Dimension Inspection System and Method for Differentiated PVC Drainage Pipes

Abstract

This invention relates to the field of dimensional inspection technology, and more particularly to a dimensional inspection system and method suitable for PVC drainage pipes of different diameters. The system includes: a fixed frame, fixed to the ground; multiple inspection mechanisms distributed along the axis of the drainage pipe on the fixed frame; each inspection mechanism includes: a mechanism seat mounted on the fixed frame; a sliding seat that slides horizontally on the mechanism seat; a displacement detector for detecting the displacement of the sliding seat; a limiting mechanism for limiting the position of the sliding seat on the mechanism seat; two clamping seats that slide horizontally towards and away from each other on the sliding seat; two clamping blocks that slide horizontally on the two clamping seats respectively; two springs respectively disposed between the clamping seats and clamping blocks on both sides; the sliding direction of the sliding seat, clamping seats, and clamping blocks is perpendicular to the axis of the drainage pipe; and a power mechanism that drives the two clamping seats in all inspection mechanisms to move synchronously. This invention effectively solves the problems of low inspection efficiency and poor accuracy in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of dimensional inspection technology, and in particular to a dimensional inspection system and method for PVC drainage pipes of different diameters. Background Technology

[0002] In certain specific situations, it will be used such as Figure 1 The diagram shows various reducing PVC drain pipes. For these reducing PVC drain pipes, in addition to measuring the inner and outer diameters of each different section, it is also necessary to check the dimensional and positional dimensions between each section, i.e., the distance between the center axes of each section. In existing related testing technologies, checking the center axes of each section is quite difficult. Furthermore, because the center axes of each section may sometimes be small in distance from the center axes of other sections, while there is a distance between the ends, these small gaps are difficult to detect. Therefore, the testing efficiency and accuracy of reducing PVC drain pipes are low. Summary of the Invention

[0003] This invention provides a size detection system and method for PVC drainage pipes with different diameters, which can effectively solve the problems of low detection efficiency and poor detection accuracy of drainage pipes with different diameters in the prior art.

[0004] This invention provides a dimensional inspection system for PVC drainage pipes of different diameters, comprising:

[0005] The mounting bracket is fixedly installed on the ground.

[0006] Multiple testing units are distributed along the axis of the drainage pipe on a fixed frame;

[0007] Each testing institution includes:

[0008] The mechanism base is mounted on a fixed frame;

[0009] The sliding seat slides horizontally on the mechanism seat;

[0010] Displacement detector, used to detect the displacement of the slider;

[0011] The limiting mechanism is used to limit the position of the sliding seat on the mechanism base;

[0012] The two clamping seats slide horizontally towards and away from each other on the sliding seat;

[0013] Two clamping blocks slide horizontally on two clamping seats respectively;

[0014] Two springs are respectively positioned between the clamping seats and clamping blocks on both sides;

[0015] The sliding direction of the sliding seat, clamping seat, and clamping block is perpendicular to the axis of the drain pipe;

[0016] The power mechanism drives the two clamping seats in all the testing mechanisms to move closer to each other synchronously.

[0017] Furthermore, a rotating clamping screw is provided on the sliding seat; the two ends of the clamping screw are provided with threads of opposite directions, and respectively engage with two clamping seats.

[0018] Furthermore, two fixed adjusting blocks are provided on the sliding seat, and the two adjusting blocks are respectively fitted onto both ends of the clamping screw.

[0019] Furthermore, a rotating transmission shaft is also provided on the sliding seat, and the transmission shaft is connected to the clamping screw.

[0020] The power mechanism includes:

[0021] Multiple hexagonal shafts, each passing through a transmission shaft in a detection mechanism;

[0022] The transmission assembly is used to connect all the hexagonal shafts so that they rotate synchronously.

[0023] An electric motor is used as the power source for a transmission assembly.

[0024] Furthermore, a detachable mounting base is provided on the sliding seat, and the transmission shaft is mounted on the mounting base.

[0025] Furthermore, a guide rod is provided on the sliding seat, and the guide rod passes through the two clamping seats.

[0026] Furthermore, the sliding seat is provided with an outwardly extending extension rod;

[0027] The limiting mechanism includes:

[0028] The limiting block slides vertically on the mechanism seat; the limiting block is provided with a limiting groove, and the limiting groove is provided with a guide section that gradually increases in width toward the extension rod.

[0029] Furthermore, the mechanism seat is equipped with a baffle, and the sliding seat and the limiting mechanism are located on both sides of the baffle, with the extension rod passing through the baffle.

[0030] Furthermore, in each testing facility:

[0031] The mechanism seat slides horizontally on the fixed frame;

[0032] It also includes an adjusting screw, which engages with the mechanism seat.

[0033] This invention also provides a method for dimensional inspection of PVC drainage pipes with different diameters, used in the aforementioned dimensional inspection system for PVC drainage pipes with different diameters, the steps of which include:

[0034] In each testing mechanism, the two clamping seats are moved to the furthest point, and the limiting mechanism restricts the movement of the sliding seat.

[0035] Move each detection mechanism so that the distance between the center of the adjacent mechanism seat in the vertical direction of the drainage pipe axis is equal to the design distance between the center axes of the two adjacent sections of the corresponding drainage pipe.

[0036] Insert the drain pipe so that each section of the drain pipe is positioned between the two clamping blocks of the corresponding detection mechanism;

[0037] Simultaneously move the clamping seats in all the detection mechanisms, and make all the clamping seats move the same distance. After the two clamping seats in each detection mechanism move, the two clamping blocks will press against both sides of the drain pipe, and the spring will be in a compressed state.

[0038] The limit mechanism releases the restriction on the movement of the sliding block, and after a period of time, the reading of the displacement detector is read.

[0039] The sum of the readings of two adjacent displacement detectors gives the error value of the distance between the center axes of two adjacent sections of the drain pipe.

[0040] The technical solution of this invention can achieve the following technical effects:

[0041] This inspection system uses multiple inspection mechanisms working together. Each mechanism can automatically move the center of the sliding seat to the position aligned with the central axis of the drain pipe through the cooperation of clamping seats, clamping blocks and springs. Then, the displacement detector detects the moving distance of the sliding seat, so as to quickly and accurately detect the geometric dimensions and geometric tolerances between the various sections of the drain pipe, effectively improving the inspection efficiency. In addition, this inspection system can also adapt to the inspection of various types of drain pipes. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of each drainage pipe in this invention;

[0044] Figure 2 This is a schematic diagram of the dimensional detection system for PVC drainage pipes of different diameters in this invention;

[0045] Figure 3 This is a schematic diagram of the detection mechanism in this invention;

[0046] Figure 4 This is a schematic diagram showing the adjustment block of the detection mechanism in this invention being removed;

[0047] Figure 5 This is a front view of the detection mechanism in this invention;

[0048] Figure 6 This is a rear view of the detection mechanism in this invention;

[0049] Figure 7 for Figure 5 Sectional view at point A;

[0050] Figure 8 This is a schematic diagram of the power mechanism in this invention;

[0051] Figure 9 This is a schematic diagram showing the heating state of the clamping block and spring when clamping the drain pipe in this invention.

[0052] Reference numerals in the attached drawings: 1. Mechanism base; 11. Baffle; 2. Sliding seat; 21. Clamping screw; 22. Adjusting block; 23. Transmission shaft; 24. Mounting seat; 25. Guide rod; 26. Extension rod; 3. Displacement detector; 4. Limiting mechanism; 41. Limiting block; 42. Limiting groove; 5. Clamping seat; 6. Clamping block; 7. Spring; 8. Power mechanism; 81. Hexagonal shaft; 82. Transmission group; 83. Motor; 9. Adjusting screw. Detailed Implementation

[0053] The basic principles and main features of the technical solution of the present invention will be described below with reference to the accompanying drawings of the embodiments of the present invention. The following description will use one or more embodiments for a more intuitive understanding. These embodiments are merely some, not all, of the embodiments of the present invention.

[0054] In the description of this invention, the terms indicating orientation or positional relationship (such as up, down, left, right, etc.) are based on the orientation shown in the drawings or some conventional positional relationships, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the features referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0055] This invention relates to a dimensional inspection system suitable for PVC drainage pipes of different diameters, such as... Figures 2-8 As shown, it includes a fixed frame and multiple testing mechanisms. The fixed frame is fixedly installed on the ground to provide support for the entire testing system. A workbench is set on the top surface of the fixed frame for placing drainage pipes.

[0056] Multiple testing agencies are distributed along the axis of the drain pipe on a fixed frame. If the PVC drain pipe with different diameters is divided into multiple sections according to different diameter areas, then the number of testing agencies corresponds to the number of drain pipe sections, and each testing agency corresponds to one section of the drain pipe. The center of each testing agency is aligned with the middle section of the corresponding drain pipe section, so that the testing agency tests the middle section area of ​​the drain pipe section.

[0057] All testing organizations share a similar structure, and each organization comprises the following components:

[0058] The mechanism seat 1 can be fixedly mounted on the fixed frame, or the mechanism seat 1 can slide on the fixed frame in a direction perpendicular to the axis of the drain pipe;

[0059] The sliding seat 2 slides horizontally on the mechanism seat 1, and the sliding direction is perpendicular to the axis of the drain pipe;

[0060] The displacement detector 3 has a detection head that presses against the side of the sliding seat 2 to detect the displacement of the sliding seat 2 in the direction perpendicular to the axis of the drain pipe.

[0061] The limiting mechanism 4 can switch working states. In the first working state, it can limit the position of the sliding seat 2 on the mechanism seat 1, so that the sliding seat 2 and the mechanism seat 1 are relatively fixed and move synchronously. In the second working state, it will release the restriction on the sliding seat 2, so that the sliding seat 2 and the mechanism seat 1 can slide independently of each other.

[0062] Two clamping seats 5 slide horizontally on the sliding seat 2, moving closer and further apart from each other. The movement of the two clamping seats 5 must be simultaneous. Each clamping seat 5 has an upwardly extending support plate that passes through the worktable and is higher than the worktable.

[0063] Two clamping blocks 6 slide horizontally on two clamping seats 5 respectively, and are mounted on the extension plate of the clamping seats 5, so that the two clamping blocks 6 can be located above the worktable.

[0064] Two springs 7 are respectively set between the clamping seats 5 and the clamping blocks 6 on both sides, and all springs 7 have the same length;

[0065] The power mechanism 8 drives the two clamping seats 5 in all the detection mechanisms to move closer to each other in a synchronized manner.

[0066] Based on the aforementioned dimensional inspection system for PVC drainage pipes of varying diameters, this invention also relates to a dimensional inspection method for PVC drainage pipes of varying diameters, which achieves the inspection of the shape and position dimensions of the drainage pipe through specific steps, including:

[0067] In the initial stage, the power mechanism 8 is activated, causing the two clamping seats 5 in each detection mechanism to move to the farthest point. At this time, the distance between the two clamping blocks 6 will reach the maximum as the clamping seats 5 move, and all springs 7 are in a relaxed state. At the same time, the limiting mechanism 4 is activated to switch to the first working state to restrict the movement of the sliding seat 2, so that the sliding seat 2 and the mechanism seat 1 are fixed to each other.

[0068] Next, move each detection mechanism so that the distance between the centers of adjacent mechanism seats 1 in the vertical direction of the drain pipe axis is equal to the designed distance between the center axes of the two adjacent segments of the drain pipe. For example, assuming the multiple detection mechanisms are numbered 1, 2, 3... from left to right, and the segments of the drain pipe are also numbered 1, 2, 3... from left to right, if the designed distance between the center axes of segment 1 and segment 2 is 10mm, and the designed distance between the center axes of segment 2 and segment 3 is 20mm, then set the distance between the centers of detection mechanisms 1 and 2 in the vertical direction of the drain pipe axis to 10mm, and set the distance between the centers of detection mechanisms 2 and 3 in the vertical direction of the drain pipe axis to 20mm. At this point, the initial stage is complete, and the drain pipe inspection can begin.

[0069] During testing, the drain pipe is inserted, so that each section of the drain pipe is located between the two clamping blocks 6 of the corresponding testing mechanism, and the other parts of the drain pipe are supported by the worktable.

[0070] When the power mechanism 8 is activated, it moves the clamping seats 5 in all the detection mechanisms at the same time, and makes all the clamping seats 5 move the same distance. After the two clamping seats 5 in each detection mechanism move, the two clamping blocks 6 will press against the two sides of the drain pipe, and as the clamping seats 5 continue to move, the spring 7 will be in a compressed state.

[0071] Afterwards, the limiting mechanism 4 switches to the second working state, releases the restriction on the movement of the sliding seat 2, and waits for a period of time before reading the displacement detector 3. The positive and negative values ​​are retained when reading the displacement detector 3.

[0072] Subtracting the readings of two adjacent displacement detectors 3 gives the error value of the distance between the center axes of two adjacent sections of the drain pipe.

[0073] The specific principle of this detection system is as follows:

[0074] like Figure 9 As shown, by compressing the spring 7, the clamping block 6 can exert pressure on the side wall of the drain pipe. If there is no error in the central axis of each section of the drain pipe (as shown by the solid line in the figure), then as the two clamping seats 5 move closer to each other, for a drain pipe section, the distance between the clamping blocks 6 on both sides and the clamping seats 5 is equal, so the compression of the spring 7 is the same.

[0075] However, when there is an error in the center axis of a certain section of the drain pipe (as shown by the dotted line in the figure), as the two clamping seats 5 move closer to each other, one of the clamping blocks 6 will hit the side wall of the drain pipe first and stop moving, while the other clamping block 6 will move a longer distance before it can reach the side wall of the drain pipe. Since the two clamping seats 5 move the same distance, after the clamping seats 5 stop, the distance between one clamping seat 5 and the clamping block 6 will be greater than the distance between the other clamping seat 5 and the clamping block 6, and the compression of the spring 7 will be different.

[0076] As the power mechanism 8 releases the fixed constraint of the sliding seat 2, if the compression of the springs 7 on both sides is the same, the sliding seat 2 will not move. However, if the compression of the springs 7 on both sides is different, the sliding seat 2 will automatically move to a state where the compression of the springs 7 on both sides is the same under the asymmetrical elastic force of the springs 7. At this time, the displacement of the sliding seat 2 is the deviation of the central axis of the drain pipe section from the design position. Of course, due to the influence of other sections, the error value cannot be determined solely by the displacement of one detection mechanism. Therefore, this detection method uses the difference method to calculate the relative error between two adjacent detection mechanisms to ensure the accuracy of the detection results.

[0077] During the testing process, it is especially important to ensure the synchronization and equidistant movement of the clamping seats 5 in the multiple testing mechanisms. This ensures that the compression of each spring 7 remains consistent, that is, the pressure on each section of the drain pipe remains consistent. This is essential for the stability of the drain pipe. Otherwise, if the force applied to a certain part is inconsistent in timing or magnitude, the drain pipe may become skewed, affecting the final testing accuracy.

[0078] To ensure the synchronous and equidistant movement of the two clamping seats 5 in the same detection mechanism, the following structure is preferably used: a rotating clamping screw 21 is provided on the sliding seat 2; the clamping screw 21 has threads with opposite directions at both ends, the thread pitch at both ends is equal, and the threads at both ends respectively mesh with the two clamping seats 5 to form a screw-slider structure. In this way, only by rotating the clamping screw 21, the two clamping seats 5 can start moving synchronously, and when stopping, only by stopping the clamping screw 21, the two clamping seats 5 can stop synchronously. In addition, this structure also has a self-locking function, that is, only by rotating the clamping screw 21 can the movement of the clamping seats 5 be driven, and the movement of the clamping seats 5 cannot in turn drive the rotation of the clamping screw 21, thereby ensuring that the clamping seats 5 will not move and affect the compression of the spring 7 when clamping the drain pipe.

[0079] Since the diameter of each section of different models of drain pipes is different, in order to improve the application range of this detection system, it is necessary to be able to adjust the stopping position when the two clamping seats 5 are separated to adapt to the different section diameter requirements. Preferably, two fixed adjusting blocks 22 can be set on the sliding seat 2. The two adjusting blocks 22 are respectively sleeved on both ends of the clamping screw 21. The stopping position of the clamping seat 5 is limited by adjusting the blocks 22. Furthermore, the center of the adjusting block 22 can preferably be provided with a groove that connects to the outside, which facilitates the replacement of the adjusting block 2.

[0080] To ensure the synchronous and equidistant movement of the two clamping seats 5 in the detection mechanism, the traditional electronic control method requires a high degree of control accuracy. Therefore, the detection system preferably adopts the following structure: a rotating transmission shaft 23 is also provided on the sliding seat 2, and the transmission shaft 23 is connected to the clamping screw 21 through gear transmission, belt transmission or other means.

[0081] The power mechanism 8 will include:

[0082] Multiple hexagonal shafts 81, each with a regular hexagonal cross-section; a transmission shaft 23 has a through hole with a regular hexagonal cross-section at its center, and each hexagonal shaft 81 passes through a transmission shaft 23 in a detection mechanism, allowing the transmission shaft 23 to slide on the hexagonal shaft 81 and to rotate synchronously with the hexagonal shaft 81;

[0083] The transmission group 82 includes a main drive shaft and multiple transmission boxes. The main drive shaft serves as the input to all transmission boxes, and the output end of each transmission box is connected to a hexagonal rotating shaft 81. In this way, when the main drive shaft rotates or stops, it can drive all the hexagonal rotating shafts 81 to rotate or stop synchronously.

[0084] Motor 83 is used as the power source for transmission group 82 to drive the main rotating shaft to rotate.

[0085] The above structure ensures that all hexagonal shafts 81 are driven by mechanical transmission, guaranteeing synchronous rotation and stopping of multiple hexagonal shafts 81, and consequently, synchronous movement and stopping of all clamping seats 5. Furthermore, each detection mechanism can be positioned according to the shape of different drain pipes, and regardless of the detection mechanism's position, the hexagonal shaft 81 always maintains its drive over the transmission shaft 23, effectively expanding the applicability of this detection system.

[0086] Preferably, a detachable mounting base 24 is provided on the sliding seat 2, and the transmission shaft 23 is mounted on the mounting base 24. This not only facilitates the installation of the transmission shaft 23, but also makes it easier to replace the adjustment block 22. The specific replacement process is as follows: First, move the two clamping seats 5 in all the detection mechanisms to the position where they are furthest apart. Then, remove the mounting base 24 of the detection mechanism that needs to be replaced, so that the transmission shaft 23 is disengaged from the clamping screw 21. At this time, the two clamping seats 5 in the detection mechanism can be moved by manually rotating the clamping screw 21. The mounting seats 24 are brought closer together and no longer press against the adjusting block 22. After replacing the adjusting block 22 with one of a different size, the two mounting seats 24 in the detection mechanism are moved away from each other by manually rotating the clamping screw 21 to press against the adjusting block 22 again. Then the mounting seats 24 are reinstalled, so that the transmission shaft 23 and the clamping screw 21 re-establish the transmission relationship. In this way, the two clamping seats 5 in all the detection mechanisms are still moved to the farthest position from each other, so that the subsequent synchronous and equidistant movement of all clamping seats 5 can be performed normally.

[0087] Preferably, a guide rod 25 is provided on the sliding seat 2. The guide rod 25 passes through the two clamping seats 5. The guide rod 25 can guide the movement direction of the clamping seats 5 and restrict the rotation of the clamping seats 5, so as to ensure that the clamping block 6 can clamp the drain pipe smoothly.

[0088] The limiting mechanism 4 can be implemented by a variety of existing structures. This detection system provides a simpler structural form: an outwardly extending rod 26 is provided on the sliding seat 2, and the detection head of the displacement detector 3 abuts against the side of the extension rod 26.

[0089] Limiting mechanism 4 includes:

[0090] The limiting block 41 slides vertically on the mechanism base 1 via a cylinder. A limiting groove 42 is provided on the limiting block 41, and a guide section that gradually widens towards the extension rod 26 is provided on the limiting groove 42 to guide the extension rod 26 into the limiting groove 42. The side of the limiting groove 42 needs to have a vertical planar structure for fitting against the side of the extension rod 26.

[0091] In the first working state, the limiting block 41 moves upward, causing the extension rod 26 to be locked in the limiting groove 42, thereby preventing the mechanism seat 1 and the sliding seat 2 from moving relative to each other. In the second working state, the limiting block 41 moves downward, causing the limiting groove 42 to separate from the extension rod 26, thereby allowing the mechanism seat 1 and the sliding seat 2 to move relative to each other.

[0092] To avoid interference between the limiting mechanism 4 and the clamping seat 5, it is preferable to set a baffle 11 on the mechanism seat 1, with the sliding seat 2 and the limiting mechanism 4 set on both sides of the baffle 11, the extension rod 26 passing through the baffle 11, and the limiting groove 42 locking the end of the extension rod 26 that extends from it.

[0093] The mechanism seat 1 can be directly fixed to the fixed frame, but this direct fixing method is not convenient for adjusting the overall position of the detection mechanism. Therefore, this detection system adopts a setting method in which the mechanism seat 1 slides horizontally on the fixed frame. In addition, an adjusting screw 9 is also provided in each detection mechanism. The adjusting screw 9 meshes with the mechanism seat 1 to form a screw-slider structure. Similarly, the clamping screw 21 and clamping seat 5 are similar. The mechanism seat 1 can also form a self-locking structure and stop at any position, so that the detection system can adapt to the detection requirements of different types of drainage pipes.

[0094] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for dimensional inspection of PVC drainage pipes with different diameters, characterized in that, The following dimensional inspection systems are suitable for PVC drainage pipes of different diameters: The mounting bracket is fixedly installed on the ground. Multiple testing mechanisms are distributed along the axis of the drain pipe on the fixed frame; Each of the aforementioned testing institutions includes: Mechanism base (1) is mounted on the fixed frame; The sliding seat (2) slides horizontally on the mechanism seat (1); Displacement detector (3) is used to detect the displacement of the sliding block (2); A limiting mechanism (4) is used to limit the position of the sliding seat (2) on the mechanism seat (1); The two clamping seats (5) slide horizontally towards and away from each other on the sliding seat (2); Two clamping blocks (6) slide horizontally on the two clamping seats (5), respectively; Two springs (7) are respectively disposed between the clamping seat (5) and the clamping block (6) on both sides; The sliding direction of the sliding seat (2), the clamping seat (5), and the clamping block (6) is perpendicular to the axis of the drain pipe; The power mechanism (8) drives the two clamping seats (5) in all the detection mechanisms to move closer to each other synchronously; The method for dimensional inspection of PVC drainage pipes with different diameters is as follows: In each testing mechanism, the two clamping seats (5) are moved to the farthest point, and the limiting mechanism (4) restricts the movement of the sliding seat (2). Move each detection mechanism so that the center of the adjacent mechanism seat (1) is equal to the design distance of the center axis of the two adjacent sections of the drainage pipe in the vertical direction of the drainage pipe axis; Insert the drain pipe so that each section of the drain pipe is positioned between the two clamping blocks (6) of the corresponding detection mechanism; At the same time, move all the clamping seats (5) in all the detection mechanisms and make all the clamping seats (5) move the same distance. After the two clamping seats (5) in each detection mechanism move, the two clamping blocks (6) will press against the two sides of the drain pipe, and the spring (7) will be in a compressed state. The limiting mechanism (4) releases the restriction on the movement of the sliding seat (2), and after waiting for a period of time, reads the reading of the displacement detector (3); The sum of the readings of two adjacent displacement detectors (3) is the error value of the distance between the center axes of two adjacent sections of the drain pipe.

2. The method for dimensional inspection of PVC drainage pipes with different diameters according to claim 1, characterized in that, In the dimensional inspection system for PVC drainage pipes of different diameters, a rotating clamping screw (21) is provided on the sliding seat (2); the two ends of the clamping screw (21) are provided with threads of opposite directions and respectively engage with the two clamping seats (5).

3. The method for dimensional inspection of PVC drainage pipes with different diameters according to claim 2, characterized in that, In the size detection system for PVC drainage pipes of different diameters, two fixed adjustment blocks (22) are provided on the sliding seat (2), and the two adjustment blocks (22) are respectively sleeved on both ends of the clamping screw (21).

4. The method for dimensional inspection of PVC drainage pipes with different diameters according to claim 2, characterized in that, In the size detection system applicable to PVC drainage pipes of different diameters, the sliding seat (2) is also provided with a rotating transmission shaft (23), and the transmission shaft (23) is connected to the clamping screw (21) in a transmission connection. The power mechanism (8) includes: Multiple hexagonal shafts (81), each of the hexagonal shafts (81) passing through a transmission shaft (23) in one of the detection mechanisms; A transmission assembly (82) is used to connect all the hexagonal shafts (81) so that they rotate synchronously; An electric motor (83) is used as the power source for the transmission assembly (82).

5. The method for dimensional inspection of PVC drainage pipes with different diameters according to claim 4, characterized in that, In the dimensional inspection system for PVC drainage pipes of different diameters, a detachable mounting base (24) is provided on the sliding seat (2), and the transmission shaft (23) is provided on the mounting base (24).

6. The method for dimensional inspection of PVC drainage pipes with different diameters according to claim 4, characterized in that, In the dimensional inspection system for PVC drainage pipes of different diameters, a guide rod (25) is provided on the sliding seat (2), and the guide rod (25) passes through the two clamping seats (5).

7. The method for dimensional inspection of PVC drainage pipes with different diameters according to claim 1, characterized in that, In the dimensional detection system applicable to PVC drainage pipes of different diameters, the sliding seat (2) is provided with an outwardly extending extension rod (26); The limiting mechanism (4) includes: The limiting block (41) slides vertically on the mechanism seat (1); the limiting block (41) is provided with a limiting groove (42), and the limiting groove (42) is provided with a guide section whose width gradually increases toward the extension rod (26).

8. The method for dimensional inspection of PVC drainage pipes with different diameters according to claim 7, characterized in that, In the size detection system applicable to PVC drainage pipes of different diameters, the mechanism seat (1) is provided with a baffle (11), the sliding seat (2) and the limiting mechanism (4) are provided on both sides of the baffle (11), and the extension rod (26) passes through the baffle (11).

9. The method for dimensional inspection of PVC drainage pipes with different diameters according to claim 1, characterized in that, In the dimensional inspection system applicable to PVC drainage pipes of different diameters, in each of the inspection mechanisms: The mechanism seat (1) slides horizontally on the fixed frame; it also includes an adjusting screw (9) that engages with the mechanism seat (1).

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