A tooling for detecting the gap in a mixing frame and its design method

Abstract

This invention relates to a fixture for detecting the gap between stirring frames and its design method. The fixture includes a gearbox and a standard stirring frame mounted on an output shaft of the gearbox. The input shaft of the gearbox is connected to the output end of an external drive device. Several laser rangefinders are arranged on the outer contour of the standard stirring frame. Each laser rangefinder is used to detect the distance between the outer contour of the standard stirring frame and the outer contour of the stirring frame to be tested. To ensure that the gap data that meets the usage requirements is measured with the minimum number of laser rangefinders, the arrangement positions of the laser rangefinders are analyzed and calculated. By setting up the gearbox and the standard stirring frame, fully automatic, all-angle detection of the stirring frame gap can be achieved with high detection accuracy and good consistency of detection results. Under the condition that three laser rangefinders are arranged on each stirring leg, the repeatability can reach 98%, and both detection efficiency and detection accuracy can be effectively guaranteed.

Description

Technical Field

[0001] This invention relates to the field of auxiliary equipment technology for mixers, and in particular to a tooling for detecting the gap between mixing frames and its design method. Background Technology

[0002] Twin-blade mixers are widely used chemical equipment in fields such as new energy and food. They have two mixing frames inside. To ensure the working efficiency of the twin-blade mixer and prevent direct or indirect interference between the two mixing frames during operation, the minimum distance between their outer contours must be maintained within a certain range during rotation. Therefore, it is necessary to perform gap detection on the manufactured pair of mixing frames.

[0003] In the existing technology, the gap between the two stirring frames is detected manually by measuring the workpiece. This detection method has the disadvantages of being cumbersome, having low gap detection accuracy, poor consistency of detection results, low detection efficiency, and difficulty in ensuring product quality. Summary of the Invention

[0004] To address the shortcomings of existing production technologies, the applicant provides a tooling and design method for detecting the gap between mixing frames. By setting up a gearbox and a standard mixing frame, fully automatic, all-angle detection of the gap between mixing frames can be achieved. The detection accuracy is high, and the consistency of the detection results is good. With three laser rangefinders arranged on each mixing leg, the repeatability can reach 98%, and both detection efficiency and detection accuracy can be effectively guaranteed.

[0005] The technical solution adopted in this invention is as follows:

[0006] A design method for a stirring frame gap detection fixture, the stirring frame gap detection fixture includes a gearbox and a standard stirring frame mounted on an output shaft of the gearbox;

[0007] The input shaft of the gearbox is connected to the output end of the external drive device. Several laser rangefinders are arranged on the outer contour of the standard stirring frame. A single laser rangefinder is used to detect the distance between the outer contour of the standard stirring frame and the outer contour of the stirring frame to be tested.

[0008] During testing, the stirring frame under test is mounted on another output shaft of the gearbox. An external drive device drives the stirring frame under test and the standard stirring frame to rotate simultaneously through the gearbox. A laser range sensor collects the distance signal between the outer contour of the stirring frame under test and the outer contour of the standard stirring frame during the entire rotation cycle.

[0009] To ensure that gap data meeting usage requirements can be measured using the minimum number of laser rangefinders, the placement of the laser rangefinders is analyzed and calculated:

[0010] S1. Based on the shape parameters of the standard mixing frame itself and the application scenario, set the connection point between the outer contour line of the first mixing leg of the standard mixing frame and the outer contour line of the connecting rod of the standard mixing frame as the starting point O;

[0011] S2. Establish a spatial rectangular coordinate system O-xyz with the starting point O as the origin, where the x-axis is along the length of the connecting rod of the standard stirring frame and points to the second stirring leg of the standard stirring frame;

[0012] S3. Based on the structural dimensions of the standard stirring frame and the relative position between the stirring frame to be tested and the standard stirring frame, determine the constraint equation P(X, Y, Z) for the installation position of a single laser rangefinder sensor:

[0013] (1)

[0014] In the formula, X represents the x-axis component of the projection point of the installation position of a single laser rangefinder on the xOy plane.

[0015] Y represents the y-direction component of the installation position of a single laser rangefinder sensor projected onto the xOy plane.

[0016] Z represents the installation height of a single laser rangefinder sensor.

[0017] α represents the angle between the line connecting the projection point of a single laser rangefinder sensor on the xOy plane and the center of rotation of the standard stirring frame, and the x-axis.

[0018] D represents the outer diameter of the standard stirring frame.

[0019] L represents the height of the standard mixing frame;

[0020] S4. The specific arrangement position of a single laser rangefinder on the outer contour line of the first stirring leg of the standard stirring frame is calculated according to formula (1);

[0021] S5. Install a laser rangefinder on the outer contour line of the second stirring leg of the standard stirring frame. The laser rangefinders on the first stirring leg and the second stirring leg are arranged symmetrically to meet the ranging requirements.

[0022] S6. Determine the layout of each gear in the gearbox based on the size parameters of the mixer to be installed with the mixing frame to be tested and the installation environment;

[0023] S7. Design complete.

[0024] As a further improvement to the above technical solution:

[0025] The design dimensions of the mixing frame to be tested are consistent with those of the standard mixing frame.

[0026] An encoder disk is installed on the output shaft of the gearbox connected to the standard stirring frame. A position pulse sensor is installed on the standard stirring frame. Both the position pulse sensor and the encoder disk are connected to a micro PC via a signal acquisition card.

[0027] The micro PC is electrically connected to the UPS power supply.

[0028] In S4, the real-time rotation angle of the standard stirring frame is tracked by an encoder disk and a position pulse sensor.

[0029] The external fitting of the mixing frame gap detection fixture is a standard mixing tank. The standard mixing tank has the same size as the mixing tank inside the mixer to be fitted with the mixing frame to be tested. At this time, the laser rangefinder installed on the connecting rod of the standard mixing frame can detect the gap distance between the standard mixing frame and the bottom wall of the standard mixing tank, and the laser rangefinder installed on the mixing leg of the standard mixing frame can detect the gap distance between the standard mixing frame and the inner side wall of the standard mixing tank.

[0030] A mixing frame gap detection fixture designed using the above design method includes a standard mixing frame with three laser rangefinders arranged on a single mixing leg. When the angle α between the line connecting the projection point of a single laser rangefinder on the xOy plane and the rotation center point of the standard mixing frame and the x-axis is 25°, 45°, and 65°, the corresponding arrangement positions of the laser rangefinders on the first mixing leg are P[X, 0.4663(D / 2-X), Z], P[X, (D / 2-X), Z], and P[X, 2.1445(D / 2-X), Z].

[0031] The standard stirring frame is connected to one output shaft of the gearbox. The gearbox has the following structure: it includes a casing with an open top, and a cover plate is installed at the open top.

[0032] The chassis has several first through holes in its opening, and the end face of the cover plate has several second through holes corresponding to the first through holes. A single rotating shaft is installed in both the single second through hole and the corresponding first through hole.

[0033] The rotating shaft includes a central shaft as an input shaft, and a first stirring shaft group and a second stirring shaft group as output shafts. The first stirring shaft group includes a first stirring shaft symmetrically arranged along the central shaft, and the second stirring shaft group includes a second stirring shaft symmetrically arranged along the central shaft. A first central gear and a second central gear are sequentially mounted on the shaft of the central shaft. The pitch circle diameter of the second central gear is larger than that of the first central gear. The first central gear meshes with a first planetary gear set. The first planetary gear set includes first planetary gears respectively mounted on the shaft of the first stirring shaft. The second central gear meshes with a second planetary gear set. The second planetary gear set includes second planetary gears respectively mounted on the shaft of the second stirring shaft.

[0034] Each of the first and second through holes is fitted with a pressure cap, and the pressure cap has a third through hole for extending the rotating shaft outside the gearbox.

[0035] Several leveling feet are fitted on the outer bottom wall of the chassis.

[0036] The beneficial effects of this invention are as follows:

[0037] This invention features a compact and reasonable structure and is easy to operate. By designing a tooling for detecting the gap of the stirring frame, it can complete the full circumference detection of the gap of the stirring frame, simplifying the detection process. The detection efficiency and accuracy are significantly improved compared to manual detection methods, and the detection results have good repeatability and consistency, which can effectively ensure product quality.

[0038] The present invention also has the following advantages:

[0039] (1) By setting up a micro PC and a signal acquisition card, the present invention can realize the automated detection and analysis of the gap detection process between the mixing frames and between the mixing frame and the mixing tank without manual intervention, which can effectively improve production efficiency. Furthermore, the detection results during the detection process are traceable, which facilitates the subsequent analysis of the location and gap size of the non-conforming points, thereby providing support for the improvement of the structural design of the mixing frame, so that the mixing frame can improve the uniformity of material mixing during the application process, thereby improving the quality of the mixed material.

[0040] (2) The mixing frame gap detection fixture provided by the present invention is simple and convenient to operate. It is only necessary to put the bushing of the mixing frame to be tested on the corresponding mixing shaft end to quickly replace the corresponding gap measuring component, thereby meeting the gap detection of different mixing frames and improving the interchangeability and versatility of the gap detection fixture.

[0041] (3) In this invention, a mixing tank can also be installed outside the gap detection fixture, and corresponding sensors can be arranged on the connecting rod of the mixing frame, so that the gap detection fixture can realize automatic detection of the gap between the mixing frames and between the mixing frame and the inner wall of the mixing tank, thereby effectively monitoring the gap of the mixing frame and improving the detection accuracy and efficiency of the gap of the mixing frame.

[0042] (4) In this invention, according to the product structure and the position requirements of the stirring frame, the mechanical structure adopts a multi-gear meshing structure. By reasonably arranging the position of the rotating shaft in the gearbox, the relative position between the stirring frames is consistent with the actual working environment of the stirring frame to be tested, thus ensuring the reliability of the test results.

[0043] (5) In this invention, by adopting a multi-set gear meshing transmission structure, the stirring frame can achieve 360° full circumference arbitrary angle rotation, and can effectively ensure that the rotation angle of the two stirring frames is consistent, thereby realizing multi-directional detection of the gap between the stirring frames and between the stirring frame and the inner wall of the stirring tank; at the same time, two sets of gear transmission groups of different sizes are set, so that one gap detection fixture can be used to detect two sets of stirring frames of different sizes, improving the flexibility of use. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of the present invention.

[0045] Figure 2 This is a top view of the gearbox in this invention.

[0046] Figure 3 This is a schematic diagram of the structure in which the gear set and the stirring frame are installed together in this invention.

[0047] Figure 4 This is a schematic diagram of the installation structure of the present invention with two different sizes of test stirring frames.

[0048] Figure 5 The principle of laser rangefinder sensor placement in this invention Figure 1 .

[0049] Figure 6 The principle of laser rangefinder sensor placement in this invention Figure 2 .

[0050] Figure 7 This is a schematic diagram of the invention in its working state. Figure 1 .

[0051] Figure 8 This is a schematic diagram of the invention in its working state. Figure 2 .

[0052] Figure 9 This is a schematic diagram of the invention in its working state. Figure 3 .

[0053] The components include: 1. Gearbox; 2. Stirring frame to be tested; 3. Standard stirring frame; 4. Micro PC; 5. UPS power supply; 6. Signal acquisition card; 7. Position pulse sensor; 8. Encoder disk; 9. Laser rangefinder sensor.

[0054] 101. Chassis; 102. Central shaft; 103. First stirring shaft; 104. Second stirring shaft; 105. First central gear; 106. Second central gear; 107. First planetary gear; 108. Second planetary gear; 109. Cover plate; 110. Pressure cap; 111. First through hole; 112. Second through hole; 113. Third through hole; 114. Leveling feet. Detailed Implementation

[0055] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0056] like Figures 1-9 As shown, a design method for a stirring frame gap detection fixture is provided. The stirring frame gap detection fixture includes a gearbox 1 and a standard stirring frame 3 mounted on an output shaft of the gearbox 1.

[0057] The input shaft of gearbox 1 is connected to the output end of an external drive device. Several laser rangefinders 9 are arranged on the outer contour of the standard stirring frame 3. Each laser rangefinder 9 is used to detect the distance between the outer contour of the standard stirring frame 3 and the outer contour of the stirring frame 2 to be tested.

[0058] During the test, the test stirring frame 2 is mounted on another output shaft of the gearbox 1. The external drive device drives the test stirring frame 2 and the standard stirring frame 3 to rotate simultaneously through the gearbox 1. The laser range sensor 9 collects the distance signal between the outer contour of the test stirring frame 2 and the outer contour of the standard stirring frame 3 during the entire rotation cycle.

[0059] The design dimensions of the stirring frame 2 to be tested are the same as those of the standard stirring frame 3;

[0060] To ensure that gap data meeting usage requirements can be measured using the minimum number of laser rangefinders 9, the arrangement of the laser rangefinders 9 is analyzed and calculated:

[0061] S1. Based on the shape parameters of the standard stirring frame 3 itself and the application scenario, the connection point between the outer contour line of the first stirring leg of the standard stirring frame 3 and the outer contour line of the connecting rod of the standard stirring frame 3 is set as the starting point O.

[0062] S2. Establish a spatial rectangular coordinate system O-xyz with the starting point O as the origin, where the x-axis is along the length of the connecting rod of the standard stirring frame 3 and points to the second stirring leg of the standard stirring frame 3;

[0063] S3. Based on the structural dimensions of the standard stirring frame 3 and the relative position between the stirring frame 2 to be tested and the standard stirring frame 3, determine the constraint equation P(X, Y, Z) for the installation position of a single laser rangefinder 9:

[0064] (1)

[0065] In the formula, X represents the x-axis component of the projection point of the installation position of a single laser rangefinder 9 onto the xOy plane.

[0066] Y represents the y-direction component of the projection point of the installation position of a single laser rangefinder 9 onto the xOy plane.

[0067] Z represents the installation height of a single laser rangefinder sensor 9.

[0068] α represents the angle between the line connecting the projection point of the single laser rangefinder 9 on the xOy plane and the rotation center point of the standard stirring frame 3, and the x-axis.

[0069] D represents the outer diameter of the standard stirring frame 3.

[0070] L represents the height of the standard mixing frame 3;

[0071] S4. The specific arrangement position of a single laser rangefinder 9 on the outer contour line of the first stirring leg of the standard stirring frame 3 is calculated according to formula (1);

[0072] S4.1. The real-time rotation angle of the standard stirring frame 3 is tracked by the encoder disk 8 and the position pulse sensor 7;

[0073] S5. Install a laser rangefinder 9 on the outer contour line of the second stirring leg of the standard stirring frame 3. The laser rangefinders 9 on the first stirring leg and the second stirring leg are arranged symmetrically to meet the ranging requirements.

[0074] S6. Based on the size parameters of the mixer to be installed with the mixing frame 2 to be tested and the installation environment, determine the layout of each gear in the gearbox 1;

[0075] S7. Design complete.

[0076] The external part of the mixing frame gap detection fixture can also be fitted with a standard mixing tank. The standard mixing tank has the same dimensions as the mixing tank inside the mixer to be installed with the mixing frame 2 under test. In this case, the laser rangefinder 9 installed on the connecting rod of the standard mixing frame 3 can detect the gap distance between the standard mixing frame 3 and the inner bottom wall of the standard mixing tank, and the laser rangefinder 9 installed on the mixing leg of the standard mixing frame 3 can detect the gap distance between the standard mixing frame 3 and the inner side wall of the standard mixing tank. By collecting the gap data between the standard mixing frame 3 and the standard mixing tank, the gap data between the mixing frame 2 under test and the standard mixing tank can be calculated, thereby realizing the automatic detection of the gap between the mixing frame 2 under test and the inner wall of the standard mixing tank, simulating the working environment of the mixing frame 2 under test.

[0077] like Figures 1-9 As shown, a tooling for detecting the gap of a stirring frame designed using the above-described design method has the following structure and function:

[0078] An encoder disk 8 is mounted on the output shaft of the gearbox 1, which is connected to the standard stirring frame 3. A position pulse sensor 7 is mounted on the standard stirring frame 3. Both the position pulse sensor 7 and the encoder disk 8 are connected to the micro PC4 via a signal acquisition card 6. The micro PC4 is electrically connected to the UPS power supply 5. During the gap detection process, the micro PC4 reads the data measured by the laser rangefinder 9 and the position pulse sensor 7. The laser rangefinder 9 can continuously acquire data during the gap detection process. The micro PC4 compares the measurement results with the standard gap range, thereby realizing the automated detection and analysis of the stirring frame gap detection process. The detection process is traceable, which facilitates subsequent analysis of the location of non-conforming points and provides data support for the improvement of the stirring frame's structural design.

[0079] The laser rangefinder 9 is also electrically connected to the micro PC4 via the signal acquisition card 6.

[0080] The standard stirring frame 3 includes three laser rangefinders 9 arranged on a single stirring leg. When the angle α between the line connecting the projection point of a single laser rangefinder 9 on the xOy plane and the rotation center of the standard stirring frame 3 and the x-axis is 25°, 45°, and 65°, the corresponding positions of the laser rangefinder 9 on the first stirring leg are P[X, 0.4663(D / 2-X), Z], P[X, (D / 2-X), Z], and P[X, 2.1445(D / 2-X), Z]. After multiple tests, selecting angles α of 25°, 45°, and 65° ensures a 98% repeatability consistency of the stirring frame gap detection fixture's test results.

[0081] Depend on Figure 5It can be seen that the value of the x-direction component X of the projection point of the installation position of a single laser rangefinder 9 on the xOy plane is determined according to the outer contour diameter D of the standard stirring frame 3 and the angle α between the line connecting the projection point of the installation position of the single laser rangefinder 9 on the xOy plane and the rotation center point of the standard stirring frame 3 and the x-axis: Figure 5 Connect point P in the standard stirring frame 3 to the rotation center point Q. The distance between the line connecting points P and Q is equal to D / 2. The angle between the line connecting points P and Q and the X-axis is equal to α. Then the value of X can be calculated.

[0082] A standard stirring frame 3 is connected to one output shaft of a gearbox 1. The gearbox 1 has the following structure: a housing 101 with an open top, and a cover plate 109 is installed at the open top; several first through holes 111 are opened in the open top of the housing 101, and several second through holes 112 corresponding to the first through holes 111 are opened on the end face of the cover plate 109; a single rotating shaft is installed in both the second through hole 112 and the corresponding first through hole 111; the rotating shaft includes a central shaft 102 as an input shaft, and a first stirring shaft group and a second stirring shaft group as output shafts. The first stirring shaft group includes first stirring shafts 103 symmetrically arranged along the central shaft 102. The second stirring shaft assembly includes a second stirring shaft 104 symmetrically arranged along the central shaft 102. A first central gear 105 and a second central gear 106 are sequentially mounted on the shaft of the central shaft 102. The pitch circle diameter of the second central gear 106 is larger than that of the first central gear 105. The first central gear 105 meshes with a first planetary gear set for transmission. The first planetary gear set includes first planetary gears 107 respectively mounted on the shaft of the first stirring shaft 103. The second central gear 106 meshes with the second planetary gear set for transmission. The second planetary gear set includes second planetary gears 108 respectively mounted on the shaft of the second stirring shaft 104. An external drive device drives the central shaft 102 to rotate. The central shaft 102 drives the first stirring shaft 103 to rotate through the first central gear 105 and the first planetary gear 107, and simultaneously drives the second stirring shaft 104 to rotate through the second central gear 106 and the second planetary gear 108.

[0083] The gearbox 1 is equipped with two gear transmission systems, which are installed in conjunction with two sets of stirring shafts. By setting two sets of gear transmission sets of different sizes, one gap detection fixture can be used to detect two sets of stirring frames of different sizes, thus improving the flexibility of use.

[0084] When testing the stirring frame 2 with different design dimensions, a standard stirring frame 3 corresponding to its design dimensions must be used.

[0085] Each of the single first through hole 111 and the single second through hole 112 is fitted with a pressure cap 110. The pressure cap 110 has a third through hole 113 for allowing the rotating shaft to extend outside the gearbox 1. Several leveling feet 114 are fitted on the outer bottom wall of the chassis 101. The pressure cap 110 prevents dust from falling into the chassis 101. The leveling feet 114 are provided with external threads and are fitted on the bottom of the chassis 101 to keep the chassis 101 level.

[0086] The working process of the mixing frame gap detection fixture is as follows:

[0087] Taking a certain model of stirring frame with design dimensions of 868mm outer diameter D1 and 1155mm height L1 as an example, a stirring frame gap detection fixture is used to test it. At this time, the outer diameter D of the standard stirring frame 3 is 868mm, the height L of the standard stirring frame 3 is 1155mm, and the installation positions of the laser rangefinder 9 on the first stirring leg are P[40.7, 183.4, 278.3], P[127.1, 306.9, 661.9], and P[250.6, 393.3, 1023.6], in mm. The corresponding laser rangefinder 9 are symmetrically arranged on the second stirring leg. Then, the standard stirring frame 3 is installed on one of the first stirring shafts 103, and the stirring frame 2 to be tested is installed on the other first stirring shaft 103. The test begins, and the test process is as follows:

[0088] The output end of the external drive device is connected to the central shaft 102;

[0089] An external drive device drives the central shaft 102 to rotate. The central shaft 102 drives the corresponding first stirring shaft 103 to rotate through the first central gear 105 and the first planetary gear 107. At this time, the two second stirring shafts 104 are idle.

[0090] During the process of the two first stirring shafts 103 driving the stirring frame 2 under test and the standard stirring frame 3 to rotate respectively, the laser range sensor 9 continuously detects the gap between the two stirring frames and transmits the detection results to the micro PC4. The micro PC4 reads, records and displays the test results.

[0091] This completes the testing of the stirring frame 2 to be tested.

[0092] Based on the installation space of the mixing frame and the gap requirements between the two mixing frames, this invention provides a mixing frame gap detection fixture and its design method. By rationally arranging the installation positions of each rotating shaft in the gearbox 1, the position layout of the mixing frame under test 2 and the standard mixing frame 3 is ensured to be consistent with their installation environment, thereby effectively ensuring the reliability of the test results. The rotating shaft and gear transmission assembly enable the two mixing frames to achieve 360° full circumference rotation, and the rotation angle can always be kept consistent, solving the problems of unreliable mixing frame gap detection accuracy and low measurement efficiency, thereby improving the problems of interference and poor mixing effect during the application of the mixing frame.

[0093] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A design method for a tooling for detecting the gap of a stirring frame, characterized in that: The mixing frame gap detection fixture includes a gearbox (1) and a standard mixing frame (3) mounted on an output shaft of the gearbox (1); The input shaft of the gearbox (1) is connected to the output end of the external drive device. Several laser range sensors (9) are arranged on the outer contour of the standard stirring frame (3). A single laser range sensor (9) is used to detect the distance between the outer contour of the standard stirring frame (3) and the outer contour of the stirring frame (2) to be tested. During the test, the stirring frame (2) to be tested is installed on another output shaft of the gearbox (1). The external drive device drives the stirring frame (2) to be tested and the standard stirring frame (3) to rotate simultaneously through the gearbox (1). The laser range sensor (9) collects the distance signal between the outer contour of the stirring frame (2) to be tested and the outer contour of the standard stirring frame (3) during the entire rotation cycle. To ensure that the minimum number of laser rangefinders (9) is used to measure the gap data that meets the usage requirements, the arrangement of the laser rangefinders (9) is analyzed and calculated: S1. Based on the shape parameters of the standard stirring frame (3) itself and the application scenario, set the connection point between the outer contour line of the first stirring leg of the standard stirring frame (3) and the outer contour line of the connecting rod of the standard stirring frame (3) as the starting point O; S2. Establish a spatial rectangular coordinate system O-xyz with the starting point O as the origin, where the x-axis is along the length of the connecting rod of the standard stirring frame (3) and points to the second stirring leg of the standard stirring frame (3); S3. Based on the structural dimensions of the standard stirring frame (3) and the relative position between the stirring frame to be tested (2) and the standard stirring frame (3), determine the constraint equation P(X, Y, Z) for the installation position of a single laser rangefinder (9): （1） In the formula, X represents the x-direction component of the projection point of the installation position of a single laser rangefinder (9) onto the xOy plane. Y represents the y-direction component of the projection point of the installation position of a single laser rangefinder (9) onto the xOy plane. Z represents the installation height of a single laser rangefinder (9). α represents the angle between the line connecting the projection point of a single laser rangefinder (9) on the xOy plane and the rotation center point of the standard stirring frame (3) and the x-axis. D represents the outer diameter of the standard stirring frame (3). L represents the height of the standard stirring frame (3); The value of the x-direction component X of the installation position of the single laser rangefinder (9) on the xOy plane projection point is determined according to the outer contour diameter D of the standard stirring frame (3) and the angle α between the line connecting the installation position of the single laser rangefinder (9) on the xOy plane projection point and the rotation center point of the standard stirring frame (3) and the x-axis. S4. The specific arrangement position of a single laser rangefinder (9) on the outer contour line of the first stirring leg of the standard stirring frame (3) is calculated according to formula (1); S5. Install a laser rangefinder (9) on the outer contour line of the second stirring leg of the standard stirring frame (3). The laser rangefinder (9) on the first stirring leg and the second stirring leg are arranged symmetrically to meet the ranging requirements. S6. Based on the size parameters of the mixer to be installed with the mixing frame (2) and the installation environment, determine the layout of each gear in the gearbox (1); S7. Design complete.

2. The design method of the stirring frame gap detection fixture as described in claim 1, characterized in that: The design dimensions of the stirring frame (2) to be tested are the same as those of the standard stirring frame (3).

3. The design method of the stirring frame gap detection fixture as described in claim 1, characterized in that: An encoder disk (8) is installed on the output shaft of the gearbox (1) connected to the standard stirring frame (3). A position pulse sensor (7) is installed on the standard stirring frame (3). The position pulse sensor (7) and the encoder disk (8) are both connected to the micro PC (4) through the signal acquisition card (6).

4. The design method of the stirring frame gap detection fixture as described in claim 3, characterized in that: The micro PC (4) is electrically connected to the UPS power supply (5).

5. The design method of the stirring frame gap detection fixture as described in claim 3, characterized in that: In S4, the real-time rotation angle of the standard stirring frame (3) is tracked by the encoder disk (8) and the position pulse sensor (7).

6. The design method of the stirring frame gap detection fixture as described in claim 1, characterized in that: The external fitting of the mixing frame gap detection fixture is equipped with a standard mixing barrel. The standard mixing barrel is the same size as the mixing barrel inside the mixer to be installed with the mixing frame (2) to be tested. At this time, the laser distance sensor (9) installed on the connecting rod of the standard mixing frame (3) can detect the gap distance between the standard mixing frame (3) and the bottom wall of the standard mixing barrel. The laser distance sensor (9) installed on the mixing leg of the standard mixing frame (3) can detect the gap distance between the standard mixing frame (3) and the inner side wall of the standard mixing barrel.

7. A tooling for detecting the gap of a stirring frame designed using the design method described in claim 1, characterized in that: A standard stirring frame (3) with three laser rangefinders (9) arranged on a single stirring leg is used. When the angle α between the line connecting the projection point of a single laser rangefinder (9) on the xOy plane and the rotation center point of the standard stirring frame (3) and the x-axis is 25°, 45° and 65° respectively, the corresponding arrangement positions of the laser rangefinders (9) on the first stirring leg are P[X, 0.4663(D / 2-X), Z], P[X, (D / 2-X), Z] and P[X, 2.1445(D / 2-X), Z]. The value of the x-direction component X of the installation position of the single laser rangefinder (9) on the xOy plane projection point is determined according to the outer contour diameter D of the standard stirring frame (3) and the angle α between the line connecting the installation position of the single laser rangefinder (9) on the xOy plane projection point and the rotation center point of the standard stirring frame (3) and the x-axis. The standard stirring frame (3) is connected to one output shaft of the gearbox (1). The gearbox (1) has the following structure: it includes a casing (101) with an open top, and a cover plate (109) is installed at the open top. The chassis (101) has several first through holes (111) in its opening, and the end face of the cover plate (109) has several second through holes (112) corresponding to the first through holes (111). A single rotating shaft is installed in both the single second through hole (112) and the corresponding first through hole (111). The rotating shaft includes a central shaft (102) as an input shaft, and a first stirring shaft group and a second stirring shaft group as output shafts. The first stirring shaft group includes a first stirring shaft (103) symmetrically arranged along the central shaft (102), and the second stirring shaft group includes a second stirring shaft (104) symmetrically arranged along the central shaft (102). A first central gear (105) and a second central gear (106) are sequentially mounted on the shaft of the central shaft (102). The pitch circle diameter of the second central gear (106) is larger than that of the first central gear (105). The first central gear (105) meshes with a first planetary gear set. The first planetary gear set includes a first planetary gear (107) respectively mounted on the shaft of the first stirring shaft (103). The second central gear (106) meshes with a second planetary gear set. The second planetary gear set includes a second planetary gear (108) respectively mounted on the shaft of the second stirring shaft (104).

8. The tooling for detecting the gap in a stirring frame as described in claim 7, characterized in that: Each of the first through hole (111) and the second through hole (112) is fitted with a cover (110), and the cover (110) has a third through hole (113) for extending the rotating shaft out of the gearbox (1).

9. The tooling for detecting the gap in a stirring frame as described in claim 7, characterized in that: Several leveling feet (114) are fitted on the outer bottom wall of the chassis (101).

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