Dimension detection equipment for casting perforation processing

Abstract

The invention discloses size detection equipment for casting perforation processing, and relates to the technical field of size measurement. The device comprises a base, a supporting plate and a displacement assembly. The detection part goes deep into a workpiece hole through the contact ball, and the laser emitter and the light sensor are used for detecting the contact position, thereby realizing high-precision size measurement. The displacement assembly adopts the design of a negative pressure rotating cylinder and a resistance sliding rod, adjusts the displacement of a contact ball according to the rotating speed, and flexibly adapts to different hole requirements. Through the control of the planetary gear and the electromagnet, the contact ball can rotate to realize multi-angle detection. The detection table is driven by a central electric cylinder and an edge inclination control electric cylinder to stably adjust the posture of a workpiece. The device is high in automation degree and convenient to operate, and overcomes the defects of low precision, poor efficiency and single-direction detection of traditional manual measurement.

Description

Technical Field

[0001] The invention relates to the technical field of dimension measurement, in particular to a dimension detection device for casting perforation processing. Background Art

[0002] Existing dimensional detection technologies for casting perforation processing mostly rely on manual measuring tools (such as vernier calipers, plug gauges) or simple mechanical detection devices. These traditional methods usually require operators to measure the hole sizes one by one with handheld tools, or perform single-direction detection through fixed probes. However, these technologies have significant disadvantages: First, the accuracy of manual measurement is limited by the operator's experience and attention, and errors are prone to occur, especially when complex holes or large-scale inspections are inefficient. In addition, most of the probes of current inspection equipment use mechanical contact, which will make it difficult to achieve multi-angle and all-round precision inspections. There are defects such as incoordination between workpiece positioning and measurement feedback and difficulty in automated operation, which limits its application effect in high-demand casting inspections. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a size detection device for casting perforation processing, comprising a base, on which a top support plate and a bottom support plate are fixedly installed in the air through a plurality of support columns, a displacement assembly is arranged between the top support plate and the bottom support plate, and the displacement assembly is used to drive the detection part to move, wherein the detection part comprises a light-shielding tube, and a conductive sliding block and a movable ball head mounting plate are fixedly installed at the bottom and top ends of the light-shielding tube respectively, wherein a light sensor is fixedly installed at one side of the conductive sliding block located inside the light-shielding tube through the light-shielding plate, a circular through hole with the same diameter as the light sensor and the light-shielding plate are provided at the center positions of the circles, a movable ball head is movably installed on the movable ball head mounting plate through a ball pair connection method, a contact ball is fixedly installed on the movable ball head through a contact ball support rod, a reflective lens is fixedly installed at the position of the movable ball head located inside the light-shielding tube, the reflective lens and the contact ball support rod are coaxially matched, a laser emitter is embedded and installed at the axial center position of the conductive sliding block, and the light emitted by the laser emitter is irradiated onto the reflective lens through the light sensor and the circular through hole of the light-shielding plate.

[0004] Preferably, the contact ball support rod and the contact ball are in a fixed fit, and the contact ball support rod and the movable ball head are in a fixed fit that is easy to disassemble. The conductive sliding block is slidably arranged on the displacement assembly.

[0005] Preferably, the displacement assembly includes two parallel arranged resistance sliding rods, wherein the conductive sliding block is slidably matched with the resistance sliding rod, the resistance sliding rod is fixedly mounted on the resistance sliding rod bracket, the resistance sliding rod bracket is fixedly mounted on the tube axis bracket, an actuator piston tube is also fixedly mounted on the resistance sliding rod bracket, an actuator piston block is provided with an actuator piston block inside the actuator piston tube for sliding sealing, the actuator piston block and the conductive sliding block are fixedly matched through a first force transmission rod and a second force transmission rod, wherein the first force transmission rod and the second force transmission rod form a U-shaped frame.

[0006] Preferably, a reset spring is arranged around the outer surface of the first force transmission rod at a position inside the actuator piston tube, and both ends of the reset spring are fixedly matched with the actuator piston block and the end of the actuator piston tube; the other end of the actuator piston tube is fixedly connected with a pressure delivery pipe, and the end of the pressure delivery pipe away from the actuator piston tube is fixed to the tube shaft bracket, and a tube shaft that rotates with the top support plate is also fixedly installed on the tube shaft bracket, and the tube shaft is connected to the inside of the pressure delivery pipe.

[0007] Preferably, two concentrically arranged center gear rings and edge gear rings are rotatably mounted on the bottom support plate, and the center gear rings and edge gear rings are meshed and transmitted via two planetary gears. The two planetary gears are rotatably mounted on a planetary gear bracket, and the planetary gear bracket is rotatably mounted on the top support plate. An annular electromagnet is also fixedly mounted on one side of the top support plate facing the bottom support plate, and the annular electromagnet is rotatably sleeved on the outer surface of the planetary gear bracket, and the planetary gear bracket and the annular electromagnet cooperate with each other magnetically.

[0008] Preferably, a gearbox is fixedly installed on the top support plate, a driving gear is fixedly installed on the input shaft of the gearbox, the driving gear is meshed with the center gear ring for transmission, a friction resistance sleeve is fixedly installed at the center position of the circle on the upper surface of the top support plate, the top end of the tube shaft passes through the friction resistance sleeve, the friction resistance sleeve is used to squeeze the tube shaft, increase the resistance of the tube shaft to rotate on the top support plate, and the output shaft of the gearbox is connected to the tube shaft through a third transmission belt.

[0009] Preferably, a negative pressure rotating support disk is rotatably mounted on the upper surface of the top support plate and is concentrically arranged with the top support plate itself; a negative pressure rotating cylinder and a counterweight are fixedly mounted on the negative pressure rotating support disk; a rotating seal is formed between the negative pressure rotating cylinder and the tube axis, and a counterweight negative pressure sealing piston is provided for the sliding seal inside the negative pressure rotating cylinder.

[0010] Preferably, a central electric cylinder is fixedly installed at the center position of the base, and a plurality of edge tilt control electric cylinders are arranged in a circular equidistant array outside the central electric cylinder. All edge tilt control electric cylinders are fixedly installed on the base, and the ends of the telescopic rods of the central electric cylinder are connected to the detection platform through a ball head connecting head and a ball pair, and the ends of the telescopic rods of all edge tilt control electric cylinders are in contact and cooperate with the detection platform; a plurality of hooks are also provided on the upper surface of the detection platform.

[0011] Preferably, a driving motor is also fixedly mounted on the top support plate, and the output shaft of the driving motor is transmission-connected to the negative pressure rotating bracket disk through a first transmission belt, and the output shaft of the driving motor is transmission-connected to the edge gear ring through a second transmission belt.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can accurately detect the size of the hole in the casting through the coordinated work of the laser emitter, the light sensor and the reflective lens. When the contact ball contacts the workpiece, the reflective lens tilts, causing the light to shift. The light sensor captures this change, thereby accurately determining the position of the contact ball. Through multiple contact measurements, high-precision data of the hole size can be obtained, avoiding the influence of human errors in traditional manual measurement, and is particularly suitable for the detection of castings with complex geometric shapes; and compared with the traditional mechanical contact method, it is not only simple in structure, but also can achieve multi-angle and all-round detection; (2) The displacement assembly of the present invention adopts a unique design of a negative pressure rotating cylinder and an actuator piston tube to adjust the displacement distance of the conductive sliding block on the resistance sliding rod by changing the speed. The higher the speed, the stronger the negative pressure, and the greater the tension to overcome the reset tension spring, thereby achieving flexible adjustment of the contact ball position; (3) The annular electromagnet of the present invention controls the rotation of the planetary gear bracket. Combined with the transmission of the center gear ring and the gearbox, the equipment can drive the contact ball to rotate around the axis of the top support plate to achieve multi-angle detection. The angle sensor further monitors the rotation angle to ensure that the detection process is controllable. This design overcomes the limitation of single-direction detection of traditional devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the structure of the ball joint of the present invention.

[0015] Figure 3 It is a structural schematic diagram of the negative pressure rotating cylinder of the present invention.

[0016] Figure 4 It is a schematic diagram of the structure of the center gear ring of the present invention.

[0017] Figure 5 It is a schematic diagram of the structure at the pipe axis of the present invention.

[0018] Figure 6 This is a schematic diagram of the piston tube structure of the present invention.

[0019] Figure 7 It is a schematic diagram of the internal structure of the light-shielding tube of the present invention.

[0020] In the figure: 101 - support column; 102 - base; 103 - inspection table; 104 - top support plate; 105 - bottom support plate; 106 - hook; 107 - edge tilt control electric cylinder; 108 - central electric cylinder; 109 - ball head connector; 110 - drive motor; 111 - first transmission belt; 112 - second transmission belt; 113 - negative pressure rotating support disc; 114 - counterweight; 115 - negative pressure rotating cylinder; 116 - counterweight negative pressure sealing piston; 117 - pipe shaft; 118 - friction resistance sleeve; 119 - third transmission belt; 120 - gearbox; 121 - planetary gear support; 122 - annular electromagnet; 123 - drive gear; 124 - central gear ring; 125 - planetary gear; 126 - edge gear ring; 127 - pipe shaft support; 128 - pressure delivery pipe; 129 - actuator piston pipe; 130 - resistance sliding rod; 131 - resistance sliding rod support; 132 - return tension spring; 133 - first force transmission rod; 134 - actuator piston block; 135 - conductive sliding block; 136 - light-shielding cylinder; 137 - contact ball support rod; 138 - contact ball; 139 - second force transmission rod; 140 - laser emitter; 141 - light sensor; 142 - light-shielding plate; 143 - reflecting lens; 144 - movable ball head; 145 - movable ball head mounting plate. Detailed implementation manners

[0021] The following combines the attached Figures 1-7 , and further illustrates the technical solution of the present invention through specific implementation manners.

[0022] The present invention provides a size detection device for perforating castings, which includes a base 102. A top support plate 104 and a bottom support plate 105 are fixedly installed above the base 102 in a suspended manner through a plurality of support columns 101. A displacement assembly is arranged between the top support plate 104 and the bottom support plate 105, and the displacement assembly is used to drive the detection part to move. The detection part includes a light-shielding cylinder 136. A conductive sliding block 135 and a movable ball head mounting plate 145 are fixedly installed at the bottom end and the top end of the light-shielding cylinder 136 respectively. A light sensor 141 is fixedly installed on the side of the conductive sliding block 135 located inside the light-shielding cylinder 136 through a light-shielding plate 142. Circular through holes with the same diameter are opened at the center positions of the light sensor 141 and the light-shielding plate 142. A movable ball head 144 is movably installed on the movable ball head mounting plate 145 by means of a ball pair connection. A contact ball 138 is fixedly installed on the movable ball head 144 through a contact ball support rod 137. A reflecting lens 143 is fixedly installed at the position of the movable ball head 144 located inside the light-shielding cylinder 136. The reflecting lens 143 is coaxially matched with the contact ball support rod 137. A laser emitter 140 is embedded at the axial center position of the conductive sliding block 135. The light emitted by the laser emitter 140 irradiates the reflecting lens 143 through the circular through holes of the light sensor 141 and the light-shielding plate 142. A fixed matching method is adopted between the contact ball support rod 137 and the contact ball 138, and a detachable fixed matching method is adopted between the contact ball support rod 137 and the movable ball head 144. The conductive sliding block 135 is slidably arranged on the displacement assembly.

[0023] The displacement assembly includes two resistive sliding rods 130 arranged in parallel. The conductive sliding block 135 is slidably engaged with the resistive sliding rod 130. The resistive sliding rod 130 is fixedly installed on the resistive sliding rod bracket 131, and the resistive sliding rod bracket 131 is fixedly installed on the tube shaft bracket 127. An actuating piston tube 129 is also fixedly installed on the resistive sliding rod bracket 131. An actuating piston block 134 is slidably and sealingly arranged inside the actuating piston tube 129. The actuating piston block 134 and the conductive sliding block 135 are fixedly cooperated through a first force transmission rod 133 and a second force transmission rod 139. The first force transmission rod 133 and the second force transmission rod 139 form a U-shaped frame. A return spring 132 is arranged around the outer surface of the first force transmission rod 133 at the position inside the actuating piston tube 129. The two ends of the return spring 132 are fixedly cooperated with the actuating piston block 134 and the end of the actuating piston tube 129. The other end of the actuating piston tube 129 is fixedly and communicatively arranged with a pressure delivery tube 128. One end of the pressure delivery tube 128 away from the actuating piston tube 129 is fixed to the tube shaft bracket 127. A tube shaft 117 rotatably engaged with the top support plate 104 is also fixedly installed on the tube shaft bracket 127. The tube shaft 117 is communicatively arranged with the inside of the pressure delivery tube 128. Two concentrically arranged central gear rings 124 and edge gear rings 126 are rotatably installed on the bottom support plate 105. The central gear ring 124 and the edge gear ring 126 are meshed and driven by two planetary gears 125. The two planetary gears 125 are rotatably arranged on the planetary gear bracket 121, and the planetary gear bracket 121 is rotatably installed on the top support plate 104. An annular electromagnet 122 is also fixedly installed on the side of the top support plate 104 facing the bottom support plate 105. The annular electromagnet 122 is rotatably sleeved on the outer surface of the planetary gear bracket 121, and there is a magnetic cooperation between the planetary gear bracket 121 and the annular electromagnet 122.

[0024] A transmission 120 is fixedly installed on the top support plate 104. A driving gear 123 is fixedly installed on the input shaft of the transmission 120. The driving gear 123 is in meshing transmission with the central gear ring 124. A friction resistance sleeve 118 is fixedly installed at the center position of the upper surface of the top support plate 104. The top end of the pipe shaft 117 passes through the friction resistance sleeve 118. The friction resistance sleeve 118 is used to squeeze the pipe shaft 117 to increase the resistance of the pipe shaft 117 to rotate on the top support plate 104. The output shaft of the transmission 120 is in transmission connection with the pipe shaft 117 through a third transmission belt 119. A negative pressure rotary support disc 113 concentric with the top support plate 104 itself is rotatably installed on the upper surface of the top support plate 104. A negative pressure rotary cylinder 115 and a counterweight 114 are fixedly installed on the negative pressure rotary support disc 113. The negative pressure rotary cylinder 115 is in rotary sealing fit with the pipe shaft 117, and a counterweight negative pressure sealing piston 116 is slidably and sealingly arranged inside the negative pressure rotary cylinder 115. A central electric cylinder 108 is fixedly installed at the center position of the base 102. A plurality of edge inclined control electric cylinders 107 are arranged in a circular equidistant array outside the central electric cylinder 108. All the edge inclined control electric cylinders 107 are fixedly installed on the base 102. The end of the telescopic rod of the central electric cylinder 108 is ball-joint connected to a detection table 103 through a ball head connector 109. The end of the telescopic rod of all the edge inclined control electric cylinders 107 is in contact fit with the detection table 103. A plurality of hooks 106 are further arranged on the upper surface of the detection table 103. A driving motor 110 is also fixedly installed on the top support plate 104. The output shaft of the driving motor 110 is in transmission connection with the negative pressure rotary support disc 113 through a first transmission belt 111, and the output shaft of the driving motor 110 is in transmission connection with an edge gear ring 126 through a second transmission belt 112.

[0025] The working principle of a dimensional inspection device for perforating castings disclosed in the present invention is as follows: Place the workpiece to be inspected on the inspection table 103, and then use a strap to fix the workpiece to the inspection table 103 through the hook 106 to prevent loosening during inspection. By controlling all the edge tilt control electric cylinders 107 and the central electric cylinder 108, the vertical height of the workpiece on the base 102 can be raised, that is, the distance between the workpiece and the contact ball 138 can be adjusted (or by the cooperation of multiple edge tilt control electric cylinders 107, the tilt angle of the upper surface of the inspection table 103 can be controlled, that is, the tilt angle of the workpiece can be controlled, so that the contact ball 138 can penetrate into the holes of the workpiece). The purpose is to insert the contact ball 138 into the holes of the workpiece. Subsequently, start the drive motor 110. The output shaft of the drive motor 110 drives the negative pressure rotating support disk 113 and the edge gear ring 126 to rotate together through the first transmission belt 111 and the second transmission belt 112 (the rotation speeds are different, but they rotate independently). The rotation of the edge gear ring 126 will drive the planetary gear 125 to rotate self and revolve, because the rotation of the central gear ring 124 needs to overcome the frictional resistance in the transmission path from the drive gear 123 to the tube shaft 117 (including the frictional resistance with the friction resistance sleeve 118). Therefore, all the power will not be transmitted to the central gear ring 124, but to the planetary gear 125, resulting in the inability of the central gear ring 124 to rotate. At the same time, the planetary gear 125 will rotate self and revolve. At this time, the rotation of the edge gear ring 126 cannot drive the tube shaft 117 to rotate, but the negative pressure rotating cylinder 115 on the negative pressure rotating support disk 113 also rotates simultaneously with the edge gear ring 126 (the counterweight 114 is used for counterweight. The larger the diameter of the negative pressure rotating cylinder 115, the better the dynamic balance of the overall rotation). The rotation of the negative pressure rotating cylinder 115 will cause the internal counterweight negative pressure sealing piston 116 to slide outwards under the centrifugal force, which will cause the pressure inside the negative pressure rotating cylinder 115 to decrease. Then, through the tube shaft 117 and the pressure delivery tube 128, the pressure inside the actuating piston tube 129 will decrease. At this time, under the external pressure difference, the atmosphere will squeeze the actuating piston block 134 to slide deep into the actuating piston tube 129. At this time, the reset tension spring 132 will be stretched. The actuating piston block 134 drives the conductive sliding block 135 to slide on the resistance sliding rod 130 through the first force transmission rod 133 and the second force transmission rod 139. Therefore, the faster the rotation speeds of the negative pressure rotating cylinder 115 and the negative pressure rotating support disk 113, the stronger the negative pressure inside the negative pressure rotating cylinder 115, and more force is available to overcome the tension of the reset tension spring 132, thereby increasing the displacement of the actuating piston block 134 inside the actuating piston tube 129, and further adjusting the sliding distance of the conductive sliding block 135 on the resistance sliding rod 130 (the sliding of the resistance sliding rod 130 and the conductive sliding block 135 is a resistance fit. The resistance value of the circuit formed between one end of the resistance sliding rod 130 and the conductive sliding block 135 is used to determine the specific displacement size), so as to control the horizontal movement of the contact ball 138.

[0026] When it is necessary to rotate the contact ball 138, the annular electromagnet 122 is activated, and the magnetic force of the annular electromagnet 122 is controlled. The annular electromagnet 122 generates a magnetic force to restrict the rotation of the planetary gear support 121. After the planetary gear support 121 is restricted by the magnetic force, the revolution of the planetary gear 125 will be affected (it should be noted that the annular electromagnet 122 only has a magnetic force cooperation relationship with the restricted planetary gear support 121). Therefore, part of the power will be transmitted to the central gear ring 124 to overcome the resistance of the central gear ring 124 to rotate. When the central gear ring 124 rotates, it will drive the drive gear 123 to rotate. The rotation of the drive gear 123 will drive the input shaft of the transmission 120 to rotate, and the output shaft of the transmission 120 will drive the pipe shaft 117 to rotate through the third transmission belt 119 (the transmission 120 is used to reduce the rotational speed of the power transmitted from the drive gear 123 to the pipe shaft 117). The rotation of the pipe shaft 117 will drive the resistance slider support 131 to rotate through the pipe shaft support 127, thereby driving the entire resistance slider 130 to rotate. At this time, the contact ball 138 can rotate (rotate around the axis of the top support plate 104). An angle sensor is provided at the position of the friction resistance sleeve 118 and the pipe shaft 117 to detect the rotation angle of the pipe shaft 117 (the rotation angle of the contact ball 138).

[0027] When the contact ball 138 moves into contact with the workpiece, it will cause the contact ball support rod 137 to tilt, resulting in movement between the movable ball head 144 and the movable ball head mounting plate 145. The reflecting lens 143 will tilt (no longer horizontal). At this time, the angle between the light emitted by the laser emitter 140 and the reflecting lens 143 is no longer in a vertical state. Therefore, the light reflected by the reflecting lens 143 cannot be reflected back to the laser emitter 140 along the original path, but will be deflected. This deflected light will irradiate on the light sensor 141. Therefore, when the light sensor 141 detects a change in light, it can be determined that the contact ball 138 is in contact with the workpiece, so as to determine the current position of the contact ball 138. By contacting the workpiece multiple times, the hole size information of the workpiece can be obtained.

Claims

1. A dimensional inspection device for perforating castings, characterized in that: It includes a base (102). On the base (102), a top support plate (104) and a bottom support plate (105) are fixedly installed overhead through a plurality of support columns (101). A displacement component is arranged between the top support plate (104) and the bottom support plate (105). The displacement component is used to drive the detection part to move. The detection part includes a light-shielding cylinder (136). A conductive sliding block (135) and a movable ball head mounting plate (145) are fixedly installed at the bottom end and the top end of the light-shielding cylinder (136) respectively. On the side of the conductive sliding block (135) located inside the light-shielding cylinder (136), a light sensor (141) is fixedly installed through a light-shielding plate (142). Circular through holes with the same diameter are opened at the center positions of the light sensor (141) and the light-shielding plate (142). A movable ball head (144) is movably installed on the movable ball head mounting plate (145) by means of a ball pair connection. A contact ball (138) is fixedly installed on the movable ball head (144) through a contact ball support rod (137). A reflecting lens (143) is fixedly installed at the position of the movable ball head (144) located inside the light-shielding cylinder (136). The reflecting lens (143) is coaxially matched with the contact ball support rod (137). A laser emitter (140) is embedded at the axial center position of the conductive sliding block (135). The light emitted by the laser emitter (140) irradiates the reflecting lens (143) through the circular through holes of the light sensor (141) and the light-shielding plate (142).

2. The dimensional inspection device for casting perforation processing according to claim 1, wherein: A fixed matching method is adopted between the contact ball support rod (137) and the contact ball (138), and a fixed matching method that is convenient for disassembly is adopted between the contact ball support rod (137) and the movable ball head (144). The conductive sliding block (135) is slidably arranged on the displacement component.

3. The dimensional inspection device for casting perforation processing according to claim 2, characterized in that: The displacement component includes two parallel resistance sliding rods (130). The conductive sliding block (135) is slidably matched with the resistance sliding rods (130). The resistance sliding rods (130) are fixedly installed on a resistance sliding rod bracket (131). The resistance sliding rod bracket (131) is fixedly installed on a tube shaft bracket (127). An actuator piston tube (129) is also fixedly installed on the resistance sliding rod bracket (131). An actuator piston block (134) is slidably and sealingly arranged inside the actuator piston tube (129). The actuator piston block (134) and the conductive sliding block (135) are fixedly matched through a first transmission rod (133) and a second transmission rod (139). The first transmission rod (133) and the second transmission rod (139) form a U-shaped frame.

4. A dimension detection device for casting perforation processing according to claim 3, characterized in that: The outer surface of the first force transmission rod (133) is located inside the actuator piston tube (129) and is surrounded by a return spring (132). The two ends of the return spring (132) are fixedly matched with the actuator piston block (134) and the end of the actuator piston tube (129). The other end of the actuator piston tube (129) is fixedly connected with a pressure delivery tube (128). The end of the pressure delivery tube (128) away from the actuator piston tube (129) is fixed to a tube shaft bracket (127). A tube shaft (117) that is rotatably matched with the top support plate (104) is also fixedly installed on the tube shaft bracket (127). The tube shaft (117) is connected to the inside of the pressure delivery tube (128).

5. The dimensional inspection device for perforating a casting according to claim 4, wherein: Two concentrically arranged center gear rings (124) and edge gear rings (126) are rotatably mounted on the bottom support plate (105); the center gear rings (124) and edge gear rings (126) are meshed and driven by two planetary gears (125); the two planetary gears (125) are rotatably mounted on a planetary gear bracket (121); the planetary gear bracket (121) is rotatably mounted on the top support plate (104); an annular electromagnet (122) is fixedly mounted on one side of the top support plate (104) facing the bottom support plate (105); the annular electromagnet (122) is rotatably sleeved on the outer surface of the planetary gear bracket (121); and magnetic force cooperates between the planetary gear bracket (121) and the annular electromagnet (122).

6. The dimension detection device for casting perforation processing according to claim 5, characterized in that: A gearbox (120) is fixedly mounted on the top support plate (104), a driving gear (123) is fixedly mounted on the input shaft of the gearbox (120), the driving gear (123) is meshed with the center gear ring (124) for transmission, a friction resistance sleeve (118) is fixedly mounted at the center of the circle on the upper surface of the top support plate (104), wherein the top end of the tube shaft (117) passes through the friction resistance sleeve (118), the friction resistance sleeve (118) is used to squeeze the tube shaft (117) to increase the resistance of the tube shaft (117) to rotation on the top support plate (104), and the output shaft of the gearbox (120) is connected to the tube shaft (117) through a third transmission belt (119).

7. The dimension detection device for casting perforation processing according to claim 6, wherein: A negative pressure rotating support disc (113) is rotatably mounted on the upper surface of the top support plate (104) and is arranged concentrically with the top support plate (104). A negative pressure rotating cylinder (115) and a counterweight (114) are fixedly mounted on the negative pressure rotating support disc (113). A rotating seal cooperates between the negative pressure rotating cylinder (115) and the tube shaft (117), and a counterweight negative pressure sealing piston (116) is provided in the negative pressure rotating cylinder (115) as a sliding seal.

8. An apparatus for dimension inspection in the perforation machining of a casting, as claimed in claim 7, wherein: A central electric cylinder (108) is fixedly mounted at the center of a circle of the base (102); a plurality of edge tilt control electric cylinders (107) are arranged in a circular equidistant array outside the central electric cylinder (108); all edge tilt control electric cylinders (107) are fixedly mounted on the base (102); an end of a telescopic rod of the central electric cylinder (108) is connected to a detection platform (103) via a ball joint (109); and the ends of the telescopic rods of all edge tilt control electric cylinders (107) are in contact with and fit the detection platform (103); and a plurality of hooks (106) are also arranged on the upper surface of the detection platform (103).

9. The dimension detection device for casting perforation processing according to claim 8, characterized in that: A driving motor (110) is also fixedly mounted on the top support plate (104); the output shaft of the driving motor (110) is drivingly connected to the negative pressure rotating support plate (113) via a first driving belt (111); and the output shaft of the driving motor (110) is drivingly connected to the edge gear ring (126) via a second driving belt (112).

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