Error-proof detection welding fixture

Abstract

The present invention discloses an anti-mistake detection welding fixture, which relates to the field of welding technology. By setting a force-sensitive resistor array and a high-precision high-temperature tape on the welding tabletop, combined with a permanent magnet plate, a clamping rod and an electromagnet assembly, the present invention realizes the precise detection and firm clamping of the welding parts. The force-sensitive resistor is connected in series with the monitoring unit, and the clamping action is triggered only when the position of the part is correct, effectively preventing misaligned welding. The permanent magnet plate bracket adjusts the electric cylinder and the swing electric cylinder to work together, flexibly adjusting the clamping angle and position to adapt to various part shapes. The support frame can be rotated and adjusted to meet different welding requirements. The present invention has a compact structure and simple operation, significantly improving the welding precision and efficiency, and is suitable for the automated welding scenario of complex parts.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and particularly to an anti-error detection welding fixture. Background Art

[0002] Existing welding fixtures usually fix parts by mechanical clamping or manual positioning, relying on the operator's experience to judge whether the position of the parts is correct. This method has the following disadvantages: First, there is a lack of an automated position detection mechanism, and when the parts are placed incorrectly, it is easy to cause welding deviations, affecting product quality. Second, the clamping force of traditional fixtures is fixed, making it difficult to adapt to parts of different shapes or sizes, and the versatility is poor. Third, the adjustment of the clamping mechanism is complex, requiring manual adjustment of the clamping points, with low operating efficiency, especially taking a long time in the welding of complex parts. These disadvantages make it difficult for the existing technology to meet the requirements of modern manufacturing for high-precision welding in terms of automation, precision, and efficiency. Summary of the Invention

[0003] To overcome the defects of the above-mentioned existing technology, the present invention provides the following technical solution: An anti-error detection welding fixture, including a welding tabletop, on the upper surface of which a plurality of force-sensitive resistors are arranged in a rectangular array, and each force-sensitive resistor is arranged in a corresponding monitoring unit; a permanent magnet plate is arranged above the welding tabletop, and the permanent magnet plate is controlled by an electro-cylinder for adjusting the permanent magnet plate bracket to move vertically. A plurality of clamping rods are magnetically attracted and contacted with the lower surface of the permanent magnet plate. The bottom end of each clamping rod is slidably inserted and provided with a clamping slide rod, and the bottom end of the clamping slide rod is fixedly installed with a clamping head. The clamping head and the clamping rod are elastically matched through a rubber sleeve, and the rubber sleeve is sleeved on the clamping slide rod.

[0004] Preferably, the permanent magnet plate is fixedly installed on the permanent magnet plate bracket, the permanent magnet plate bracket is slidably installed on the swing plate, the electro-cylinder for adjusting the permanent magnet plate bracket is fixedly installed on the swing plate, and the permanent magnet plate bracket is fixedly matched with the end of the telescopic rod of the electro-cylinder for adjusting the permanent magnet plate bracket to drive the permanent magnet plate bracket to slide on the swing plate.

[0005] Preferably, the swing plate is movably installed on the swing plate bracket, the swing plate bracket is fixedly installed on the extended support plate, both the extended support plate and the welding tabletop are fixedly installed on the support frame. An electro-cylinder for swinging is also movably installed on the extended support plate, a swing rod is rotatably installed on the swing plate bracket, the swing rod is fixedly matched with the swing plate through a rotating shaft, and one end of the swing rod far from the swing plate bracket is movably connected with the end of the telescopic rod of the electro-cylinder for swinging.

[0006] Preferably, an electromagnet is fixedly installed on the lower surface of the welding tabletop. A clamping iron block is arranged above the welding tabletop. The clamping iron block is magnetically matched with the electromagnet. The clamping iron block is lapped on the surface of the part to be welded. High-temperature tape is covered on all the force-sensitive resistors. The high-temperature tape is fixedly connected to the edge of the welding tabletop to fix the position of the high-temperature tape on the force-sensitive resistors. And the contour shape of the part to be welded is printed on the upper surface of the high-temperature tape, which is convenient for placing the part to be welded on the high-temperature tape.

[0007] Preferably, the high-temperature tape and the welding tabletop are fixedly matched in a manner that is convenient for replacement. All the monitoring units where the force-sensitive resistors are located corresponding to the printed contour shape position on the high-temperature tape are arranged in series with the permanent magnet plate support adjusting electric cylinder. The conduction of all the monitoring units is used as the starting condition for the telescopic rod of the permanent magnet plate support adjusting electric cylinder to extend.

[0008] Preferably, the support frame is rotatably installed at the center position of the upper surface of the base. An edge retaining ring concentric with the base is fixedly installed at the edge position of the upper surface of the base.

[0009] Preferably, a swing arm is fixedly installed at the bottom of the support frame. The swing arm is slidably matched with the upper surface of the base. A screw is threadedly inserted and matched on the swing arm. The screw is in contact and extrusion fit with the upper surface of the base. One end of the swing arm away from the support frame is slidably matched with the edge retaining ring. The edge retaining ring is used to prevent the end of the swing arm away from the support frame from separating from the base.

[0010] Preferably, the monitoring unit includes a force-sensitive resistor and a fixed-value resistor R1 connected in series in a 5V DC power supply. A NPN triode is connected in parallel at both ends of the fixed-value resistor R1. The base of the NPN triode is electrically connected to the high-potential point of the fixed-value resistor R1. The emitter of the NPN triode is electrically connected to the low-potential point of the fixed-value resistor R1.

[0011] Preferably, the input end of the monitoring unit is electrically connected to the collector of the NPN triode, and the output end of the monitoring unit is electrically connected to the emitter of the NPN triode.

[0012] The present invention has the following beneficial effects compared with the prior art: (1) By arranging a force-sensitive resistor array on the welding tabletop and covering it with a high-temperature tape printed with the part contour, the clamping action can only be started after the monitoring unit is turned on when the part is correctly placed and presses the force-sensitive resistor, otherwise the clamping of the part cannot be completed. It effectively avoids part misalignment, improves welding accuracy, is particularly suitable for high-precision welding scenarios of complex parts, and significantly reduces the scrap rate caused by human errors; (2) The position of the clamping rod on the permanent magnet plate of the present invention can be freely adjusted according to the shape of the part. Combining the elastic clamping of the rubber sleeve and the sliding design of the clamping slide rod, it can adapt to parts of various shapes and sizes. Compared with traditional fixed fixtures, the present invention has stronger versatility, reduces the frequency of fixture replacement, and improves production efficiency; (3) Through the coordinated control of the electric cylinder and the swing electric cylinder adjusted by the permanent magnet plate bracket, the movement and angle adjustment of the clamping mechanism are automated, and the operator only needs to make simple settings to complete clamping and resetting. Compared with the traditional manual adjustment of the fixture, the present invention significantly shortens the preparation time and improves the automation level of the production line; (4) The support frame of the present invention can rotate on the base. With the angle adjustment of the swing plate, the tooling fixture can flexibly adapt to the needs of different welding angles. The design of the swing arm and the edge buckle ensures stability after rotation and avoids the limitations of traditional fixed fixtures in multi-angle welding. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] Figure 2 for the present invention Figure 1 is a schematic diagram of the structure at position A in;

[0015] Figure 3 is a schematic diagram of the structure at the swing rod of the present invention;

[0016] Figure 4 is a schematic diagram of the support frame structure of the present invention;

[0017] Figure 5 is a schematic diagram of the clamping rod structure of the present invention;

[0018] Figure 6 for the present invention Figure 5 is a schematic diagram of the structure at position B in;

[0019] Figure 7 is a distribution diagram of the force-sensitive resistors of the present invention;

[0020] Figure 8 is a schematic diagram of multiple monitoring units connected in series of the present invention;

[0021] Figure 9 is a schematic diagram of the monitoring unit of the present invention.

[0022] In the figure: 101 - base; 102 - support frame; 103 - edge buckle; 104 - swing arm; 105 - screw; 106 - extended support plate; 107 - swing cylinder; 108 - swing plate bracket; 109 - swing rod; 110 - swing plate; 111 - permanent magnet plate bracket adjusting cylinder; 112 - permanent magnet plate bracket; 113 - permanent magnet plate; 114 - clamping iron block; 115 - clamping rod; 116 - electromagnet; 117 - welding table; 118 - high-temperature tape; 119 - clamping slide bar; 120 - rubber sleeve; 121 - clamping head; 122 - force-sensitive resistor. Detailed implementation manners

[0023] The following combines the attached Figures 1-9 , and further illustrates the technical solution of the present invention through specific implementation manners.

[0024] The present invention provides an anti-error detection welding fixture, which includes a welding table 117. A plurality of force-sensitive resistors 122 are arranged in a rectangular array on the upper surface of the welding table 117, and each force-sensitive resistor 122 is disposed in a corresponding monitoring unit. Above the welding table 117, a permanent magnet plate 113 is provided. The permanent magnet plate 113 is controlled to move vertically by a permanent magnet plate support adjusting cylinder 111. A plurality of clamping rods 115 are magnetically attracted and contacted with the lower surface of the permanent magnet plate 113. The bottom end of each clamping rod 115 is slidably inserted and provided with a clamping slide rod 119. A clamping head 121 is fixedly installed at the bottom end of the clamping slide rod 119. The clamping head 121 is elastically matched with the clamping rod 115 through a rubber sleeve 120, and the rubber sleeve 120 is sleeved on the clamping slide rod 119. The permanent magnet plate 113 is fixedly installed on a permanent magnet plate support 112. The permanent magnet plate support 112 is slidably installed on a swing plate 110. The permanent magnet plate support adjusting cylinder 111 is fixedly installed on the swing plate 110. The permanent magnet plate support 112 is fixedly matched with the end of the telescopic rod of the permanent magnet plate support adjusting cylinder 111 for driving the permanent magnet plate support 112 to slide on the swing plate 110. The swing plate 110 is movably installed on a swing plate support 108. The swing plate support 108 is fixedly installed on an extended support plate 106. Both the extended support plate 106 and the welding table 117 are fixedly installed on a support frame 102. An oscillating cylinder 107 is also movably installed on the extended support plate 106. A swing rod 109 is rotatably installed on the swing plate support 108. The swing rod 109 is fixedly matched with the swing plate 110 through a rotating shaft. One end of the swing rod 109 away from the swing plate support 108 is movably connected to the end of the telescopic rod of the oscillating cylinder 107. An electromagnet 116 is fixedly installed on the lower surface of the welding table 117. Above the welding table 117, a clamping iron block 114 is provided. The clamping iron block 114 is magnetically matched with the electromagnet 116. The clamping iron block 114 is lapped on the surface of the part to be welded. A high-temperature tape 118 is covered on all the force-sensitive resistors 122. The high-temperature tape 118 is fixedly connected to the edge of the welding table 117 for fixing the position of the high-temperature tape 118 on the force-sensitive resistors 122. And the contour shape of the part to be welded is printed on the upper surface of the high-temperature tape 118, which is convenient for placing the part to be welded on the high-temperature tape 118. The high-temperature tape 118 and the welding table 117 are fixedly matched in a way that is convenient for replacement. The monitoring units where all the force-sensitive resistors 122 are located corresponding to the printed contour shape position on the high-temperature tape 118 are arranged in series with the permanent magnet plate support adjusting cylinder 111. The conduction of all the monitoring units is used as the starting condition for the telescopic rod of the permanent magnet plate support adjusting cylinder 111 to extend. The support frame 102 is rotatably installed at the center position of the upper surface of the base 101. An edge retaining ring 103 concentric with the base 101 is fixedly installed at the edge position of the upper surface of the base 101.A swing arm 104 is fixedly installed at the bottom of the support frame 102. The swing arm 104 is slidably matched with the upper surface of the base 101. A screw 105 is threadedly inserted and arranged on the swing arm 104. The screw 105 is in contact extrusion fit with the upper surface of the base 101. One end of the swing arm 104 far from the support frame 102 is slidably matched with the edge snap ring 103. The edge snap ring 103 is used to prevent the end of the swing arm 104 far from the support frame 102 from separating from the base 101. The monitoring unit includes a force-sensitive resistor 122 and a fixed-value resistor R1 connected in series in a 5V DC power supply. A NPN triode is arranged in parallel at both ends of the fixed-value resistor R1. The base of the NPN triode is electrically connected to the high-potential point of the fixed-value resistor R1, and the emitter of the NPN triode is electrically connected to the low-potential point of the fixed-value resistor R1. The input end of the monitoring unit is electrically connected to the collector of the NPN triode, and the output end of the monitoring unit is electrically connected to the emitter of the NPN triode.

[0025] The working principle of the error-proof detection welding fixture disclosed in the present invention is as follows: According to the shape of the parts to be welded, the corresponding shape is printed on the high-temperature tape 118 (or manually marked with a line), and then the high-temperature tape 118 is installed on the welding table 117. At the same time, the monitoring end elements where all the force-sensitive resistors 122 corresponding to the printed shape on the high-temperature tape 118 are arranged in series with the permanent magnet plate support adjusting cylinder 111 (the greater the array density of the force-sensitive resistors 122, the higher the monitoring accuracy). Only when the welded parts are placed correctly on the high-temperature tape 118 will the parts press all the corresponding force-sensitive resistors 122 below (the parts press the force-sensitive resistors 122 by gravity). At this time, the resistance value of the force-sensitive resistor 122 in the corresponding monitoring unit decreases after being squeezed, which will cause the potential difference across the fixed resistor R1 to increase and make the potential difference greater than 0.7V. At this time, the collector and emitter of the corresponding NPN transistor are turned on, so the input and output ends of the monitoring unit are turned on. Only when all the force-sensitive resistors 122 in all the (force-sensitive resistors 122 corresponding to the printed part of the high-temperature tape 118) monitoring units are squeezed will the permanent magnet plate support adjusting cylinder 111 be powered on, otherwise the permanent magnet plate support adjusting cylinder 111 cannot work properly. Therefore, the clamping work can only be carried out when there are parts placed at the printed position on the high-temperature tape 118. When clamping, first start the swing cylinder 107, control the telescopic rod of the swing cylinder 107 to extend, and the telescopic rod of the swing cylinder 107 drives the swing rod 109 and the swing plate 110 to swing synchronously on the swing plate support 108, driving the permanent magnet plate support 112 and the permanent magnet plate 113 on the swing plate 110 to swing, and making the permanent magnet plate 113 swing towards the part direction so that the permanent magnet plate 113 is in a horizontal state (when resetting, control the telescopic rod of the swing cylinder 107 to contract). According to the shape of the placed parts, change the position of the clamping rod 115 on the permanent magnet plate 113 so that the clamping head 121 on the clamping rod 115 is aligned with the part (square steel part, such as the table support leg), control the telescopic rod of the permanent magnet plate support adjusting cylinder 111 to extend, and the telescopic rod of the permanent magnet plate support adjusting cylinder 111 drives the permanent magnet plate 113 on the permanent magnet plate support 112 to move downward, and all the clamping rods 115 on the permanent magnet plate 113 will move downward, making the clamping head 121 contact and clamp the part (the rubber sleeve 120 provides the clamping force, and the rubber sleeve 120 deforms, and the clamping rod 115 slides relative to the clamping slide rod 119). At this time, the user uses a welding torch to spot-weld at the welding position of the part to fix the position between the parts. After all the positions are spot-welded, control the telescopic rod of the permanent magnet plate support adjusting cylinder 111 to contract to make the clamping rod 115 away from the part, and control the swing cylinder 107 to reset the permanent magnet plate 113. Subsequently, place the clamping iron block 114 on the upper surface of the part.In addition, the electromagnet 116 can be connected in series in all monitoring units (all monitoring units corresponding to the printed part of the high-temperature tape 118), and its function is the same as that of the permanent magnet plate support adjusting electric cylinder 111 (also clamping the parts to be welded). After the parts are placed in position, the clamping iron block 114 is placed on the upper surface of the parts (if the parts are made of magnetic materials, the clamping iron block 114 can be omitted). Then, start the electromagnet 116 (the electromagnet 116 cannot be started if the parts are not placed correctly). The electromagnet 116 generates magnetic force to attract the clamping iron block 114 to clamp the parts (if the parts are made of iron, the parts can be directly attracted to fix their positions). The position of the support frame 102 on the base 101 can be adjusted. Adjust the position of the support frame 102 according to the welding situation (rotate the support frame 102 to make the position of the parts follow the rotation). After adjustment, only need to rotate the screw 105 to fix the swing arm 104 on the base 101, so as to prevent the support frame 102 from continuing to rotate on the base 101.

Claims

1. Anti-error detection welding fixture, characterized in that: It includes a welding tabletop (117). A rectangular array of force-sensitive resistors (122) is provided on the upper surface of the welding tabletop (117), and each force-sensitive resistor (122) is arranged in a corresponding monitoring unit; Above the welding tabletop (117), a permanent magnet plate (113) is provided. The permanent magnet plate (113) is controlled to move vertically by a permanent magnet plate support adjusting cylinder (111). The lower surface of the permanent magnet plate (113) is magnetically attracted and contacted with a plurality of clamping rods (115). The bottom end of each clamping rod (115) is slidably inserted and equipped with a clamping slide rod (119). The bottom end of the clamping slide rod (119) is fixedly installed with a clamping head (121). The clamping head (121) and the clamping rod (115) are elastically matched through a rubber sleeve (120), and the rubber sleeve (120) is sleeved on the clamping slide rod (119); An electromagnet (116) is fixedly installed on the lower surface of the welding tabletop (117). Above the welding tabletop (117), a clamping iron block (114) is provided. The clamping iron block (114) is magnetically coupled with the electromagnet (116). The clamping iron block (114) is lapped on the surface of the part to be welded. A high-temperature tape (118) is provided to cover all the force-sensitive resistors (122). The high-temperature tape (118) is fixedly connected to the edge of the welding tabletop (117) to fix the position of the high-temperature tape (118) on the force-sensitive resistors (122). And the contour shape of the part to be welded is printed on the upper surface of the high-temperature tape (118), which is convenient for placing the part to be welded on the high-temperature tape (118); The permanent magnet plate (113) is fixedly installed on a permanent magnet plate support (112). The permanent magnet plate support (112) is slidably installed on a swing plate (110). The permanent magnet plate support adjusting cylinder (111) is fixedly installed on the swing plate (110). The permanent magnet plate support (112) is fixedly matched with the end of the telescopic rod of the permanent magnet plate support adjusting cylinder (111) to drive the permanent magnet plate support (112) to slide on the swing plate (110); The high-temperature tape (118) and the welding tabletop (117) are fixedly matched in a manner that is convenient for replacement. The monitoring units where all the force-sensitive resistors (122) corresponding to the printed contour shape position on the high-temperature tape (118) are located are arranged in series with the permanent magnet plate support adjusting cylinder (111). Only when the part is correctly placed and presses the force-sensitive resistor, the conduction of all the monitoring units is used as the starting condition for the telescopic rod of the permanent magnet plate support adjusting cylinder (111) to extend.

2. The anti-error detection welding fixture according to claim 1, characterized in that: The swing plate (110) is movably installed on the swing plate bracket (108), the swing plate bracket (108) is fixedly installed on the extended support plate (106), both the extended support plate (106) and the welding tabletop (117) are fixedly installed on the support frame (102). Among them, a swing electric cylinder (107) is also movably installed on the extended support plate (106), a swing rod (109) is rotatably installed on the swing plate bracket (108), the swing rod (109) is fixedly fitted with the swing plate (110) through a rotating shaft, and one end of the swing rod (109) far from the swing plate bracket (108) is movably connected to the end of the telescopic rod of the swing electric cylinder (107).

3. The anti-mistake detection welding fixture according to claim 2, wherein: The support frame (102) is rotatably installed at the center position of the upper surface of the base (101), and an edge retaining ring (103) concentric with the base (101) is fixedly installed at the edge position of the upper surface of the base (101).

4. The anti-error detection welding tooling fixture according to claim 3, characterized in that: A swing arm (104) is fixedly installed at the bottom of the support frame (102), the swing arm (104) is slidably fitted with the upper surface of the base (101), a screw (105) is threadedly inserted and fitted on the swing arm (104), the screw (105) is in contact and extrusion fit with the upper surface of the base (101), and one end of the swing arm (104) far from the support frame (102) is slidably fitted with the edge retaining ring (103). The edge retaining ring (103) is used to prevent one end of the swing arm (104) far from the support frame (102) from separating from the base (101).

5. The anti-mistake detection welding tooling fixture according to claim 4, characterized in that: The monitoring unit includes a force-sensitive resistor (122) and a fixed-value resistor R1 connected in series in a 5V DC power supply. A NPN transistor is connected in parallel at both ends of the fixed-value resistor R1. The base of the NPN transistor is electrically connected to the high-potential point of the fixed-value resistor R1, and the emitter of the NPN transistor is electrically connected to the low-potential point of the fixed-value resistor R1.

6. The anti-error detection welding tooling fixture according to claim 5, characterized in that: The input end of the monitoring unit is electrically connected to the collector of the NPN transistor, and the output end of the monitoring unit is electrically connected to the emitter of the NPN transistor.

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