Device and method for measuring angle of seat ring of air valve seat of air cylinder cover

Abstract

The invention provides a device and a method for measuring the angle of a cylinder cover valve seat ring, relates to the field of detection tools, and aims to solve the problem of deviation of the existing angle measurement of the seat ring, a positioning sleeve and a measuring head are respectively in sliding fit with a gauge body, and the positioning sleeve can abut against the end face of the seat ring to ensure that the axes of the gauge body and the measuring head do not deviate. The end portion of the gauge body abuts against the first position of the angle face of the seat ring to achieve radial and axial positioning, the measuring head abuts against the second position of the angle face of the seat ring through a three-jaw structure, the height difference between the first position and the second position is obtained, the positioning precision during use is improved, deviation is reduced, and the measurement accuracy is improved.

Description

Technical Field

[0001] The invention relates to the field of detection tooling, and in particular to a device and method for measuring the angle of a cylinder head valve seat ring. Background Art

[0002] The cylinder head is an important part of the engine, and its machining accuracy directly affects the working performance of the engine. When the engine is working, the combustible gas is ignited after being compressed in the cylinder head combustion chamber, causing the valve seat to bear high thermal and mechanical loads. This requires the valve seat to have high wear resistance and good sealing. If the seat ring angle of the valve seat is too large or too small, it will cause the seat ring and the valve to match poorly, increase fuel consumption and increase exhaust emissions. Therefore, high requirements are placed on the machining accuracy of the valve seat. However, due to the special structure of the seat ring, it is inconvenient to arrange general tools to measure the seat ring angle.

[0003] A Chinese patent (publication number: CN 211953998 U) discloses a deep hole inner cone angle gauge, including a fixed probe, a movable probe, a micrometer, a reset spring and a base. The fixed probe consists of a clamping section and an insertion section. The outer diameter of the clamping section is larger than the outer diameter of the insertion section. The outer diameter of the insertion section is the same as the inner hole diameter of the upper section of the workpiece to be measured. A through hole is opened in the center of the clamping section, and a plug hole coaxial with the through hole is opened in the center of the insertion section. The movable probe can slide up and down in the fixed probe. The height difference when the movable probe and the fixed probe contact the inner cone at the same time is used to convert the angle, so as to obtain the angle of the inner bottom cone of the deep hole. During the measurement process, the fixed probe and the deep hole to be measured cannot maintain a stable alignment state, and the inspection fixture is inconvenient to accurately position when in use, which can easily cause the positioning position of the fixed probe to shift, resulting in large measurement errors. In addition, when performing angle measurement and calibration on the seat ring, the movable probe is easily affected by local attachments, causing the movable probe to stop moving when it contacts the attachments, and fail to reach the state of contacting the inner cone surface, affecting the accuracy of the measurement. Summary of the invention

[0004] The purpose of the present invention is to provide a cylinder head valve seat ring angle measuring device and method in response to the defects of the prior art. A positioning sleeve and a probe are used to slide and match the gauge body respectively. The positioning sleeve can abut the end face of the seat ring to ensure that the axis of the gauge body and the probe is not offset. The end of the gauge body abuts the first position of the seat ring angle surface to achieve radial and axial positioning. The probe adopts a three-claw structure to abut the second position of the seat ring angle surface to obtain the height difference between the first position and the second position, thereby improving the positioning accuracy during use and reducing the offset to improve the measurement accuracy.

[0005] The first object of the present invention is to provide a cylinder head valve seat ring angle measuring device, which adopts the following scheme: comprising:

[0006] A gauge body, wherein a sliding hole is provided in the axial direction, a first positioning circle is formed at one axial end of the gauge body, and a distance measuring element is connected to the gauge body;

[0007] A probe is slidably matched with the sliding hole along the axial direction, and one end of the probe along the axial direction is provided with three measuring claws extending in the radial direction, and the circumscribed circle corresponding to the end of all the measuring claws away from the axis of the probe is a second positioning circle, and the diameter of the second positioning circle is smaller than the diameter of the first positioning circle, and the distance measuring element is used to obtain the distance between the first positioning circle and the second positioning circle in the axial direction;

[0008] The positioning sleeve is coaxially arranged outside the gauge body and slidably cooperates with the gauge body. One end of the positioning sleeve close to the first positioning circle is abutment surface, and the abutment surface is parallel to the plane where the first positioning circle is located.

[0009] Furthermore, a first elastic member is connected between the probe and the gauge body, and a second elastic member is connected between the gauge body and the positioning sleeve. The expansion and contraction directions of the first elastic member and the second elastic member are parallel or colinear with the sliding direction of the probe.

[0010] Furthermore, the measuring head and the positioning sleeve are respectively provided with limiting sliding grooves, and the gauge body is connected with a limiting pin which penetrates into the limiting sliding grooves.

[0011] Furthermore, the abutting surface is annular and is sleeved outside the first positioning circle of the gauge body.

[0012] Furthermore, an edge of one end corresponding to the first positioning circle of the gauge body is chamfered.

[0013] Furthermore, the end of the measuring claw corresponding to the second positioning circle is provided with a chamfer.

[0014] Furthermore, the distance measuring element is installed at one end of the gauge body away from the first positioning circle, and the probe of the distance measuring element is inserted into the sliding hole to abut against the probe to measure the sliding of the probe relative to the gauge body.

[0015] Furthermore, it also includes a calibration part, which is provided with multiple calibration parts. The calibration parts are provided with a positioning end face that fits the abutment surface and a tapered angle surface. The angle surface parameter configurations of different calibration parts are different, and the first positioning circle and the second positioning circle are respectively abutted at different axial positions of the angle surface.

[0016] A second object of the present invention is to provide a method for measuring the cylinder head valve seat angle measuring device as described in the first object, comprising:

[0017] Adjust the gauge body and drive the probe and the positioning sleeve to adjust their positions, so that the abutting surface of the positioning sleeve fits the opening end surface of the seat ring, and one end of the first positioning circle of the gauge body and one end of the measuring claw of the probe are inserted into the angle surface of the seat ring;

[0018] Push the gauge body along the axial direction so that the first positioning circle and all measuring claws contact the angle surface respectively, and the first positioning circle and the second positioning circle are in different axial positions;

[0019] The distance measuring element obtains the distance between the first positioning circle and the second positioning circle in the axial direction, and calculates the angle of the angle surface according to the diameter difference between the first positioning circle and the second positioning circle.

[0020] Furthermore, the gauge body is rotated to adjust the circumferential positions of the first positioning circle and the measuring claws, and the axial spacing when the first positioning circle and all the measuring claws contact the angle surface respectively is measured again to calculate the angle of the angle surface.

[0021] Compared with the prior art, the present invention has the following advantages and positive effects:

[0022] (1) In order to solve the problem of deviation in the current seat ring angle measurement, a positioning sleeve and a probe are used to slide and align the gauge body respectively. The positioning sleeve can abut the end face of the seat ring to ensure that the gauge body and the probe axis are not offset. The end of the gauge body abuts the first position of the seat ring angle surface to achieve radial and axial positioning. The probe adopts a three-claw structure to abut the second position of the seat ring angle surface to obtain the height difference between the first position and the second position, thereby improving the positioning accuracy during use and reducing the offset to improve the measurement accuracy.

[0023] (2) A measuring claw structure is configured at one end of the probe that contacts the angle surface to be measured. Compared with the full circle structure, when attachments appear, the position can be adjusted to avoid the attachments, thereby reducing the interference of the attachments on the measurement process. Considering the roundness deviation of the angle surface, the circumferential position can be adjusted to increase the number of measurements and the amount of data to facilitate data processing to obtain a more accurate seat ring angle.

[0024] (3) An elastic member is provided to push the positioning sleeve and the probe to maintain a stable contact state, thereby reducing the influence of gravity under different measuring postures. The cooperation of the limit slide groove and the limit pin can constrain the position of the positioning sleeve and the probe, prevent the positioning sleeve and the probe from detaching from the gauge body, and ensure the integrity of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 It is a schematic top view of the cylinder head valve seat ring angle measuring device in embodiments 1 and 2 of the present invention.

[0027] Figure 2 for Figure 1 Schematic cross-sectional view at the middle BB.

[0028] Figure 3 for Figure 1Schematic cross-sectional view at AA in the middle.

[0029] Figure 4 Schematic diagram of the structure of the first calibration component in Examples 1 and 2 of the present invention.

[0030] Figure 5 Schematic diagram of the structure of the second calibration component in Examples 1 and 2 of the present invention.

[0031] Figure 6 Schematic top view of the first calibration component in Examples 1 and 2 of the present invention.

[0032] Figure 7 Schematic top view of the second calibration component in Examples 1 and 2 of the present invention.

[0033] Among them, 1. gauge body, 2. probe, 3. positioning sleeve, 4. handle, 5. measuring claw, 6. first calibration part, 7. clamping part, 8. locking part, 9. Malmeter, 10. second calibration part. DETAILED DESCRIPTION

[0034] Example 1

[0035] In a typical embodiment of the present invention, Figure 1-Figure 7 As shown, a cylinder head valve seat ring angle measuring device is provided.

[0036] Traditional seat ring angle measuring equipment adopts a fixed structure and can only detect whether the cylinder head valve seat ring angle is within the dimensional tolerance requirement range, and cannot accurately read the specific data of the cylinder head valve seat ring angle. There are also problems that some angle measuring equipment requires high operating proficiency and is inconvenient to control the posture of the measuring equipment. In addition, the overall axial length of the seat ring is small, which is inconvenient to use the hole structure to achieve auxiliary positioning, resulting in the introduction of more errors in the measurement process of the existing angle measuring equipment, affecting the detection effect. Based on this, this embodiment provides a cylinder head valve seat ring angle measuring device, which adopts a positioning sleeve 3, a gauge body 1 and a probe 2 to form a multi-layer sliding structure. The positioning sleeve 3 can abut the end face of the seat ring to achieve auxiliary positioning and reduce the posture tilt problem. The gauge body 1 and the probe 2 can abut different positions on the angle surface of the seat ring to obtain the axial distance to infer the angle of the angle surface. At the same time, the measuring claw 5 of the probe 2 can be positioned using the three-point circle determination principle to reduce the interference of attachments and improve measurement accuracy and efficiency.

[0037] like Figure 1 and Figure 2As shown, a cylinder head valve seat angle measuring device mainly includes a positioning sleeve 3, a gauge body 1 and a probe 2 which are slidably connected in sequence. A sliding hole is axially provided inside the gauge body 1 for sliding cooperation with the probe 2. A first positioning circle is formed at one axial end of the gauge body 1 for contacting the conical angle surface of the seat ring to be measured. The gauge body 1 is connected with a distance measuring element for reading the axial position change between the probe 2 and the gauge body 1. The probe 2 slides axially with the sliding hole. One axial end of the probe 2 is provided with three measuring claws 5 extending radially. The circumscribed circle corresponding to the end of all the measuring claws 5 away from the axis of the probe 2 is the second positioning circle. By using the three-point circle determination principle, the positions of the three measuring claws 5 contacting the seat ring determine a triangle, and the circumscribed circle corresponding to the triangle is the second positioning circle.

[0038] The diameter of the second positioning circle is smaller than that of the first positioning circle. The distance measuring element is used to obtain the axial distance between the first positioning circle and the second positioning circle. After the diameter difference between the second positioning circle and the first positioning circle is known, the inclination corresponding to the angle surface can be calculated by combining the axial distance using trigonometric functions. The positioning sleeve 3 is coaxially sleeved outside the gauge body 1 and slidably cooperates with the gauge body 1. The end of the positioning sleeve 3 close to the first positioning circle is abutment surface, and the abutment surface is parallel to the plane where the first positioning circle is located.

[0039] like Figure 2 and Figure 3 As shown, the gauge body 1 serves as the main part of the measuring device, providing stable support and positioning reference; a sliding hole is axially provided inside the gauge body 1 for axial sliding fit of the probe 2, ensuring that the probe 2 can move accurately along the axial direction, constraining the radial position of the probe 2, and preventing the probe 2 from radially offset relative to the gauge body 1.

[0040] The gauge body 1 can be a split detachable structure, one part is a handle 4 for the operator to hold, and the other part is a main body for matching the probe 2 and the positioning sleeve 3. Figure 1 and Figure 2 As shown, the sliding hole passes through the handle 4 and the main body of the gauge body 1, and the distance measuring element can be installed on the handle 4.

[0041] A first positioning circle is formed at one axial end of the gauge body 1, and the first positioning circle is used to contact the first position of the seat ring angle surface to realize the radial and axial positioning of the gauge body 1 relative to the seat ring angle surface. After the seat ring contacts the gauge body 1, the radial movement of the gauge body 1 is constrained. At the same time, due to the squeezing effect of the operator's hand, the first positioning circle remains in contact with the seat ring, thereby constraining the axial position.

[0042] A distance measuring element is connected to the gauge body 1, which is used to accurately measure the axial distance between the first positioning circle and the second positioning circle. In this embodiment, the distance measuring element is installed at the end of the gauge body 1 away from the first positioning circle. The distance measuring element can use a wireless digital display Malmeter 9, which can measure and display data, and can send the data to a subsequent data processing system. The probe of the distance measuring element is inserted into the sliding hole to abut against the probe 2, and the sliding of the probe 2 relative to the gauge body 1 is measured. When the probe 2 moves relative to the gauge body 1, the axial position of the probe 2 changes, and the probe of the distance measuring element maintains contact with the probe 2. The distance measuring element measures the change of the probe 2 and displays it.

[0043] like Figure 2 and Figure 3 As shown, the Malmeter 9 is fixed in the sliding hole of the handle 4 by the clamping member 7, and the clamping member 7 and the Malmeter 9 are locked by the locking member 8. The clamping member 7 can be a rubber sleeve, and the locking member 8 can be a fixing nut, a shaft sleeve, etc.

[0044] like Figure 2 and Figure 3 As shown, the stylus 2 abuts the second position of the seat ring angle surface through a three-claw structure, and determines the height difference of the angle surface together with the first positioning circle of the gauge body 1. The stylus 2 slides axially to match the sliding hole of the gauge body 1 to ensure that the stylus 2 can move smoothly. One end of the stylus 2 along the axial direction is provided with three radially extending stylus claws 5, and the ends of the three stylus claws 5 away from the axis of the stylus 2 jointly define a triangle, and the circumscribed circle of the triangle is the second positioning circle, which is used to contact the second position of the seat ring angle surface. The diameter of the second positioning circle is smaller than the diameter of the first positioning circle, so that the stylus 2 can penetrate into the seat ring outside the gauge body 1, forming a contact position different from the first positioning circle, which is convenient for accurately measuring the height difference of the angle surface.

[0045] The positioning sleeve 3 abuts against the end face of the seat ring to ensure that the axis of the gauge body 1 and the probe 2 does not deviate during the measurement process, thereby improving the measurement accuracy. The positioning sleeve 3 is coaxially sleeved outside the gauge body 1 and slidably cooperates with the gauge body 1, allowing the positioning sleeve 3 to slide on the gauge body 1.

[0046] The end of the positioning sleeve 3 close to the first positioning circle is abutment surface, which is parallel to the plane where the first positioning circle is located, ensuring that during the measurement process, the positioning sleeve 3 can tightly abut the end face of the seat ring to prevent the gauge body 1 and the probe 2 from shifting, thereby improving the measurement accuracy.

[0047] During positioning, the first positioning circle of the gauge body 1 and the abutting surface of the positioning sleeve 3 are used to achieve radial and axial positioning, ensuring the stability of the device during the measurement process. During measurement, the axial spacing between the first positioning circle and the second positioning circle is measured using a distance measuring element. The axial spacing reflects the height difference between the first positioning circle and the second positioning circle at the contact seat ring angle surface, so that the seat ring angle can be calculated.

[0048] The sliding fit design between the positioning sleeve 3 and the gauge body 1 allows the positioning sleeve 3 to abut against the end face of the seat ring, and the gauge body 1 can slide along the axial direction at different lengths to adapt to the contact of seat rings of different sizes. Similarly, the probe 2 forms contact at other positions, which improves the versatility and practicality of the device. Accurate measurement and fast positioning make the measurement process more efficient and improve work efficiency.

[0049] A first elastic member is connected between the probe 2 and the gauge body 1 to provide axial elastic support for the probe 2. A second elastic member is connected between the gauge body 1 and the positioning sleeve 3 to provide axial elastic support for the positioning sleeve 3.

[0050] Through the expansion and contraction of the elastic member, the position of the probe 2 and the positioning sleeve 3 can be adjusted during the measurement process. During operation, pressure is applied to compress the elastic member. When the operating pressure is removed, the elastic member drives the probe 2 and the positioning sleeve 3 to rebound and reset. The first elastic member and the second elastic member can both be springs, compression springs, etc. to adapt to different measurement conditions. The adaptability and flexibility of the measuring device are improved, and stable measurement accuracy can be maintained under different working conditions.

[0051] At the same time, it can also reduce the impact and vibration generated during the measurement process, thereby reducing the impact on the measurement results and improving the stability and accuracy of the measurement.

[0052] like Figure 2 and Figure 3 As shown, the probe 2 and the positioning sleeve 3 are respectively provided with limit slots for limiting the axial movement range of the probe 2 and the positioning sleeve 3. A limit pin is connected to the gauge body 1 and inserted into the limit slot to cooperate with the limit slot to realize the limit function.

[0053] The cooperation of the limiting slide groove and the limiting pin limits the axial movement range of the probe 2 and the positioning sleeve 3, preventing damage or measurement errors caused by excessive movement, thereby ensuring the stability and reliability of the probe 2 and the positioning sleeve 3 during the measurement process.

[0054] like Figure 1 As shown, the positioning sleeve 3 and the gauge body 1 are both nearly cylindrical structures, and the abutment surface is annular and is sleeved outside the first positioning circle of the gauge body 1. The annular abutment surface can contact the seat ring end face more evenly, thereby improving the contact area and contact stability.

[0055] A chamfer is provided on the edge of one end corresponding to the first positioning circle of the gauge body 1. The chamfer position can interact with the angle surface of the seat ring, so that when the gauge body 1 is offset relative to the axis of the seat ring, the chamfer slides along the angle surface of the seat ring and aligns the seat ring and the gauge body 1. The chamfer design can reduce the stress concentration when the gauge body 1 contacts the angle surface of the seat ring, and avoid scratching or damaging the surface of the seat ring.

[0056] Similarly, the end of the measuring claw 5 corresponding to the second positioning circle is provided with a chamfer, and the chamfer on the measuring claw 5 can also guide the measuring claw 5 to be centered when contacting the angle surface of the seat ring. At the same time, the chamfer of the measuring claw 5 can reduce the stress concentration when the measuring claw 5 contacts the angle surface of the seat ring, thereby improving the measurement accuracy.

[0057] A measuring claw 5 structure is configured on the end of the probe 2 that contacts the angle surface to be measured. Compared with the full circle structure, when attachments appear, the position can be adjusted to avoid the attachments, thereby reducing the interference of the attachments on the measurement process. Considering the roundness deviation of the angle surface, the circumferential position can be adjusted to increase the number of measurements and increase the amount of data to facilitate data processing to obtain a more accurate seat ring angle.

[0058] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, there are multiple calibration parts, and each calibration part is provided with a positioning end face that fits the abutment surface and a tapered angle surface.

[0059] Different calibration parts have different angle surface parameter configurations, which are used to simulate different seat ring angle surfaces. By using calibration parts with different parameters, the measuring device can be calibrated to ensure the accuracy of the measurement results. It provides a convenient calibration method to ensure the accuracy and reliability of the measuring device.

[0060] In this application, if Figure 3 As shown, the diameter φy of the first positioning circle is 48.75±0.01 mm. Figure 2 As shown, the diameter φx of the second positioning circle is 45.5±0.01 mm.

[0061] like Figure 4 and Figure 6 As shown, in the first calibration part 6, the corresponding first angle surface is in contact with the first positioning circle and the second positioning circle of the gauge body 1 respectively, and the outer diameter φz of the first angle surface is 65mm. The preset angle value of the first angle surface is d=119°±3′, the dimension of the contact position between the first angle surface and the first positioning circle is c=48.75mm, and the dimension of the contact position between the first angle surface and the second positioning circle is a=45.5. At this time, the axial spacing between the first positioning circle and the second positioning circle measured by the distance measuring element is e, and b=0.957 is preset. When the value measured by the distance measuring element is equal to b or the difference is within the set range, it indicates that the cylinder head valve seat ring angle measurement device is accurate.

[0062] like Figure 5 and Figure 7As shown, in the second calibration part 10, the corresponding second angle surface is in contact with the first positioning circle and the second positioning circle of the gauge body 1 respectively, and the outer diameter φz of the second angle surface is 65mm. The preset angle value of the second angle surface is f=119.67°±3′, the dimension of the contact position between the first angle surface and the first positioning circle is c=48.75mm, and the dimension of the contact position between the first angle surface and the second positioning circle is a=45.5. At this time, the axial spacing between the first positioning circle and the second positioning circle measured by the distance measuring element is e, and e=0.944 is preset. When the value measured by the distance measuring element is equal to e or the difference is within the set range, it indicates that the cylinder head valve seat ring angle measurement device is accurate.

[0063] In this embodiment, two fixed diameter positions are used on the tapered angle surface, and the first positioning circle and the second positioning circle are used for floating alignment and measuring the height difference, and the height difference is converted into an angle deviation, and the specific conversion relationship is 0.013mm≈angle deviation 0.67°. The height difference between the first positioning circle and the second positioning circle on the contact seat ring angle surface is read by a distance measuring element, and the measured height difference is converted into an angle by software according to the conversion relationship, thereby realizing the accurate measurement of the cylinder head valve seat ring angle.

[0064] Example 2

[0065] In another typical embodiment of the present invention, Figure 1-Figure 7 As shown, a method for measuring the angle of a cylinder head valve seat ring is provided, using the cylinder head valve seat ring angle measuring device as in Example 1.

[0066] A method for measuring an angle of a cylinder head valve seat ring, comprising:

[0067] Adjust the gauge body 1 and drive the probe 2 and the positioning sleeve 3 to adjust their positions, so that the abutting surface of the positioning sleeve 3 fits the opening end surface of the seat ring, and one end of the first positioning circle of the gauge body 1 and one end of the measuring claw 5 of the probe 2 are inserted into the angle surface of the seat ring;

[0068] Push the gauge body 1 axially so that the first positioning circle and all the measuring claws 5 contact the angle surface respectively, and the first positioning circle and the second positioning circle are in different axial positions;

[0069] The distance measuring element obtains the distance between the first positioning circle and the second positioning circle in the axial direction, and calculates the angle of the angle surface according to the diameter difference between the first positioning circle and the second positioning circle.

[0070] The gauge body 1 is rotated to adjust the circumferential position of the first positioning circle and the measuring claw 5, and the axial spacing when the first positioning circle and all the measuring claws 5 contact the angle surface is measured again to calculate the angle of the angle surface. It is also possible to measure multiple times and take the average value, and the position of the measuring claw 5 can be adjusted during the rotation process so that the measuring claw 5 avoids the position with attachments, which is particularly suitable for the scene of testing the engine after working.

[0071] The positioning sleeve 3 and the probe 2 are used to slide and match the gauge body 1 respectively. The positioning sleeve 3 can abut the end face of the seat ring to ensure that the axes of the gauge body 1 and the probe 2 are not offset. The end of the gauge body 1 abuts the first position of the seat ring angle surface to achieve radial and axial positioning. The probe 2 adopts a three-claw structure to abut the second position of the seat ring angle surface to obtain the height difference between the first position and the second position, thereby improving the positioning accuracy during use and reducing the offset to improve the measurement accuracy.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cylinder head valve seat ring angle measuring device, characterized in that: include: The gauge body (1) has a sliding hole arranged inside along the axial direction, a first positioning circle is formed at one axial end of the gauge body (1), and a distance measuring element is connected to the gauge body (1); A probe (2) is slidably matched with the sliding hole along the axial direction, and one end of the probe (2) along the axial direction is provided with three measuring claws (5) extending in the radial direction, and the circumscribed circle corresponding to the ends of all the measuring claws (5) away from the axis of the probe (2) is a second positioning circle, and the diameter of the second positioning circle is smaller than the diameter of the first positioning circle, and the distance measuring element is used to obtain the distance between the first positioning circle and the second positioning circle in the axial direction; The positioning sleeve (3) is coaxially sleeved outside the gauge body (1) and slidably cooperates with the gauge body (1); one end of the positioning sleeve (3) close to the first positioning circle is a contact surface, and the contact surface is parallel to the plane where the first positioning circle is located.

2. The cylinder head valve seat angle measuring device according to claim 1, characterized in that: A first elastic member is connected between the probe (2) and the gauge body (1), and a second elastic member is connected between the gauge body (1) and the positioning sleeve (3). The expansion and contraction directions of the first elastic member and the second elastic member are parallel or colinear with the sliding direction of the probe (2).

3. The cylinder head valve seat angle measuring device according to claim 2, characterized in that: The measuring head (2) and the positioning sleeve (3) are respectively provided with limit sliding grooves, and the gauge body (1) is connected with a limit pin which is inserted into the limit sliding groove.

4. The cylinder head valve seat angle measuring device according to claim 1, characterized in that: The abutting surface is annular and is sleeved outside the first positioning circle of the gauge body (1).

5. The cylinder head valve seat angle measuring device according to claim 1, characterized in that: An edge of one end of the gauge body (1) corresponding to the first positioning circle is provided with a chamfer.

6. The cylinder head valve seat angle measuring device according to claim 5, characterized in that: The end of the measuring claw (5) corresponding to the second positioning circle is provided with a chamfer.

7. The cylinder head valve seat angle measuring device according to claim 1, characterized in that: The distance measuring element is installed at one end of the gauge body (1) away from the first positioning circle, and the probe of the distance measuring element is inserted into the sliding hole to abut against the measuring head (2) to measure the sliding of the measuring head (2) relative to the gauge body (1).

8. The cylinder head valve seat angle measuring device according to claim 1, characterized in that: It also includes a calibration piece, which is provided with multiple calibration pieces. The calibration piece is provided with a positioning end face that fits the abutment surface and a tapered angle surface. The angle surface parameter configurations of different calibration pieces are different. The first positioning circle and the second positioning circle are respectively abutted against different axial positions of the angle surface.

9. A method for measuring the angle of a cylinder head valve seat ring, using the cylinder head valve seat ring angle measuring device as claimed in any one of claims 1 to 8, characterized in that: include: The gauge body (1) is adjusted to drive the measuring head (2) and the positioning sleeve (3) to adjust their positions, so that the abutting surface of the positioning sleeve (3) fits the opening end surface of the seat ring, and one end of the first positioning circle of the gauge body (1) and one end of the measuring claw (5) of the measuring head (2) are inserted into the angle surface of the seat ring; Pushing the gauge body (1) in the axial direction so that the first positioning circle and all the measuring claws (5) contact the angle surface respectively, and the first positioning circle and the second positioning circle are in different axial positions; The distance measuring element obtains the distance between the first positioning circle and the second positioning circle in the axial direction, and calculates the angle of the angle surface according to the diameter difference between the first positioning circle and the second positioning circle.

10. The measuring method of the cylinder head valve seat angle measuring device according to claim 9, characterized in that: The gauge body (1) is rotated to adjust the circumferential positions of the first positioning circle and the measuring claws (5), and the axial spacing when the first positioning circle and all the measuring claws (5) contact the angle surface is measured again to calculate the angle of the angle surface.

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