A detecting device for the symmetry of the valve seat hole on both sides of a flat gate valve

Abstract

The application relates to the technical field of symmetry detection, and more specifically discloses a detection device for the symmetry of valve seat holes on both sides of a flat gate valve, which comprises a detection base, the detection base comprises a base body, a first moving groove and a second moving groove are arranged at the top of the base body, a clamping assembly is arranged in the first moving groove, a detection moving seat is arranged in the second moving groove, and a positioning base is arranged at the top of the detection moving seat; the device is provided with a transverse displacement ruler groove, a moving ruler rod and a reflecting plate, the deflection of the reflecting plate can change the position of reflected light, the high-precision center symmetry of the plane where the valve seat holes are located can be detected, the first information value formed by the average value difference of the two measuring rods and the second information value formed by the value change difference of the transverse displacement ruler groove are used to calculate the hole diameter processing offset, and the straightness of the valve seat holes can be detected.

Description

Technical Field

[0001] This invention relates to the field of symmetry detection technology, and more specifically to a device for detecting the symmetry of the valve seat holes on both sides of a flat gate valve. Background Technology

[0002] A flat gate valve is a sliding valve whose closing element is a parallel gate. The closing element can be a single gate or a double gate with an opening mechanism. The pressure of the gate against the valve seat is controlled by the medium pressure acting on the floating gate or floating valve seat.

[0003] Chinese invention patent CN116989701A discloses a device for detecting the symmetry of valve seat holes on both sides of a flat gate valve. The device includes a worktable with a top platform at its top. Slide grooves are formed in the middle and on both sides of the top platform. Positioning devices and detection devices are located on both sides of the top platform. The detection device includes a receiving screen, an infrared transmitter, and an infrared generator positioned outside the infrared transmitter. The receiving screen and infrared transmitter are fixed to both sides of the top platform. Through the detection device, the user can electrically connect it to a display screen at one end. The infrared generator in the detection device is connected to the infrared transmitter, and the infrared reflector emits infrared light onto the receiving screen. The light passes through the positioning device in the middle and the gate holes of the flat gate valve. If there is a deviation or asymmetry in the gate holes on both sides, a regular image will not appear on the receiving screen and will be transmitted to the display screen for real-time display, achieving a convenient user experience.

[0004] Therefore, it can be seen that the symmetry of the valve seat holes on both sides of a flat gate valve is usually detected by parallel light illumination. In order to maintain the illumination angle, a support device is usually used to support the outer side of the hole. As can be seen from the basic principle of detection, the outer side of the outer shell, as a non-machined surface, does not meet the conditions to serve as a reference surface. Therefore, the perpendicularity of the hole cannot be guaranteed. According to the basic mechanical processing principle during boring, if the clamping angle deflects, the remaining complete hole diameter can still make the light appear as a standard circle. Therefore, the detection error is large and it is not possible to efficiently and accurately detect the hole diameter parameters. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a device for detecting the symmetry of the valve seat holes on both sides of a flat gate valve, so as to solve the problems existing in the background art.

[0006] This invention provides the following technical solution: a detection device for the symmetry of valve seat holes on both sides of a flat gate valve, comprising a detection base, the detection base comprising a base body, the top of the base body having a first moving groove and a second moving groove, a clamping assembly installed inside the first moving groove, a detection moving seat installed inside the second moving groove, a positioning base installed on the top of the detection moving seat, a first gear groove and a second gear groove inside the base body, a first reduction gear installed inside the first gear groove, a second reduction gear installed inside the second gear groove, a worm thread rod fixedly connected to the bottom of the first reduction gear, the worm thread rod meshing with the second reduction gear to form a worm structure, a longitudinal moving groove and an optical detection groove being formed at the bottom of the second gear groove, a lifting tooth plate installed inside the longitudinal moving groove, the second reduction gear meshing with the lifting tooth plate, a reflector installed on the top of the optical detection groove, a light source installed at a 45-degree position on the bottom arc surface of the optical detection groove, a detection valve seat placed in the middle of the top of the base body, and the clamping assembly inside the detection valve seat;

[0007] Furthermore, the positioning base includes a positioning body, which consists of a positioning part and a detection part. The diameter of the positioning part is smaller than that of the detection part. A detection positioning head is installed inside the positioning part, and a plane detection head is installed on the side of the detection part. The plane detection head is used to detect the flatness of the plane where the aperture is located, calculate the plane inclination angle, and detect the parallelism of the two planes. A rotating main rod is installed inside the positioning body, and a movable ring frame is sleeved on the outside of the rotating main rod. The movable ring frame and the detection positioning head are hinged together by a connecting rod.

[0008] Furthermore, a movable ruler is hinged to the bottom of the side of the positioning body. The movable ruler consists of a hinge plate and a measuring rod. When the positioning body rises, its up-and-down movement causes the movable ruler to move the measuring rod inside the height groove. The average value of the movement of the two measuring rods is taken as the rising height value. The difference between the two average values ​​is the height displacement difference on both sides of the hole, which is called the first information value. After the positioning process is completed, the positioning body drives the support frame to move left and right, causing the lower gear plate to drive the first main gear to rotate. After the amplification process of the amplification gear set, the value is displayed through the lateral displacement groove. The difference between the values ​​of the lateral displacement grooves on both sides forms the second information value. The first information value and the second information value are combined to calculate the hole diameter machining offset, thus completing the straightness detection of the valve seat hole.

[0009] Furthermore, the bottom of the positioning body is mounted on a support frame, and a lower toothed plate is fixedly connected to the bottom of the support frame. The bottom of the lower toothed plate has a toothed groove, which meshes with the first main gear.

[0010] Furthermore, the detection moving base includes a moving housing, inside which a first main gear is installed at the bottom of the positioning base. The bottom of the first main gear is meshed with an amplifying gear set. The other end of the amplifying gear set is meshed with a synchronizing gear. A pointer is fixedly connected to the outside of the synchronizing gear inside the transverse displacement groove. Two guide rails are fixedly connected to the bottom of the moving housing, and a horizontal toothed plate is fixedly connected to the bottom of one of the guide rails.

[0011] Furthermore, the clamping assembly includes a ball holder and a mirror threaded rod. The surface of the mirror threaded rod is provided with a mirror threaded groove, and two ball holders are sleeved on the outside of the mirror threaded groove.

[0012] Furthermore, the detection positioning head includes a detection sleeve rod, the top of which has a placement groove. A positioning pressure head is installed inside the placement groove. A second spring is sleeved inside the positioning pressure head, and a first spring is sleeved outside the detection sleeve rod. When the moving ring frame moves, the detection positioning head extends outward until the positioning pressure head is completely retracted into the detection sleeve rod. The three points determine the center position, and the center is located at the center of the positioning part, thus completing the positioning. The moving distance of the moving ring frame is calculated by using the rotation angle information of the rotating main rod, and the size of the aperture is calculated.

[0013] Furthermore, the lifting toothed plate includes an upper toothed plate and a lower connecting plate. Two straight rods are fixedly connected to the top of the lower connecting plate. The lower connecting plate is installed inside the upper toothed plate through the straight rods. A third spring is sleeved on the outside of the straight rods. The lower connecting plate is hinged to both sides of the top of the reflector. The upper toothed plate is meshed with the second reduction gear.

[0014] Furthermore, a pressure sensor is installed at the bottom of the positioning head. When the positioning head is fully retracted into the inside of the detection sleeve, the pressure sensor is triggered to collect pressure information and control the rotating main rod to stop moving.

[0015] The technical effects and advantages of this invention are as follows:

[0016] 1. This invention, by incorporating a transverse displacement groove, a movable ruler, and a reflector, facilitates the use of the reflector's deflection to change the position of the reflected light, thereby enabling high-precision detection of the central symmetry of the plane containing the valve seat hole. By utilizing the first information value formed by the difference between the average values ​​of the measuring rods on both sides and the second information value formed by the difference between the numerical change of the transverse displacement groove, the hole diameter machining offset is calculated, thus completing the straightness detection of the valve seat hole.

[0017] 2. The present invention, by providing a planar detection head, facilitates the use of the three contact points of the planar detection head to contact the plane of the detection valve seat hole, and calculates the plane tilt angle through the information processing unit, thereby obtaining the tilt angle difference between the two planes and realizing the parallelism detection of the two planes.

[0018] 3. The present invention, by providing a clamping assembly, facilitates the movement of the ball holder towards both ends of the mirror threaded rod when the mirror threaded rod rotates forward. The ball of the ball holder supports the detection valve seat outward from inside the detection valve seat, thereby achieving positioning and clamping at the middle position. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the detection base structure of the present invention.

[0022] Figure 4 This is a cross-sectional view of the detection base structure of the present invention.

[0023] Figure 5 This is a side sectional view of the overall structure of the present invention.

[0024] Figure 6 Appendix of the present invention Figure 5 Schematic diagram of structure A in the middle.

[0025] Figure 7 This is a schematic diagram of the detection moving seat structure of the present invention.

[0026] Figure 8 This is a schematic diagram of the support frame structure of the present invention.

[0027] Figure 9 This is a schematic diagram of the positioning base structure of the present invention.

[0028] Figure 10 This is a schematic diagram of the detection and positioning head structure of the present invention.

[0029] Figure 11 This is a schematic diagram of the lifting toothed plate structure of the present invention.

[0030] The attached figures are labeled as follows: 1. Detection base; 101. Base body; 102. First moving groove; 103. Second moving groove; 104. First gear groove; 105. Second gear groove; 106. Longitudinal moving groove; 107. Optical detection groove; 108. Display screen; 2. Detection moving seat; 201. Moving outer shell; 202. First main gear; 203. Lateral displacement gauge groove; 204. Magnifying gear set; 205. Synchronizing gear; 206. Horizontal gear plate; 3. Positioning base; 301. Positioning body; 302. Rotating main rod; 303. Moving ring frame; 304. Detection positioning head; 3 041. Detection sleeve; 3042. Positioning pressure head; 3043. First spring; 3044. Second spring; 3045. Connecting block; 305. Flat detection head; 306. Support frame; 307. Moving ruler; 308. Height gauge groove; 309. Lower toothed plate; 4. Clamping assembly; 401. Ball holder; 402. Mirror threaded rod; 5. First reduction gear; 6. Worm threaded rod; 7. Second reduction gear; 8. Lifting toothed plate; 801. Upper toothed plate; 802. Lower connecting plate; 803. Straight rod; 804. Third spring; 9. Reflector; 10. Light source; 11. Detection valve seat. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The device for detecting the symmetry of the valve seat holes on both sides of a flat gate valve involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Reference Figures 1-4This invention provides a device for detecting the symmetry of valve seat holes on both sides of a flat gate valve, including a detection base 1. The detection base 1 includes a base body 101. The top of the base body 101 has a first moving groove 102 and a second moving groove 103. A clamping assembly 4 is installed inside the first moving groove 102, and a detection moving seat 2 is installed inside the second moving groove 103. A positioning base 3 is installed on the top of the detection moving seat 2. The base body 101 has a first gear groove 104 and a second gear groove 105. A first reduction gear 5 is installed inside the first gear groove 104, and a second reduction gear 5 is installed inside the second gear groove 105. The second reduction gear 7 and the bottom of the first reduction gear 5 are fixedly connected to a worm thread rod 6. The worm thread rod 6 and the second reduction gear 7 are meshed to form a worm structure. The bottom of the second gear groove 105 is provided with a longitudinal moving groove 106 and an optical detection groove 107. The interior of the longitudinal moving groove 106 is equipped with a lifting tooth plate 8. The second reduction gear 7 is meshed with the lifting tooth plate 8. The top of the optical detection groove 107 is equipped with a reflector 9. The bottom arc surface of the optical detection groove 107 is equipped with a light source 10 at a 45-degree position. The middle of the top of the base body 101 is placed with a detection valve seat 11. The clamping assembly 4 is inside the detection valve seat 11.

[0033] In this embodiment, it should be specifically explained that: the detection valve seat 11 is placed in reverse on the top plane of the base body 101. When the ball frame 401 moves towards both ends of the mirror threaded rod 402, the ball of the ball frame 401 supports the detection valve seat 11 outward from inside the detection valve seat 11, thereby realizing the positioning and clamping of the detection valve seat 11.

[0034] The main difference between this embodiment and the prior art is that in this embodiment, the difference in the left and right movement distance of the detection moving seat 2 is converted into the deflection angle of the reflector 9, and then the light from the light source 10 is used to achieve high-precision detection of the symmetry of the valve seat holes on both sides of the valve seat. Specifically, the detection moving seat 2, the lifting toothed plate 8, and the reflector 9 are used.

[0035] The above structure is the main structure of this embodiment, which solves the problem that current optical detection methods cannot detect symmetry information with high precision. The motor connection method between the mirror threaded rod 402 and the rotating main rod 302 is an existing structure. The specific connection structure between the mirror threaded rod 402 and the rotating main rod 302 will not be described in detail in this embodiment.

[0036] Reference Figures 5-6 The clamping assembly 4 includes a ball holder 401 and a mirror threaded rod 402. The surface of the mirror threaded rod 402 is provided with a mirror threaded groove. Two ball holders 401 are sleeved on the outside of the mirror threaded groove. When the mirror threaded rod 402 rotates, the ball holders 401 move towards both ends of the mirror threaded rod 402. The ball of the ball holder 401 supports the detection valve seat 11 outward from inside the detection valve seat 11, realizing the positioning and clamping of the middle position.

[0037] In this embodiment, it should be specifically noted that: placing the detection valve seat 11 in reverse on the top plane of the base body 101 helps to use the upper machined surface of the detection valve seat 11 as a reference surface for detection, and at the same time, the support of the ball frame 401 helps to use the inner center surface of the detection valve seat 11 as a second reference surface for symmetry detection, which provides a more accurate detection basis.

[0038] Reference Figure 7 The detection moving base 2 includes a moving housing 201. Inside the moving housing 201, at the bottom of the positioning base 3, a first main gear 202 is installed. The bottom of the first main gear 202 is meshed with an amplifying gear set 204. The other end of the amplifying gear set 204 is meshed with a synchronous gear 205. A pointer is fixedly connected to the outside of the synchronous gear 205 inside the transverse displacement groove 203. Two guide rails are fixedly connected to the bottom of the moving housing 201, and a horizontal toothed plate 206 is fixedly connected to the bottom of one of the guide rails.

[0039] In this embodiment, it should be specifically noted that: this application does not limit the reduction ratio of the amplifying gear set 204. The detection base 1 is equipped with an information processing unit. The installation method of the information processing unit and the calculation formula used for processing are existing technologies and will not be specifically described in this application.

[0040] Reference Figure 8 A movable ruler 307 is hinged to the bottom of the side of the positioning body 301. The movable ruler 307 consists of a hinge plate and a measuring rod. When the positioning body 301 rises, its up and down movement causes the movable ruler 307 to drive the measuring rod to move inside the height groove 308. Since there are two measuring rods installed on the single-sided positioning base 3, the average value of the movement of the two measuring rods is taken as the rising height value. The four measuring rods form two average values. The difference between the two average values ​​is the height displacement difference on both sides of the aperture, which is called the first information value.

[0041] In this embodiment, it should be specifically explained that: the bottom of the positioning body 301 is mounted on the support frame 306, and the bottom of the support frame 306 is fixedly connected to the lower toothed plate 309. The bottom of the lower toothed plate 309 has a toothed groove, which meshes with the first main gear 202. After the positioning process is completed, the positioning body 301 drives the support frame 306 to move left and right. The left and right movement of the support frame 306 causes the lower toothed plate 309 to drive the first main gear 202 to rotate. The rotation of the first main gear 202 is amplified by the amplification process of the amplification gear set 204 and then displayed by the lateral displacement groove 203. The difference between the values ​​of the lateral displacement grooves 203 on both sides forms the second information value. The first information value and the second information value are combined to calculate the hole diameter machining offset. At this time, the straightness detection of the valve seat hole is completed. It should be noted that the values ​​detected in this process are all changes, not displayed values. Therefore, in actual use, it is necessary to pay attention not only to the displayed values ​​after positioning, but also to the value information before positioning, so as to calculate the change values.

[0042] Reference Figure 2 and Figure 9 The positioning base 3 includes a positioning body 301, which consists of a positioning part and a detection part. The diameter of the positioning part is smaller than that of the detection part. A detection positioning head 304 is installed inside the positioning part, and a plane detection head 305 is installed on the side of the detection part. The plane detection head 305 is used to detect the flatness of the plane where the aperture is located, calculate the plane inclination angle, and detect the parallelism of the two planes. A rotating main rod 302 is installed inside the positioning body 301. A movable ring frame 303 is sleeved on the outside of the rotating main rod 302. The movable ring frame 303 and the detection positioning head 304 are hinged together by a connecting rod. When the movable ring frame 303 moves, the detection positioning head 304 extends outward until the positioning pressure head 3042 is completely retracted into the interior of the detection sleeve rod 3041. Since the three points determine the center position, the forces on the three are the same at this time, and the center is located at the center of the positioning part.

[0043] In this embodiment, it should be specifically explained that: during the above process, as the positioning ends and the positioning head 3042 is completely retracted into the inside of the detection sleeve rod 3041, the moving distance of the moving ring frame 303 is calculated by using the rotation angle information of the rotating main rod 302, and then the size of the aperture is calculated.

[0044] Reference Figure 10The detection positioning head 304 includes a detection sleeve 3041. A placement groove is provided on the top of the detection sleeve 3041. A positioning pressure head 3042 is installed inside the placement groove. A second spring 3044 is sleeved inside the detection sleeve 3041. A first spring 3043 is sleeved on the outside of the detection sleeve 3041. During the positioning process, when the positioning pressure head 3042 contacts the arc surface, the arc surface applies the same magnitude of the opposite force to the three positioning pressure heads 3042. The positioning process ends when the positioning pressure head 3042 is completely retracted into the detection sleeve 3041.

[0045] In this embodiment, it should be specifically noted that a pressure sensor is installed at the bottom of the positioning head 3042. When the positioning head 3042 is fully retracted into the inside of the detection sleeve 3041, the pressure sensor is triggered to collect pressure information and control the rotating main rod 302 to stop moving.

[0046] Reference Figure 11 The lifting gear plate 8 includes an upper gear plate 801 and a lower connecting plate 802. Two straight rods 803 are fixedly connected to the top of the lower connecting plate 802. The lower connecting plate 802 is installed inside the upper gear plate 801 via the straight rods 803. A third spring 804 is sleeved on the outer side of the straight rods 803. The lower connecting plate 802 is hinged to both sides of the top of the reflector plate 9. The upper gear plate 801 is meshed with the second reduction gear 7. When the detection moving seat 2 moves, the horizontal gear plate 206 drives the first reduction gear 5 to start rotating. The worm gear threaded rod 6 reduces the rotational force of the first reduction gear 5 and transmits it... The light is passed to the second reduction gear 7, which drives the upper gear plate 801 to rise. At this time, the moving distance of the detection moving seats 2 on both sides is converted into the rising height of the upper gear plate 801. The rising pull of the upper gear plate 801 causes the lower connecting plate 802 to apply a pulling force to both sides of the reflector 9. The difference in pulling force is the difference in the moving distance of the two detection moving seats 2. Since the middle part of the reflector 9 is installed inside the optical detection slot 107 by a hinge, the difference in pulling force causes the reflector 9 to start rotating under the action of the lower connecting plate 802. The rotation causes the light reflection position of the light source 10 to change.

[0047] In this embodiment, it should be specifically explained that during the torque transmission process, the first reduction gear 5 and the worm gear 6 reduce the moving distance of the detection moving seat 2 proportionally, which is then converted into pressure on the third spring 804, avoiding excessive stretching and compression of the third spring 804. The deflection of the reflector 9 is to amplify the detection accuracy. By increasing the radius of the optical detection slot 107, the deflection displacement per unit angle of the light reflection position of the light source 10 is larger, resulting in a more accurate detection effect.

[0048] Working principle of the invention:

[0049] The main problem solved in this embodiment is: the difference in the left and right movement distance of the detection moving seat 2 is converted into the deflection angle of the reflector 9, and then the light from the light source 10 is used to realize the high-precision detection of the symmetry of the valve seat holes on both sides of the valve seat. At the same time, the positioning effect of the detection positioning head 304 is used to change the height of the positioning body 301 and the rotation angle of the synchronous gear 205, so as to realize the detection of the symmetry of the center point of the valve seat holes on both sides. The planar detection head 305 is used to realize the detection of the flatness of the valve seat hole surface.

[0050] The specific steps are as follows:

[0051] First, place the detection valve seat 11 upside down on the top plane of the base body 101. Start the mirror threaded rod 402 to rotate forward. The ball holder 401 moves to both ends of the mirror threaded rod 402. The ball of the ball holder 401 supports the detection valve seat 11 outward from inside the detection valve seat 11, achieving positioning and clamping at the middle position. Then, push the moving housing 201 from both sides towards the middle position. Since the horizontal toothed plate 206 meshes with the first reduction gear 5, the first reduction gear 5 starts to rotate under the drive of the horizontal toothed plate 206. The worm gear threaded rod 6 reduces the rotation of the first reduction gear 5 and transmits it to the second reduction gear. At gear 7, the second reduction gear 7 drives the upper gear plate 801 to rise. Since the moving distance of the detection moving seat 2 on both sides is converted into the rising height of the upper gear plate 801, when there is a difference in the moving distance of the detection moving seat 2 on both sides, the rising height of the two upper gear plates 801 is different. At this time, the reflector 9 is deflected under the action of the lower connecting plate 802. The light from the light source 10 shines on the reflector 9. The deflection of the reflector 9 causes the position of the reflected light to change. After the data is processed by the information processing unit, it is displayed to the observer through the display screen 108. At this time, the center symmetry detection of the plane where the valve seat hole is located is completed.

[0052] During this process, all three contacts of the plane detection head 305 are in contact with the hole plane of the detection valve seat 11. Since pressure sensors are installed inside the three contacts, the relevant values ​​of the pressure sensors are calculated by the information processing unit to obtain the plane tilt angle, and then the tilt angle difference between the two planes is obtained, so as to realize the parallelism detection of the two planes.

[0053] The rotating main rod 302 is started to rotate and control the moving ring frame 303 to move towards one side of the detection positioning head 304. Since the moving ring frame 303 and the side of the detection positioning head 304 are hinged by the connecting rod, the detection positioning head 304 extends outward when the moving ring frame 303 moves, until the positioning pressure head 3042 is completely retracted into the interior of the detection sleeve rod 3041. Since the three points determine the center position, the forces on the three are the same at this time, and the center is located at the center of the positioning part. During this process, the thrust of the connecting block 3045 first overcomes the pressure of the first spring 3043, causing the part where the positioning pressure head 3042 is located to extend outward. When it contacts the arc surface, the arc surface applies a reverse force to the positioning pressure head 3042, thereby realizing the center positioning process.

[0054] During the above process, as the positioning ends, the positioning body 301 will move up and down under the action of positioning pressure. Its up and down movement causes the moving ruler 307 to drive the measuring rod to move inside the height ruler groove 308. The average value of the movement values ​​of the two measuring rods on the single-sided positioning base 3 is taken. The height displacement difference is calculated by the difference between the two average values ​​on both sides to form the first information value. The left and right movement of the positioning body 301 causes the lower tooth plate 309 to drive the first main gear 202 to rotate. The rotation of the first main gear 202 is amplified by the amplification gear set 204 and then displayed by the transverse displacement ruler groove 203. The difference between the values ​​of the transverse displacement ruler grooves 203 on both sides is taken to form the second information value. The first information value and the second information value are combined to calculate the hole diameter machining offset. At this time, the straightness detection of the valve seat hole is completed.

[0055] During the positioning process, when the positioning pressure head 3042 contacts the arc surface, the arc surface applies the same reverse force to the three positioning pressure heads 3042. The positioning process ends when the positioning pressure head 3042 is completely retracted into the inside of the detection sleeve rod 3041. At this time, the hole diameter is calculated by the rotation angle information of the rotating main rod 302.

[0056] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting the symmetry of valve seat holes on both sides of a flat gate valve, comprising a detection base (1), characterized in that: The detection base (1) includes a base body (101). The top of the base body (101) is provided with a first moving groove (102) and a second moving groove (103). A clamping assembly (4) is installed inside the first moving groove (102), and a detection moving seat (2) is installed inside the second moving groove (103). A positioning base (3) is installed on the top of the detection moving seat (2). The base body (101) is provided with a first gear groove (104) and a second gear groove (105). A first reduction gear (5) is installed inside the first gear groove (104), and a second reduction gear (7) is installed inside the second gear groove (105). The first reduction gear (5) The bottom is fixedly connected to a worm thread rod (6), which meshes with the second reduction gear (7) to form a worm structure. The bottom of the second gear groove (105) is provided with a longitudinal moving groove (106) and an optical detection groove (107). A lifting tooth plate (8) is installed inside the longitudinal moving groove (106), and the second reduction gear (7) meshes with the lifting tooth plate (8). A reflector plate (9) is installed on the top of the optical detection groove (107), and a light source (10) is installed at a 45-degree position on the bottom arc surface of the optical detection groove (107). A detection valve seat (11) is placed in the middle of the top of the base body (101), and the clamping assembly (4) is inside the detection valve seat (11). The positioning base (3) includes a positioning body (301), which is composed of a positioning part and a detection part. The diameter of the positioning part is smaller than that of the detection part. A detection positioning head (304) is installed inside the positioning part, and a plane detection head (305) is installed on the side of the detection part. The plane detection head (305) is used to detect the flatness of the plane where the aperture is located, calculate the plane inclination angle, and detect the parallelism of the two planes. A rotating main rod (302) is installed inside the positioning body (301), and a movable ring frame (303) is sleeved on the outside of the rotating main rod (302). The movable ring frame (303) and the detection positioning head (304) are hinged together by a connecting rod. The lifting gear plate (8) includes an upper gear plate (801) and a lower connecting plate (802). Two straight rods (803) are fixedly connected to the top of the lower connecting plate (802). The lower connecting plate (802) is installed inside the upper gear plate (801) through the straight rods (803). A third spring (804) is sleeved on the outside of the straight rods (803). The lower connecting plate (802) is hinged to both sides of the top of the reflector plate (9). The upper gear plate (801) is meshed with the second reduction gear (7).

2. The device for detecting the symmetry of the valve seat holes on both sides of a flat gate valve according to claim 1, characterized in that: The bottom of the side of the positioning body (301) is hinged with a movable ruler (307). The movable ruler (307) consists of a hinge plate and a measuring rod. When the positioning body (301) rises, its up and down movement causes the movable ruler (307) to drive the measuring rod to move inside the height groove (308). The average value of the movement of the two measuring rods is taken as the rising height value. The difference between the two average values ​​is the height displacement difference on both sides of the hole diameter, which is called the first information value. After the positioning process is completed, the positioning body (301) drives the support frame (306) to move left and right, so that the lower tooth plate (309) drives the first main gear (202) to rotate. After the amplification process of the amplification gear set (204), the value is displayed through the transverse displacement groove (203). The difference between the values ​​of the transverse displacement grooves (203) on both sides forms the second information value. The first information value and the second information value are combined to calculate the hole diameter machining offset, and the straightness detection of the valve seat hole is completed.

3. The device for detecting the symmetry of the valve seat holes on both sides of a flat gate valve according to claim 1, characterized in that: The bottom of the positioning body (301) is mounted on the support frame (306). The bottom of the support frame (306) is fixedly connected to a lower toothed plate (309). The bottom of the lower toothed plate (309) is provided with a tooth groove, which meshes with the first main gear (202).

4. The device for detecting the symmetry of the valve seat holes on both sides of a flat gate valve according to claim 1, characterized in that: The detection moving base (2) includes a moving housing (201). Inside the moving housing (201), at the bottom of the positioning base (3), a first main gear (202) is installed. The bottom of the first main gear (202) is meshed with an amplifying gear set (204). The other end of the amplifying gear set (204) is meshed with a synchronous gear (205). A pointer is fixedly connected inside the transverse displacement groove (203) on the outside of the synchronous gear (205). Two guide rails are fixedly connected to the bottom of the moving housing (201), and a horizontal toothed plate (206) is fixedly connected to the bottom of one of the guide rails.

5. The device for detecting the symmetry of the valve seat holes on both sides of a flat gate valve according to claim 1, characterized in that: The clamping assembly (4) includes a ball holder (401) and a mirror threaded rod (402). The surface of the mirror threaded rod (402) is provided with a mirror threaded groove, and two ball holders (401) are sleeved on the outside of the mirror threaded groove.

6. The device for detecting the symmetry of the valve seat holes on both sides of a flat gate valve according to claim 1, characterized in that: The detection positioning head (304) includes a detection sleeve (3041). The top of the detection sleeve (3041) is provided with a placement groove. A positioning pressure head (3042) is installed inside the placement groove. The positioning pressure head (3042) is located inside the detection sleeve (3041) and is sleeved with a second spring (3044). A first spring (3043) is sleeved on the outside of the detection sleeve (3041). When the moving ring frame (303) moves, the detection positioning head (304) extends outward until the positioning pressure head (3042) is completely retracted into the inside of the detection sleeve (3041). The three points determine the center position. The center is located at the center position of the positioning part, and the positioning is completed. The moving distance of the moving ring frame (303) is calculated by the rotation angle information of the rotating main rod (302), and the size of the aperture is calculated.

7. The device for detecting the symmetry of the valve seat holes on both sides of a flat gate valve according to claim 6, characterized in that: A pressure sensor is installed at the bottom of the positioning head (3042). When the positioning head (3042) is fully retracted into the detection sleeve (3041), the pressure sensor is triggered to collect pressure information and control the rotating main rod (302) to stop moving.

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