CN215766831U

CN215766831U - Quick detection device for valve

Info

Publication number: CN215766831U
Application number: CN202121744678.2U
Authority: CN
Inventors: 张凯; 王腾; 董兵; 曲文强; 王刚; 葛邦为; 宋加浩; 孙志刚
Original assignee: JINAN WORLDWIDE AUTO-ACCESSORY Ltd
Current assignee: JINAN WORLDWIDE AUTO-ACCESSORY Ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2022-02-08
Anticipated expiration: 2031-07-29

Abstract

The utility model discloses a rapid detection device for an air valve, which comprises a vertically arranged back plate for limiting the end surface of an air valve disc, a horizontally arranged base and two measuring devices, wherein the two measuring devices are arranged on the base through connecting pieces; through setting up two adjustable gap sizes and adjustable survey device with the backplate distance, can survey the size that detects the same valve's different positions to and the size of the valve of not equidimension type, application range greatly increased, the device adjustment with easy operation, low cost and small, convenient to carry can realize the rapid detection of the valve of different grade type on manufacturing line.

Description

Quick detection device for valve

Technical Field

The utility model belongs to the technical field of valve detection equipment, and particularly relates to a quick valve detection device.

Background

In an automobile engine, an air inlet and exhaust valve is a component which is composed of a disc and a rod part which is coaxially arranged with the disc into a whole, and the air inlet and exhaust valve mainly acts on the exchange process of the air inlet and exhaust of the engine and the like through the opening and closing and sealing of the air valve, and belongs to one of key parts of the automobile engine. The engine valve belongs to a precision machining part, if the machined valve size cannot meet the upper and lower limit requirements of the size of a customer, the valve is adversely affected in assembly and use of the engine, and therefore the valve size must be guaranteed to meet the tolerance range required by the customer in the detection process. Wherein, the diameter of the valve rod, the diameter of the neck and the diameter of the excircle of the disc are the essential detection sizes in the valve detection process.

The variety of the valve on the existing market is numerous, the detection size of a plurality of detection positions of each type of valve is also inequality, in order to solve this problem, generally use dedicated valve precision inspection equipment to accomplish the different grade type, the detection of the valve size of different positions department, but precision inspection equipment not only adjusts and operates complicacy, equipment is bulky, equipment purchase cost is high, and when detecting the valve, because precision inspection equipment is not convenient for remove, need transport the valve of different grade type to precision inspection equipment region, thereby can't realize the rapid detection of the valve of different grade type on manufacturing line.

SUMMERY OF THE UTILITY MODEL

In view of the defects in the prior art, the utility model aims to provide a rapid valve detection device which can detect a plurality of different sizes of different types of valves and solve the problems that the precise valve detection equipment is complex to adjust and operate, large in equipment size, high in equipment purchase cost and incapable of realizing rapid detection of the different types of valves on a manufacturing production line.

In order to solve the technical problem, the utility model adopts the following technical scheme: the utility model provides a swift detection device of valve, includes the vertical backplate, the base that the level was placed, two survey devices that are used for spacing valve disc terminal surface that place, two survey devices pass through the connecting piece setting on the base, the base link to each other with the backplate through the adjustment connecting portion that can adjust its relative distance between and the backplate.

As a further improvement of the utility model, the left and right edges of the two measuring devices are aligned, one is arranged above the other, each measuring device comprises a fixed measuring sheet, an adjusting measuring sheet and an adjusting part, the fixed measuring sheet and the adjusting measuring sheet are both arranged in parallel with the back plate, the two connecting pieces are provided, the fixed measuring sheet is fixed on one of the connecting pieces, the adjusting measuring sheet is connected with the adjusting part which can adjust the fixed measuring sheet to be close to or far from the fixed measuring sheet, the adjusting part is fixed on the other connecting piece, and a gap is formed between the end part of the fixed measuring sheet and the end part of the adjusting measuring sheet.

As a further improvement of the utility model, the connecting piece is a height-adjustable connection.

As a further improvement of the utility model, each height-adjustable connecting piece comprises a first screw rod, a plurality of first nuts and two positioning plates, the first screw rod is vertically arranged on the base, the two positioning plates are sleeved on the first screw rod in parallel, the upper plane and the lower plane of each positioning plate are adjusted and fixed through the first nuts screwed on the first screw rod, one ends of the positioning plates, far away from the back plate, are connected with the measuring device, and positioning hole grooves for avoiding interference with the positioning plates are formed in the positions, corresponding to the positioning plates, on the back plate.

As a further improvement of the utility model, the positioning plate is a rectangular plate, the positioning hole groove is vertically rectangular, the length of the positioning plate in the vertical direction is greater than the length of the adjusting area of the positioning plate in the height direction, the positioning plate is matched with the width of the positioning plate in the width direction, and the length of the part, which exceeds the edge of the base, of one end of the positioning plate close to the back plate is greater than the adjustable maximum distance between the back plate and the base.

As a further improvement of the utility model, the measuring device also comprises a connecting rod, one end of the fixed measuring sheet far away from the adjusting measuring sheet is fixed on the connecting rod, and the positioning plate is fixedly connected to one side of the circumferential surface of the connecting rod.

As a further improvement of the utility model, the adjusting connecting part comprises a second screw rod and a second nut, one end of the second screw rod is fixedly arranged in the center of one side face of the base close to the back plate, the other end of the second screw rod penetrates through the bottom of the back plate, and the two nuts are screwed on the second screw rod on the front side face and the rear side face of the back plate.

As a further improvement of the utility model, the adjusting and connecting part also comprises two guide rods, the two guide rods are arranged and fixed on the base and positioned at two sides of the screw rod II, the positions of the back plate corresponding to the guide rods are respectively provided with a rod hole, and the other ends of the guide rods penetrate through the rod holes on the back plate.

As a further improvement of the utility model, a plurality of supporting blocks are arranged at one side of the bottom of the back plate far away from the base, and the bottom surfaces of the supporting blocks, the bottom surface of the back plate and the bottom surface of the base are on the same plane.

In summary, the utility model has the following beneficial technical effects:

1. through setting up two survey devices, can survey the size that detects the different positions of same valve to and the size of the valve of equidimension type not, application range greatly increased, the device adjustment and easy operation, low cost and small, convenient to carry can realize the rapid detection of the valve of different grade type on manufacturing line.

2. Through setting up fixed measuring piece and regulation measuring piece, according to the dimensional tolerance requirement, set up the size of the space between fixed measuring piece and the regulation measuring piece, observe the valve and wait to detect the position and can pass the space to this judges whether valve size satisfies the tolerance requirement, and operation and detection method are simple.

3. The connecting piece is set to be the height-adjustable connecting piece, so that the two measuring devices can be adjusted in the height direction, and in the actual use process, the two measuring devices can be adjusted to be in a proper height range according to the conditions of use and the size of the air valve, so that the use range and the use comfort are expanded; the connecting piece adopts a screw type adjustable structure, and has simple structure and convenient operation.

4. Set up the locating hole groove that width and locating plate match on the backplate to the one end that the locating plate is close to the backplate exceeds the adjustable maximum distance between backplate and the base of the partial length of base edge, makes at the in-process of backplate adjustment, and the locating plate is pressed from both sides always in the locating hole groove, avoids screw rod one to control the slope, thereby provides more accurate location for survey device, avoids the dimensional error who detects too big.

5. The adjustable connecting part is of an adjustable structure in a screw rod mode, and the use, the operation and the manufacture are simple.

6. Set up the guide bar with screw rod two syntropies between backplate and base, provide the direction for the adjustment of backplate, avoid the backplate at the in-process of adjustment, take place to deflect to influence the tip location of spiracle, lead to detecting the size inaccurate.

7. The supporting block is arranged at the bottom of the back plate to provide bottom support for the back plate, so that the back plate is stably placed on a horizontal plane, and the back plate is prevented from being inclined.

Drawings

The utility model is further described with reference to the accompanying drawings in which:

FIG. 1 is a first perspective view of the present invention;

FIG. 2 is a schematic perspective view of the present invention;

FIG. 3 is a schematic plan view of the present invention;

in the figure: the device comprises a back plate 1, a base 2, a connecting piece 3, a first screw rod 31, a first nut 32, a positioning plate 33, a 4-adjustment connecting part, a second screw rod 41, a second nut 42, a guide rod 43, a 5-measuring device, a fixed measuring piece 51, a 52-adjustment measuring piece 53, an adjusting part 531, a digital display screen, a 532 micro-cylinder 533 ratchet wheel, a 534-micro screw rod, a 535 frame, a 54-connecting rod, a 6-positioning hole groove, a 7-supporting block, 8 gaps and 9 valves.

Detailed Description

The present invention is described in further detail below with reference to figures 1-3.

The embodiment of the utility model discloses a valve shortcut detection device. Referring to fig. 1-3, a swift detection device of valve, including the backplate 1 that is used for spacing valve 9 disc terminal surface of vertical placement, the base 2 of horizontal placement, two survey devices 5 that can survey detection numerical value, two survey devices 5 pass through connecting piece 3 and set up on base 2, base 2 link to each other with backplate 1 through the adjustment connecting portion 4 that can adjust its relative distance with backplate 1.

Specifically, the left edge and the right edge of each measuring device 5 are aligned, one is arranged above the other, the principle of each measuring device is the same as the structural principle of a digital display micrometer, each measuring device 5 comprises a fixed measuring sheet 51, an adjustable measuring sheet 52 and an adjusting part 53, the fixed measuring sheet 51 and the adjustable measuring sheet 52 are arranged in parallel with the back plate 1 and are aligned up and down and back and forth, the two connecting pieces 3 are provided, the fixed measuring sheets 51 are fixed on one connecting piece 3, the adjustable measuring sheets 52 are connected with the adjusting parts 53 capable of adjusting the fixed measuring sheets to be close to or far away from the fixed measuring sheets 51, the adjusting parts 53 are fixed on the other connecting piece 3, a gap 8 is formed between the end parts of the fixed measuring sheets 51 and the end parts of the adjustable measuring sheets 52, and the minimum value of the gap 8 is zero. By arranging the fixed measuring sheet 51 and the adjustable measuring sheet 52, the size of the gap 8 between the fixed measuring sheet 51 and the adjustable measuring sheet 52 is set according to the requirement of dimensional tolerance, and whether the position to be detected of the valve 9 can pass through the gap 8 is observed, so that whether the size of the valve 9 meets the requirement of the tolerance is judged, and the operation and detection method are simple.

In this embodiment, the adjusting portion 53 connected to the adjusting and measuring piece 52 is the same as the adjusting structure of the digital display micrometer, that is, the principle and structure of the digital display micrometer for adjusting the micrometer screw are utilized, and the adjusting portion includes a digital display screen 531, a micro-cylinder 532, a ratchet 533, a micrometer screw 534, and a holder 535, and its internal structure is the same as the adjusting structure of the digital display micrometer, and the drawing does not indicate the internal structure, and when the adjusting portion 53 is manufactured, the digital display micrometer in the prior art can be purchased, then the side anvil and the micrometer bow of the digital display micrometer are removed, and the remaining portion is the adjusting portion 53 in this embodiment, actually, the fixing and measuring piece 52 in this embodiment is equivalent to the side anvil of the digital display micrometer, and only the micrometer bow of the digital display micrometer is replaced by the connecting piece 3, so that the fixing and measuring piece 52 (side anvil) is fixed by the connecting piece 3. Then the end of the micrometer screw 534 is connected with the adjusting measuring sheet 52, one side of the sleeve frame 535 is provided with a digital display screen 531, and the other side is fixed on the connecting piece 3. The adjusting measuring piece 52 is provided in this embodiment to correspond to the fixed measuring piece 51, or the micrometer screw 534 and the fixed measuring piece 52 may be directly caused to correspond to form a micrometer caliper gap without using the adjusting measuring piece 52. The micrometer screw 534 can be driven to move forwards or backwards by rotating the micro-cylinder 532, namely the coarse adjustment knob, so that coarse adjustment of the micrometer screw 534 is completed, the micrometer screw 534 can be driven to move by rotating the ratchet wheel 533, namely the fine adjustment knob, so that fine adjustment of the micrometer screw 534 is completed, the coarse adjustment and the fine adjustment are matched for use, and the adjustment precision is high. In fact, the detailed use principle is the same as that of the digital display micrometer, and is also introduced in the specific operation steps of the working process set forth in the following of the specification.

In addition, the connecting piece 3 is connected in a height-adjustable manner, the connecting piece 3 is of a height-adjustable structure, so that the two measuring devices 5 are adjustable in the height direction, in the process of actual use, the two measuring devices 5 can be adjusted to a proper height range according to the conditions of use and the size of the air valve 9, the use range and the use comfort are expanded, specifically, each height-adjustable connecting piece 3 comprises a screw rod one 31, a plurality of nuts one 32 and two positioning plates 33, the screw rod one 31 is vertically arranged on the base 2, the two positioning plates 33 are parallelly sleeved on the screw rod one 31, the upper plane and the lower plane of each positioning plate 33 are adjusted and fixed through the nuts one 32 screwed on the screw rod one 31, namely the screw rod one 31 is respectively screwed with one nut one 32 on the upper side and the lower side of each positioning plate 33, and one end of each positioning plate 33, which is far away from the back plate 1, is connected with the measuring devices 5, the back plate 1 is provided with a positioning hole groove 6 at a position corresponding to the positioning plate 33 to avoid interference with the positioning plate 33. The connecting piece 3 adopts a screw type adjustable structure, and has simple structure and convenient operation.

In order to avoid the first screw 31 from tilting left and right, so as to provide more accurate positioning for the measuring device 5, and avoid the size error of detection from being too large, the positioning plate 33 is positioned in this embodiment, specifically, the positioning plate 33 is a rectangular plate, the positioning hole slot 6 is vertically rectangular, the length in the vertical direction is greater than the length of the adjustment area of the positioning plate 33 in the height direction, and is matched with the width of the positioning plate 33 in the width direction, and the length of the end of the positioning plate 33 close to the back plate 1, which exceeds the edge of the base 2, is greater than the adjustable maximum distance between the back plate 1 and the base 2, so that the positioning plate 33 is always clamped in the positioning hole slot 6 during the adjustment of the back plate 1, thereby ensuring that the measuring device 5 connected with the positioning plate 33 is in the correct position without shaking.

In addition, the measuring device 5 further comprises a connecting rod 54, one end of the fixed measuring piece 51, which is far away from the adjusting measuring piece 52, is fixed on the connecting rod 54, the positioning plate 33 is fixedly connected to one side of the circumferential surface of the connecting rod 54, and a cylindrical connecting rod 54 with one end is arranged between the positioning plate 33 and the measuring piece, so that the cylindrical connecting rod 54 can correspond to the side micro-screw rod, and the appearance harmony of the device is improved.

In this embodiment, the adjusting and connecting portion 4 between the back plate 1 and the base 2 specifically includes a second screw rod 41 and a second nut 42, one end of the second screw rod 41 is fixedly disposed at the center of a side surface of the base 2 close to the back plate 1, the other end of the second screw rod 41 penetrates through the bottom of the back plate 1, and two second nuts 42 are screwed on the second screw rods 41 at the front and rear sides of the back plate 1. The adjusting connecting part 4 is of a screw-type adjustable structure, and is simple to use, operate and manufacture.

In addition, in the process of adjusting the back plate 1, that is, in the process of adjusting the distance between the back plate 1 and the base 2 by screwing the second nut 42, the back plate 1 may deflect, which results in inaccurate positioning of the air valve 9, thereby affecting the detection result, so the guide rod 43 is further disposed between the back plate 1 and the base 2, that is, the adjusting connection portion 4 further includes two guide rods 43, specifically, two guide rods 43 are disposed and fixed on the base 2 and located at two sides of the second screw 41, a rod hole is respectively formed in the back plate 1 at a position corresponding to the guide rods 43, the other end of each guide rod 43 passes through the rod hole in the back plate 1, and in the process of adjusting and moving the back plate 1, guidance is provided for the back plate 1.

In addition, one side of the bottom of the back plate 1, which is far away from the base 2, is provided with a plurality of supporting blocks 7, the bottom surfaces of the supporting blocks 7, the bottom surface of the back plate 1 and the bottom surface of the base 2 are on the same plane, and the supporting blocks 7 provide bottom support for the back plate 1, so that the back plate 1 is stably placed on a horizontal plane, and the back plate 1 is prevented from inclining.

The working process of the utility model is explained in detail below, and the specific operation steps are as follows:

the method comprises the following steps: when in use, the position of the back plate 1 is adjusted according to the detection position of the detected air valve 9, and the disc end surface of the detected air valve 9 is in contact positioning with the back plate 1; the second nut 42 is screwed, the position of the back plate 1 is adjusted in a sliding mode back and forth, the measured position of the measured valve 9 is in contact with the fixed measuring sheet 51 or the adjusting measuring sheet 52, and the consistency of the detected measuring position and the requirement of a customer is guaranteed; after the position of the back plate 1 is adjusted, two nuts two 42 at two sides of the back plate 1 are fastened respectively to lock and fix the position of the back plate 1.

Step two: moving the air valve 9, firstly carrying out zero alignment on the measuring device 5 positioned above, namely, rotating the micro-cylinder 532 positioned above to carry out fast adjustment, so that the adjusting measuring piece 52 on the micro-screw 534 is fast close to the fixed measuring piece 51 corresponding to the adjusting measuring piece, when the adjusting measuring piece is about to contact with the fixed measuring piece 51, then rotating the ratchet wheel 533 positioned above to carry out fine adjustment, stopping rotating when a click sound is heard, at the moment, the fixed measuring piece 51 is just contacted with the adjusting measuring piece 52, then observing whether the digital display screen 531 positioned above displays a zero value, and if not, pressing a zero clearing button to complete zero alignment operation; in the same way, the "zero-checking" operation of the measuring device 5 located below is carried out.

Step three: after the upper and lower measuring devices 5 complete the zero setting operation, according to the required upper limit requirement of the dimensional tolerance at the measured position, the upper micro-cylinder 532 is quickly rotated to be quickly adjusted, and when the numerical value displayed on the upper digital display screen 531 is close to the upper limit requirement of the tolerance, namely the maximum limit size, the upper ratchet wheel 533 is slowly rotated to be finely adjusted, so that the displayed numerical value on the upper digital display screen 531 is consistent with the required upper limit value of the tolerance, namely the maximum limit size, at the measured position of the air valve 9; in the same method, the lower micro-cylinder 532 is rotated rapidly for fast adjustment, and when the displayed value of the lower digital display screen 531 is close to the lower tolerance limit, namely the minimum limit size, the lower ratchet wheel 533 is rotated slowly for fine adjustment, so that the displayed value of the lower digital display screen 531 is consistent with the lower tolerance limit, namely the minimum limit size, required by the position to be measured of the air valve 9.

Step four: after the adjustment is finished, the end face of the disc of the valve 9 to be measured is contacted with the plane of the back plate 1 to be used as measurement positioning, the central shaft of the valve 9 is positioned in the middle of the gap 8, the valve 9 is integrally positioned at the upper parts of the two measuring devices 5, the valve 9 to be measured is pushed to move downwards, the valve firstly reaches the gap 8 of the measuring device 5 with the size above the maximum limit size, if the valve 9 can not pass through the gap 8, the size of the valve 9 is not qualified, rework or elimination is needed, if the valve can pass through the gap 8, the valve 9 is pushed to continue to travel until the other gap 8 with the size of the minimum limit size is reached, if the valve can pass through the gap 8, the size of the valve 9 at the position to be measured is qualified, namely, the position to be measured of the valve 9 can pass through the gap with the maximum limit size, and when the air valve cannot pass through the other gap with the size being the minimum limit size, the size of the position to be measured of the air valve 9 is judged to be qualified, and the other conditions are unqualified.

For the subsequent detection of the same type and same position of the air valves 9, the fourth step can be directly carried out, whether the product size of the air valves 9 is qualified or not is judged by observing whether the air valves 9 can pass through the two gaps 8, but the first step, the second step and the third step are carried out again at intervals so as to limit the sizes of the zero and the gaps 8 again, and the influence of impurities and other environments on the detection size is avoided in the using process of the device; and repeating the steps from one to four for the detection of the subsequent different types of valves 9 or the detection of other parts of the same type of valves 9.

It should be noted that, when the maximum limit size and the minimum limit size are adjusted, the gap 8 between the upper fixed measuring piece 51 and the adjusting measuring piece 52 is adjusted to the maximum limit size, and the gap 8 between the lower fixed measuring piece 51 and the adjusting measuring piece 52 is adjusted to the minimum limit size, so that the air valve 9 is pushed to move from top to bottom, the operation is more convenient, and the size of the disc of the air valve 9 is not affected by the interference operation of the base 2. The above operation steps are performed according to this operation. Of course, the gap 8 between the upper fixed measuring piece 51 and the upper adjusting measuring piece 52 may be adjusted to the minimum limit size, the gap 8 between the lower fixed measuring piece 51 and the lower adjusting measuring piece 52 may be adjusted to the maximum limit size, and the valve 9 may be pushed to move from bottom to top, so as to determine whether the position to be detected of the valve 9 is qualified.

The utility model has very good beneficial effect, the size of different positions of the same valve 9 and the size of different size types of valves 9 can be measured and detected by arranging the two measuring devices 5 with adjustable size of the gap 8 and adjustable distance from the back plate 1, the application range is greatly enlarged, the device is simple to adjust and operate, low in cost, small in size and convenient to carry, and the rapid detection of different types of valves 9 on the manufacturing production line can be realized.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. It should be understood that the detailed description and specific examples, while indicating the utility model, are given by way of illustration only, since various other embodiments will become apparent to those skilled in the art upon reference to the following detailed description.

Claims

1. A quick detection device of valve, its characterized in that: including the backplate, the base that the level was placed, two survey devices that are used for spacing valve disc terminal surface of vertical placing, two survey devices pass through the connecting piece setting on the base, the base link to each other with the backplate through the adjustment connecting portion that can adjust its relative distance between with the backplate.

2. A valve shortcut detection apparatus according to claim 1, characterized in that: two survey device left and right sides edge align, one is arranged under last one, every survey device include fixed measuring piece, regulation measuring piece, regulating part, fixed measuring piece and regulation measuring piece all with backplate parallel arrangement, the connecting piece has two, fixed measuring piece is fixed on one of them connecting piece, regulation measuring piece is connected and can be adjusted its regulating part that is close to or keeps away from fixed measuring piece, regulating part fixes on another connecting piece, fixed measuring piece tip and regulation measuring piece tip between form the space.

3. A valve shortcut detection apparatus according to claim 2, characterized in that: the connecting piece is connected with the adjustable height.

4. A valve shortcut detection apparatus according to claim 3, characterized in that: every height-adjustable connecting piece include screw rod one, a plurality of nut one and two locating plates, the vertical setting of screw rod one on the base, the cover that two locating plates are parallel is established on screw rod one, the plane is adjusted fixedly through revolving nut one of twisting on screw rod one about every locating plate, the one end that the backplate was kept away from to the locating plate is connected with the survey device, it has the locating hole groove of avoiding interfering with the locating plate to open in the position that corresponds with the locating plate on the backplate.

5. A valve shortcut detection apparatus according to claim 4, characterized in that: the positioning plate is a rectangular plate, the positioning hole groove is vertically rectangular, the length in the vertical direction is greater than the length of an adjustment area of the positioning plate in the height direction, the positioning plate is matched with the width of the positioning plate in the width direction, and the length of the edge part of one end, close to the back plate, of the positioning plate, exceeding the base is greater than the adjustable maximum distance between the back plate and the base.

6. A valve shortcut detection apparatus according to claim 5, characterized in that: the measuring device further comprises a connecting rod, one end, far away from the adjusting measuring piece, of the fixing measuring piece is fixed on the connecting rod, and the positioning plate is fixedly connected to one side of the circumferential surface of the connecting rod.

7. A valve shortcut detection apparatus according to claim 1, characterized in that: the adjusting connecting portion comprises a second screw rod and a second nut, one end of the second screw rod is fixedly arranged in the center of one side face, close to the back plate, of the base, the other end of the second screw rod penetrates through the bottom of the back plate, and the second nut is screwed on the second screw rod on the front side face and the rear side face of the back plate.

8. A valve shortcut detection apparatus according to claim 7, characterized in that: the adjusting and connecting part further comprises two guide rods, the two guide rods are fixedly arranged on the base and located on two sides of the second screw rod, rod holes are respectively formed in the positions, corresponding to the guide rods, on the back plate, and the other ends of the guide rods penetrate through the rod holes in the back plate.

9. A valve shortcut detection apparatus according to any one of claims 1 to 8, characterized in that: the bottom of the back plate is provided with a plurality of supporting blocks at one side far away from the base, and the bottom surfaces of the supporting blocks, the bottom surface of the back plate and the bottom surface of the base are on the same plane.