verticality detection device according to claim 8, characterized in that: The adjusting bolt is coaxially arranged with the positioning column, and the adjusting bolt is coaxially arranged with the mounting hole.

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