An offline measurement and correction system for assembling workpieces and its use method

Abstract

The invention relates to an offline measurement and correction system for assembling workpieces in the technical field of clamping tool installation and alignment, and a method for using the system. The system comprises a testing table, a movable bracket, a zero-point clamping base, an angular detection mechanism, a calibration rod and an electrode, wherein the lower end of the calibration rod is clamped and adapted to the zero-point clamping base; the zero-point clamping base is mounted on one end of the upper table of the testing table, and an angle fine-tuning mechanism is connected between the zero-point clamping base and the tail end of the electrode; the angular detection mechanism is mounted on the outside of one side of the zero-point clamping base; a lifting mechanism is mounted on the other end of the upper table of the testing table, and the upper surface of the movable bracket is provided with distance sensors in the X and Y directions corresponding to the electrode head end, and the distance sensor signals are connected to an analysis and control device; the invention discloses an error prevention, monitoring, measurement and correction system that can meet the requirements of online and offline matching, improves the production efficiency of the entire electrode processing process, and ensures that the processing quality of product parts is accurate, stable and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of clamping tool installation and alignment, and in particular to an offline measurement and correction system for assembling workpieces and a use method thereof. Background Art

[0002] For machining tools that require frequent clamping and assembly, each assembly, correction, and adjustment on the equipment consumes a significant amount of time and effort. For example, the fuel regulator is a critical component on a certain aircraft model, and the EDM internal cavity machining of its main housing parts is a key machining process. Each set of products requires eight different electrode specifications, which need to be frequently changed. The single-piece machining cycle takes eight hours, forcing production to arrange shifts to meet production demands.

[0003] EDM is a specialized process requiring fewer operators. The machining of housing parts requires proficiency in machining techniques. Although a 3R zero-point quick-change system is currently in use, each electrode still needs to be aligned relative to the machine tool before its first use. A slight mistake can render the entire housing part scrapped. Eight electrodes need to be replaced and aligned eight times. Each time the electrode head is updated, it needs to be re-aligned (readjusting the corresponding zero point). This alignment time often exceeds the actual machining time. Furthermore, the electrode head is a consumable part that requires frequent replacement. The alignment and switching of multiple electrodes determine the quality and efficiency of the EDM process.

[0004] The EDM equipment currently in use is a three-axis system. Its electrode alignment method mainly uses a precision knife-edge square or a dial indicator. The dial indicator alignment is to install a dial indicator head on the spindle chuck and use manual operation to move it unidirectionally along the X / Y / Z axis. The jump of the indicator is observed to determine whether the electrode (or part) is in the correct position. Regardless of the method, it is online alignment on the EDM equipment. This process mostly requires manual fine-tuning, which takes a long time. The operator is easily fatigued by frequent bending and tilting of the head, resulting in low alignment efficiency and difficulty in meeting production needs. Summary of the Invention

[0005] In order to overcome the deficiencies in the background technology, the present invention discloses an error prevention, monitoring, measurement and correction system that can meet the needs of online and offline matching, thereby improving the production efficiency of the entire processing process and ensuring that the processing quality of product parts is accurate, stable and reliable.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0007] The invention relates to an offline measurement and correction system for assembled workpieces, comprising a detection platform, a movable bracket, a zero-point clamping base, an angular detection mechanism, a calibration rod and an electrode erected on the zero-point clamping base along the Z direction, wherein the lower end of the calibration rod is clamped and adapted to the zero-point clamping base, and the upper end of the calibration rod is configured as a square step structure; the zero-point clamping base is mounted on one end of the upper table of the detection platform, an angle fine-tuning mechanism is connected between the zero-point clamping base and the tail end of the electrode, the angle fine-tuning mechanism is used to adjust the vertical deflection angle between the electrode and the clamping horizontal plane; the angular detection mechanism is mounted outside one side of the zero-point clamping base and is used to detect and determine the deflection direction of the electrode; a lifting mechanism for controlling the vertical lifting of the movable bracket is mounted on the other end of the upper table of the detection platform, and a distance measuring sensor is provided on the upper surface of the movable bracket in the X direction and the Y direction corresponding to the electrode head end, and the distance measuring sensor signal is connected to an analysis and control device for analyzing and processing measurement data.

[0008] Furthermore, the angular detection mechanism includes a dial indicator, a meter stand rod and an angular slide rail along the axial direction of the detection platform. The angular slide rail is installed on the outside of one side of the zero point clamping base. The bottom end of the meter stand rod is clamped with the angular slide rail and can be moved and positioned along the angular slide rail. The tail end of the dial indicator is installed on the top end of the meter stand rod, and the measuring head end of the dial indicator corresponds to the head end of the electrode.

[0009] Furthermore, the angle fine-tuning mechanism includes a bottom column seat, an adjusting middle column, a positioning core column and an adjusting upper column. The lower end of the bottom column seat is clamped and adapted to the zero-point clamping base. A first groove is provided in the center of the upper end face of the bottom column seat. The groove wall of the first groove is evenly ringed with four first screw holes equipped with a first screw. The groove bottom surface of the first groove is evenly ringed with multiple second screw holes. A first protrusion is provided in the center of the lower end face of the adjusting middle column with a gap inserted into the first groove. An adjusting through hole with a diameter larger than the second screw hole aperture is provided on the lower end face of the first protrusion corresponding to the second screw hole. Four third screw holes are evenly ringed on the outer edge of the upper end face of the adjusting middle column. The screw thread of the adjusting screw thread is fixed on the upper end face of the adjusting column, and the screw thread of the adjusting screw thread is fixed on the lower ... upper end face of the adjusting column, and the screw thread of the adjusting screw thread is fixed on the upper end face of the adjusting column, and the screw thread of the adjusting screw thread is fixed on the upper end face of the adjusting column, and the screw thread of the adjusting screw

[0010] Furthermore, a clip assembly for quickly clamping the tail end of the electrode is installed in the center of the upper end surface of the adjusting upper column.

[0011] Furthermore, the lifting mechanism includes a lifting slide and two lifting slide rails that are spaced apart and stand side by side on the table top of the inspection table. The top ends of the two lifting slide rails are connected by a horizontal plate. A lifting screw is provided between the two lifting slide rails. The bottom end of the lifting screw is rotatably connected to the table top of the inspection table. The top end of the lifting screw rotates through the horizontal plate and is fixed with a rotating handle. The shaft of the lifting screw is equipped with a lifting nut. The outer wall of the lifting nut is fixed to the middle part of the inner plate surface of the lifting slide. Both sides of the outer plate surface of the lifting slide are respectively clamped on the two lifting slides and can move along the lifting slide. The movable bracket is fixed to the outer plate surface of the lifting slide.

[0012] Furthermore, the movable bracket is configured as an L-shaped or U-shaped support rod, and the two distance measuring sensors are respectively mounted on two mutually perpendicular support rod bodies.

[0013] Furthermore, the zero-point clamping base is detachably fixedly connected to the detection table through two hook-shaped pressure plates symmetrically arranged on both sides of the bottom, and a limit stopper is fixed on the detection table surface on the front side of the zero-point clamping base.

[0014] Furthermore, the zero-point clamping base is set as a 3R pneumatic zero-point fixture, an electric control box for controlling the opening and closing of the 3R pneumatic zero-point fixture is provided under the testing table, and a switch button is provided on the upper surface of the testing table.

[0015] Furthermore, the distance measuring sensor is set to be an infrared reflection distance measuring sensor.

[0016] A method for using an offline measurement and correction system for assembling a workpiece comprises the following steps:

[0017] Step 1: Determine the zero position of the distance sensor; clamp the lower end of the calibration rod to the zero point clamping base, adjust the lifting mechanism, use the distance sensor to measure the center position of the upper end of the calibration rod, and record the measured basic position data into the analysis and control device, and then remove the calibration rod;

[0018] Step 2: Preliminary measurement and clamping of the electrode: Fix the tail end of the electrode to the upper end of the angle fine-tuning mechanism, clamp the lower end of the angle fine-tuning mechanism to the zero-point clamping base, and preliminarily adjust the angle fine-tuning mechanism so that the electrode is in a nearly vertical state;

[0019] Step 3: Determine the theoretical spatial deviation data of the electrode; first, use the angular detection mechanism to measure the deflection angle of the electrode, then adjust the lifting mechanism so that the distance sensor can measure the distance to the electrode tip, obtain the final theoretical adjustment distance, and record it by the analysis and control device;

[0020] Step 4: The electrode is corrected into place; the angle fine-tuning mechanism is adjusted until the actual adjustment angle of the electrode meets the requirements, and the analysis and control device gives an adjustment signal;

[0021] Step 5. Remove the electrode with the angle fine-tuning mechanism and install it into the zero-point clamping base of the EDM equipment.

[0022] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects:

[0023] The present invention discloses an offline measurement and correction system for electrodes for electrospark equipment and a method for using the same. By means of a zero-point positioning system, the online alignment time of the equipment is transferred offline, so as to improve the efficiency of online electrospark machining. By means of the measurement and correction system and the universal zero-point clamping base of the electrospark equipment, and by accurately measuring the spatial distance, the synchronous position accuracy of the offline and online electrodes is ensured, so as to avoid the scrapping of parts due to improper electrode alignment or poor manufacturing accuracy. By means of the time division between online and offline electrodes, the replacement of electrode heads can be responded to quickly, so as to avoid waste caused by mistakes, and the utilization rate of equipment and production efficiency can be effectively improved, so as to break through the production bottleneck, meet the demand for increased processing output, and greatly increase the output value. In addition, the present invention is not limited to electrospark machining equipment, but can meet the offline calibration and installation of typical machining tools of various similar equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the implementation structure of the present invention;

[0025] Figure 2 is a structural schematic diagram of the angle fine-tuning mechanism;

[0026] Figure 3 Schematic diagram of the structure of the calibration rod.

[0027] In the figure: 1. Testing table; 2. Zero point clamping base; 3. Angle fine-tuning mechanism; 301. Bottom column seat; 302. First screw; 303. Adjusting middle column; 304. Positioning core column; 305. Center sphere; 306. Adjusting upper column; 307. Third screw; 4. Table stand rod; 5. Switch button; 6. Distance sensor; 7. Lifting mechanism; 8. Moving bracket; 9. Angular detection mechanism; 901. Dial indicator; 902. Table stand rod; 903. Angular slide rail; 10. Electric control box. DETAILED DESCRIPTION

[0028] The technical solutions of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" and the like indicating directions or positional relationships, these are merely for the purpose of corresponding to the drawings of the present invention and for the convenience of describing the present invention. They do not indicate or imply that the devices or components referred to must have a specific direction.

[0029] Combined with attachment Figure 1-3The electrode offline measurement and correction system for the electric spark equipment comprises a detection table 1, a movable bracket 8, a zero-point clamping base 2, an angular detection mechanism 9, a calibration rod, and an electrode 4 erected on the zero-point clamping base 2 along the Z direction. The electric spark equipment also has the same zero-point clamping base 2, ensuring that after the electrode is adjusted offline, it can be directly replaced and clamped online. The pneumatic zero-point quick change mechanism is used to achieve rapid switching of multiple sets of different tools (electrodes) while ensuring that the results after the change can be confirmed and effectively determined. The X, Y vertical cross zero-point positioning system (3R) is effective for measuring multiple electrode surfaces. It provides convenience. Zero point is the foundation. What is needed to achieve model change is a combination mechanism based on zero point. According to needs, the zero point clamping base 2 is set as a 3R pneumatic zero point fixture. An electric control box 10 for controlling the opening and closing of the 3R pneumatic zero point fixture is provided under the test bench 1. Components such as foot-operated pneumatic valves are used to open the internal mechanism of the pneumatic zero point base 13. Its basic principle is ventilation locking and air-off self-locking. It is safe, reliable and has extremely high precision. Theoretically, the repeat positioning accuracy is 0.003mm, which lays the foundation for offline measurement. A switch button 5 is provided on the upper surface of the test bench 1, which is convenient for the one-key startup and operation of the system.

[0030] The lower end of the calibration rod is clamped and adapted to the zero-point clamping base 2, and the upper end of the calibration rod is set as a square step structure, specifically a three-step square reference surface. By comparative measurement, the actual center position of the zero-point clamping base 2 can be easily found;

[0031] The zero-point clamping base 2 is installed at one end of the upper surface of the test bench 1. As needed, the zero-point clamping base 2 is detachably fixedly connected to the test bench 1 through two hook-shaped pressure plates symmetrically arranged on both sides of the bottom. A limit stop is fixed on the upper surface of the test bench 1 on the front side of the zero-point clamping base 2 to facilitate reliable connection and precise installation and positioning of the zero-point clamping base 2.

[0032] An angle fine-tuning mechanism 3 is connected between the zero-point clamping base 2 and the tail end of the electrode 4. The angle fine-tuning mechanism 3 is used to adjust the vertical deflection angle between the electrode 4 and the clamping horizontal plane. It can be used manually or automatically. In fact, when traditional EDM equipment adjusts the angle of the motor 4 online, it also has a similar angle fine-tuning device. This system can also use the same device; or a new angle fine-tuning mechanism 3 can be used as needed, which specifically includes a bottom column seat 301, an adjustment middle column 303, a positioning core column 304 and an adjustment upper column 306. The lower end of the bottom column seat 301 is clamped and adapted to the zero-point clamping base 2. The bottom column seat 301 A first groove is provided in the center of the upper end surface of the adjusting column 303, and four first screw holes are evenly arranged on the groove wall of the first groove, which are equipped with the first screw 302. A plurality of second screw holes are evenly arranged on the bottom surface of the first groove. A first protrusion is provided in the center of the lower end surface of the adjusting column 303 with a gap inserted into the first groove. An adjusting through hole with a diameter larger than the aperture of the second screw hole is provided on the lower end surface of the adjusting column 303 corresponding to the second screw hole. Four third screw holes are evenly arranged on the outer edge of the upper end surface of the adjusting column 303. A second groove is provided in the center of the upper end surface of the adjusting column 303, and the positioning core column 304 is inserted into the bottom of the second groove with a gap, and the outer edge of the upper end surface of the positioning core column 304 The edge is provided with a countersunk hole corresponding to the second screw hole for screwing into the second screw connection, a spherical arc groove is provided in the center of the upper end surface of the positioning core column 304, and a central sphere 305 is provided in the spherical arc groove. A second protrusion with a gap inserted into the second groove is provided in the center of the lower end surface of the adjustment upper column 306, and the lower end surface of the second protrusion is in contact with the central sphere 305. The outer edge of the upper end surface of the adjustment upper column 306 is provided with a connecting hole corresponding to the third screw hole for screwing into the third screw 307. The tail end of the electrode 4 is installed in the center of the upper end surface of the adjustment upper column 306, and the bottom column seat 301 of the angle fine-tuning mechanism 3 and the positioning core column 304 are connected by the second screw The connection is relatively fixed, and the bottom column seat 301 and the adjustment middle column 303 can be relatively adjusted by the first screw 302, and the adjustment middle column 303 and the adjustment upper column 306 can be relatively adjusted by the third screw 307. In this way, even if the electrode head is slightly eccentric, it can be corrected by using the universal support of the central sphere 305; In addition, a clip assembly for quickly clamping the tail end of the electrode 4 is installed in the center of the upper end surface of the adjustment upper column 306. The clip assembly can quickly clamp the electrode 4 using a spring, which is convenient for quick disassembly and assembly of the electrode 4. The clip assembly is an existing structure and will not be described in detail here.

[0033] The angular detection mechanism 9 is installed outside one side of the zero-point clamping base 2 and is used to detect and determine the deflection direction of the electrode 4; if only two sets of distance measuring sensors 6 in the X direction and the Y direction are used, angular misjudgment may occur. The addition of the angular detection mechanism 9 can achieve accurate measurement and fast and effective positioning of the zero-point base plate, thereby quickly establishing an effective spatial reference; the angular detection mechanism 9 includes a dial indicator 901, a table frame rod 902 and an angular slide rail 903 along the axial direction of the detection table 1. The angular slide rail 903 is installed outside one side of the zero-point clamping base 2, and the bottom end of the table frame rod 4 is clamped with the angular slide rail 903 and can be moved and positioned along the angular slide rail 903. The tail end of the dial indicator 901 is installed at the top end of the table frame rod 902. The measuring head end of the dial indicator 901 corresponds to the head end of the electrode 4. The dial indicator 901 is used in a traditional way, with the table head abutting against the head end of the electrode 4 to push the table frame rod 4 to move along the angular slide rail 903. The details will not be repeated here.

[0034] The lifting mechanism 7 is installed at the other end of the upper table of the detection table 1 for controlling the vertical lifting of the movable bracket 8. The lifting mechanism 7 can be automatic or manual. The specific function is to adjust the movable bracket 8 according to the clamping height of the electrode 4 so that the distance measuring sensor 6 on the movable bracket 8 corresponds to the head end of the electrode 4; according to needs, the manual lifting mechanism 7 includes a lifting slide and two lifting slides that are spaced and vertically arranged on the table top of the detection table. The top ends of the two lifting slides are connected by a cross plate, and a lifting screw is provided between the two lifting slides. The bottom end of the lifting screw is rotatably connected to the table top of the detection table, and the top end of the lifting screw rotates through the cross plate and is fixed with a rotating handle. The rod body of the lifting screw is equipped with a lifting nut, and the outer wall of the lifting nut is fixed to the middle of the inner plate surface of the lifting slide. The two sides of the outer plate surface of the lifting slide are respectively clamped on the two lifting slides and can move along the lifting slide. The movable bracket 8 is fixed on the outer plate surface of the lifting slide, and the movable bracket 8 is controlled to upgrade and adjust the positioning by manually twisting the rotating handle;

[0035] The upper surface of the mobile bracket 8 is provided with distance sensors 6 in the X direction and Y direction corresponding to the electrode head end. The distance sensor 6 signal is connected to an analysis and control device for analyzing and processing measurement data. Of course, it is not limited to two groups of distance sensors 6. Spatial multi-directional and multi-dimensional sensor measurements can be adopted. Multi-channel sensors can realize simultaneous measurement in multiple directions, and use the control program to realize the judgment conditions with linkage to achieve offline measurement and calibration of special-shaped tools (electrodes). With the help of the measurement of the distance sensor 6, the stored parameters of the measurement conditions (based on PLC storage records) are used to make timely judgments. According to the shape of the tool (such as the electrode), the conversion relationship between the direct measurement parameters and the spatial point measurement parameters is used to realize the measurement and correction of its spatial position and angular state; according to needs, the mobile bracket 8 is set to an L-shaped or U-shaped support rod, and the two distance sensors 6 are respectively installed on the two mutually perpendicular support rods to facilitate bypassing the electrode detection position; in addition, the distance sensor 6 is set to an infrared reflection distance sensor.

[0036] A method for using an offline measurement and correction system for assembling a workpiece comprises the following steps:

[0037] S1. Determine the measurement zero position of the distance measuring sensor 6; clamp the lower end of the calibration rod to the zero point clamping base 2, adjust the lifting mechanism 7, use the distance measuring sensor 6 to measure the center position of the upper end of the calibration rod, and record the measured basic position data into the analysis and control device, and then remove the calibration rod;

[0038] S2. Preliminary measurement and clamping of electrode 4; fix the tail end of electrode 4 to the upper end of angle fine-tuning mechanism 3, clamp the lower end of angle fine-tuning mechanism 3 to the zero-point clamping base 2, and preliminarily adjust the angle fine-tuning mechanism 3 so that electrode 4 is in a nearly vertical state;

[0039] S3. Determine the theoretical spatial deviation data of the electrode 4; first, use the angular detection mechanism 9 to measure the deflection angular direction of the electrode 4, then adjust the lifting mechanism 7 so that the distance sensor 6 can measure the distance to the tip of the electrode 4, and obtain the final theoretical adjustment distance, which is recorded by the analysis and control device;

[0040] S4, the electrode 4 is corrected in place; the angle fine-tuning mechanism 3 is adjusted until the actual adjustment angle of the electrode 4 meets the requirements, and the analysis and control device gives an adjustment signal;

[0041] S5. Remove the electrode 4 with the angle fine-adjustment mechanism 3 and install it into the zero-point clamping base of the EDM equipment.

[0042] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. An offline measurement and correction system for assembled workpieces, characterized by: The invention comprises a detection platform (1), a movable bracket (8), a zero-point clamping base (2), an angular detection mechanism (9), a calibration rod, and an electrode (4) vertically arranged on the zero-point clamping base (2) along the Z direction, wherein the lower end of the calibration rod is clamped and adapted to the zero-point clamping base (2), and the upper end of the calibration rod is configured as a square step structure; the zero-point clamping base (2) is mounted on one end of the upper surface of the detection platform (1), and an angle fine-tuning mechanism (3) is connected between the zero-point clamping base (2) and the tail end of the electrode (4), and the angle fine-tuning mechanism (3) is used to The vertical deflection angle between the electrode (4) and the clamping horizontal plane is adjusted; the angular detection mechanism (9) is installed outside one side of the zero-point clamping base (2) and is used to detect and determine the deflection direction of the electrode (4); the other end of the upper table of the detection platform (1) is installed with a lifting mechanism (7) for controlling the vertical lifting of the movable bracket (8); the upper surface of the movable bracket (8) is provided with a distance sensor (6) in the X direction and the Y direction corresponding to the electrode head end, and the distance sensor (6) is connected to an analysis control device for analyzing and processing measurement data.

2. The offline measurement and correction system for assembled workpieces according to claim 1, characterized in that: The angular detection mechanism (9) comprises a dial indicator (901), a meter stand rod (902), and an angular slide rail (903) along the axial direction of the detection platform (1); the angular slide rail (903) is mounted on the outside of one side of the zero-point clamping base (2); the bottom end of the meter stand rod (902) is clamped to the angular slide rail (903) and can be moved and positioned along the angular slide rail (903); the tail end of the dial indicator (901) is mounted on the top end of the meter stand rod (902); and the measuring head end of the dial indicator (901) corresponds to the head end of the electrode (4).

3. The offline measurement and correction system for assembled workpieces according to claim 1, wherein: The angle fine-tuning mechanism (3) comprises a bottom column seat (301), an adjusting middle column (303), a positioning core column (304) and an adjusting upper column (306); the lower end of the bottom column seat (301) is clamped and adapted to the zero-point clamping base (2); a first groove is provided in the center of the upper end face of the bottom column seat (301); four first screw holes for first screws (302) are evenly arranged on the groove wall of the first groove; a plurality of second screw holes are evenly arranged on the groove bottom face of the first groove; a first protrusion for inserting into the first groove is provided in the center of the lower end face of the adjusting middle column (303); an adjusting through hole with a diameter larger than the second screw hole is provided on the lower end face of the first protrusion corresponding to the second screw hole; four third screw holes are evenly arranged on the outer edge of the upper end face of the adjusting middle column (303); A second groove is provided at the center of the upper end surface of the adjusting middle column (303), the positioning core column (304) is inserted into the bottom of the second groove, and the outer edge of the upper end surface of the positioning core column (304) is provided with a countersunk hole corresponding to the second screw hole for screwing into the second screw, a spherical arc groove is provided at the center of the upper end surface of the positioning core column (304), a central sphere (305) is provided in the spherical arc groove, a second protrusion is provided at the center of the lower end surface of the adjusting upper column (306) for inserting into the second groove, the lower end surface of the second protrusion is in contact with the central sphere (305), a connecting hole is provided at the outer edge of the upper end surface of the adjusting upper column (306) for screwing into the third screw hole for connecting, and the tail end of the electrode (4) is installed at the center of the upper end surface of the adjusting upper column (306).

4. The offline measurement and correction system for assembled workpieces according to claim 3, wherein: A clip assembly for quickly clamping the tail end of the electrode (4) is installed in the center of the upper end surface of the adjusting upper column (306).

5. The offline measurement and correction system for assembled workpieces according to claim 1, wherein: The lifting mechanism (7) includes a lifting slide and two lifting rails spaced apart and standing side by side on the surface of the inspection table. The top ends of the two lifting rails are connected by a horizontal plate. A lifting screw is provided between the two lifting rails. The bottom end of the lifting screw is rotatably connected to the surface of the inspection table. The top end of the lifting screw rotates through the horizontal plate and is fixed with a rotating handle. The shaft of the lifting screw is equipped with a lifting nut. The outer wall of the lifting nut is fixed to the middle of the inner plate of the lifting slide. Both sides of the outer plate of the lifting slide are respectively clamped on the two lifting slides and can move along the lifting slide. The movable bracket (8) is fixed to the outer plate of the lifting slide.

6. The offline measurement and correction system for assembled workpieces according to claim 1, characterized in that: The movable bracket (8) is configured as an L-shaped or U-shaped support rod, and the two distance measuring sensors (6) are respectively mounted on two mutually perpendicular support rod bodies.

7. The offline measurement and correction system for assembled workpieces according to claim 1, characterized in that: The zero-point clamping base (2) is detachably fixedly connected to the detection table (1) via two hook-shaped pressure plates symmetrically arranged on both sides of the bottom, and a limit stopper is fixed on the upper surface of the detection table (1) on the front side of the zero-point clamping base (2).

8. The offline measurement and correction system for assembled workpieces according to claim 1, wherein: The zero-point clamping base (2) is configured as a 3R pneumatic zero-point fixture, an electric control box (10) for controlling the opening and closing of the 3R pneumatic zero-point fixture is provided below the testing platform (1), and a switch button (5) is provided on the upper surface of the testing platform (1).

9. The offline measurement and correction system for assembled workpieces according to claim 1, wherein: The distance measuring sensor (6) is set as an infrared reflection distance measuring sensor.

10. A method for using the offline measurement and correction system for assembling workpieces as claimed in claim 1, comprising the following steps: S1. Determine the measurement zero position of the distance sensor (6); clamp the lower end of the calibration rod to the zero point clamping base (2), adjust the lifting mechanism (7), use the distance sensor (6) to measure the center position of the upper end of the calibration rod, and record the measured basic position data in the analysis and control device, and then remove the calibration rod; S2. Preliminary measurement and clamping of the electrode (4); fixing the tail end of the electrode (4) to the upper end of the angle fine-tuning mechanism (3), clamping the lower end of the angle fine-tuning mechanism (3) to the zero-point clamping base (2), and preliminarily adjusting the angle fine-tuning mechanism (3) so that the electrode (4) is in a nearly vertical state; S3, determining the theoretical spatial deviation data of the electrode (4); first using the angular detection mechanism (9) to measure the deflection angle of the electrode (4), then adjusting the lifting mechanism (7) so that the distance sensor (6) can measure the distance to the head end of the electrode (4), obtaining the final theoretical adjustment distance, and recording it by the analysis and control device; S4, the electrode (4) is corrected into position; the angle fine-tuning mechanism (3) is adjusted until the actual adjustment angle of the electrode (4) meets the requirements, and the analysis and control device gives an adjustment signal; S5. Remove the electrode (4) with the angle fine-tuning mechanism (3) and install it into the zero-point clamping base of the electric spark equipment.

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