A machine tool outer sheet metal positioning and assembling device and method

Abstract

The application relates to sheet metal processing technology, in particular to a machine tool outer sheet metal positioning and assembling equipment and method, which comprises a base and a shell arranged on the base, further comprises a traction driving mechanism arranged on the shell and two groups of sliding and pushing units arranged in pairs, the two groups of sliding and pushing units are oppositely arranged, each group of sliding and pushing units comprises a guide structure, a sliding block, a stop block, a traction belt, a baffle, an elastic piece and a reset mechanism, the sliding block is in sliding cooperation with the guide structure, the stop block is arranged at the lower part of the sliding block, the baffle is slidingly arranged in the sliding block, the elastic piece is connected between the baffle and the sliding block, one end of the traction belt is connected with the traction driving mechanism, the other end is fixedly connected with the baffle, and the reset mechanism is connected with the sliding block; the eccentric roller eccentrically rotates to drive the sliding block to first press down and flatten the sheet metal and then push the sheet metal to splice together, after the sheet metal is spliced, the eccentric rotation of the eccentric roller will press down and fix the position close to the sheet metal splicing part.

Description

Technical Field

[0001] This invention relates to the field of sheet metal processing technology, specifically to a machine tool external sheet metal positioning and assembly equipment and method. Background Technology

[0002] Machine tool external sheet metal positioning and assembly equipment is a special auxiliary tooling equipment adapted to the installation of external protective sheet metal parts of various CNC machine tools. It integrates functions such as precise positioning, posture adjustment, and fixing and locking. It is designed for the pre-assembly and assembly process of sheet metal components such as machine tool covers and protective plates, and is widely used in the production, assembly and debugging of machine tools.

[0003] Existing machine tool sheet metal positioning and assembly equipment is difficult to adapt to sheet metal workpieces with slight bending or warping deformation. Direct splicing of bent sheets will cause defects such as uneven splicing gaps and misalignment of sheets. At the same time, traditional equipment lacks a trajectory-guided composite motion structure and an elastic buffer clamping structure. Rigid extrusion deformation is prone to occur during the sheet metal straightening process, and it is difficult to achieve continuous follow-up clamping after splicing. The internal stress of the sheet metal itself is very easy to cause springback and offset, further reducing splicing accuracy and assembly consistency. The overall equipment has poor operational stability and processing adaptability, making it difficult to meet the production requirements of high-precision sheet metal batch assembly. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a machine tool external sheet metal positioning and assembly equipment and method.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a machine tool external sheet metal positioning and assembly equipment, including a base and a housing disposed on the base, the housing having an opening inside, and also including a traction drive mechanism disposed on the housing and two sets of sliding push units arranged in pairs, the two sets of sliding push units being arranged opposite to each other and acting on two sheet metal pieces to be assembled respectively. Each set of sliding push units includes a guide structure, a sliding block, a stop block, a traction belt, a baffle, an elastic element, and a reset mechanism. The sliding block is slidably engaged with the guide structure. The stop block is disposed at the lower part of the sliding block. The baffle is slidably disposed inside the sliding block. The elastic element is connected between the baffle and the sliding block. One end of the traction belt is connected to the traction drive mechanism, and the other end is fixedly connected to the baffle. The reset mechanism is connected to the sliding block. The traction drive mechanism is used to synchronously pull or release the traction belts of the two sets of sliding push units; when the traction belt is pulled, the baffle transmits traction force to the sliding block through the elastic element, so as to drive the sliding block to move along the guide structure to the splicing position of the two sheet metal pieces to be assembled, and cause the two sets of baffles to push the corresponding sheet metal pieces to be assembled closer to the splicing position; after the traction belt is released, the reset mechanism drives the corresponding sliding block to reset to the initial position.

[0006] Preferably, the guide structure includes a horizontal guide section extending in a horizontal direction toward the splicing position. When the sliding block moves along the horizontal guide section, it pushes the corresponding sheet metal to be assembled toward the splicing position through the stop block.

[0007] Preferably, the guide structure further includes a downward pressure guide section communicating with the horizontal guide section. The downward pressure guide section is located on the side of the horizontal guide section away from the splicing position and is inclined or arc-shaped relative to the horizontal guide section. When the sliding block moves from the downward pressure guide section to the horizontal guide section, it first generates a downward pressure displacement toward the sheet metal to be assembled, and then generates a horizontal displacement along the horizontal guide section toward the splicing position.

[0008] Preferably, the guide structure includes a guide groove formed on the housing, and the pressing guide section and the horizontal guide section are respectively formed by the pressing groove section and the horizontal groove section of the guide groove; at least one rotating pin is rotatably provided on both sides of the sliding block, and each rotating pin extends into the corresponding guide groove and can move along the guide groove.

[0009] Preferably, the sliding block has a receiving cavity, the baffle is slidably disposed in the receiving cavity, the elastic element is a compression spring, and the two ends of the compression spring are respectively connected to the baffle and the sliding block.

[0010] Preferably, when the stop block pushes the corresponding sheet metal to be assembled to the splicing position, thus restricting the continued movement of the sliding block, the traction belt can continue to pull the baffle relative to the sliding block and compress the compression spring, so that the stop block maintains elastic pressure on the corresponding sheet metal to be assembled through the compression spring.

[0011] Preferably, the traction drive mechanism includes two take-up members corresponding to the two sets of sliding push units. Both take-up members are rotatably configured. One end of the traction belt connected to the traction drive mechanism is fixed to the side wall of the corresponding take-up member. When the take-up member rotates in the forward direction, it winds up the corresponding traction belt. When it rotates in the reverse direction, it releases the corresponding traction belt.

[0012] Preferably, both winding components are eccentric rollers, and each eccentric roller is fixedly mounted on a corresponding first rotating shaft. The traction drive mechanism further includes a servo motor, a second rotating shaft, two worms with opposite helical directions, and two worm wheels. The second rotating shaft is connected to the servo motor. The two worms are mounted on the second rotating shaft, and the two worm wheels are respectively mounted on the corresponding first rotating shafts and mesh with the corresponding worms, so that the servo motor synchronously drives the two eccentric rollers to rotate in opposite directions through the second rotating shaft.

[0013] Preferably, the reset mechanism of each set of sliding push units includes a telescopic barrel, a telescopic rod, and a spring disposed in the telescopic barrel. The telescopic barrel is connected to the housing. One end of the telescopic rod is rotatably connected to the corresponding sliding block, and the other end is slidably inserted into the telescopic barrel. The spring acts between the telescopic barrel and the telescopic rod. After the servo motor drives the two eccentric rollers in the reverse direction to release the corresponding traction belt, the spring drives the corresponding sliding block to reset to the initial position through the telescopic rod.

[0014] This application also proposes a machine tool external sheet metal positioning and assembly method, applicable to the above-mentioned sheet metal positioning and assembly equipment, the method comprising the following steps: Place the two sheet metal pieces to be assembled at the corresponding positions of the two sets of sliding push units; The traction drive mechanism synchronously pulls the traction belts of the two sets of sliding push units, so that each traction belt pulls the corresponding baffle, and the baffle transmits the traction force to the corresponding sliding block through the elastic spring, so as to drive the two sets of sliding blocks to move along the corresponding guide structure to the splicing position. The corresponding sheet metal to be assembled is pushed towards the splicing position by the stops at the lower part of the two sets of sliding blocks; After the two sheet metal pieces to be assembled are joined at the splicing position and the continued movement of the sliding block is restricted, the baffle is pulled to move relative to the sliding block and cause the compression spring to undergo elastic deformation, so that the baffle keeps the corresponding sheet metal to be assembled elastically pressed. After the elastic compression is completed, the traction drive mechanism is reversed to release the two sets of traction belts, and the telescopic rods and telescopic buckets of the two sets of reset mechanisms respectively drive the corresponding sliding blocks to reset to the initial position.

[0015] The beneficial effects of this invention are: (1) The machine tool external sheet metal positioning and assembly equipment of the present invention adopts two sets of eccentric rollers rotating relative to each other to drive the sliding block and the stop block to splice the sheet metal. The two sets of worm gears have opposite spiral directions to ensure that the movement height of the rollers on both sides is synchronized. At the same time, the worm gear transmission has the characteristics of self-locking, no gap and no slippage. When in contact with the sheet metal, the force is uniform and it can accurately correct the offset of the sheet metal and complete the initial splicing alignment.

[0016] (2) The machine tool external sheet metal positioning and assembly equipment of the present invention relies on the eccentric roller winding traction belt to drive the sliding block and the stop block to move. The sliding block cooperates with the special trajectory of the arc section and the horizontal section of the guide groove to enable the sliding block to realize the composite action of first pressing down to correct and then horizontally pushing the sheet metal. At the same time, the stop block smoothly pushes the sheet metal to accurately connect, and the sheet metal correction and splicing process is completed in one integrated manner.

[0017] (3) The machine tool external sheet metal positioning and assembly equipment of the present invention is equipped with elastic parts and a reset mechanism. After the sheet metal is spliced ​​in place, the compression spring and the baffle can be compressed and contracted to achieve elastic avoidance.

[0018] (4) The machine tool external sheet metal positioning and assembly equipment method described in this invention, the setting of the eccentric roller can first drive the sliding block to press down and correct the sheet metal, and secondly, the eccentric roller can also drive the stop block to splice the two sheet metals. The relative rotation of the two eccentric rollers can also promote the two sheet metals to move towards the splicing point. Furthermore, the continuous eccentric rotation of the eccentric roller generates downward pressing force, which presses and fixes the sheet metal near the splicing point, effectively preventing the sheet metal from shifting, loosening and springing misalignment during subsequent processing. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the base and the shell; Figure 3 This is a schematic diagram of the connection structure between the first rotating shaft and the housing; Figure 4 This is a schematic diagram of the connection structure between the eccentric roller and the traction belt. Figure 5 This is a schematic diagram of the connection structure between the rotating pin and the sliding block; Figure 6 This is a schematic diagram of the connection structure between the telescopic pole and the telescopic bucket; Figure 7 This is a schematic diagram of the connection structure between the first rotating shaft and the worm gear; Figure 8 This is a schematic diagram of the connection structure between the sliding block and the stop block; Figure 9This is a cross-sectional view of the inside of the sliding block.

[0021] In the diagram: 1. Base; 2. Housing; 21. Opening; 22. Guide groove; 3. First rotating shaft; 31. Eccentric roller; 32. Worm gear; 33. Worm; 34. Second rotating shaft; 4. Rotating pin; 41. Sliding block; 42. Stop block; 43. Traction belt; 51. Baffle; 52. Compression spring; 6. Reset mechanism; 61. Telescopic rod; 62. Telescopic bucket. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] Example 1: As Figure 1 - Figure 9 As shown in the figure, this application embodiment proposes a machine tool external sheet metal positioning and assembly equipment, including a base 1 and a housing 2 disposed on the base 1. The housing 2 has an opening 21 inside. It also includes a traction drive mechanism disposed on the housing 2 and two sets of sliding push units arranged in pairs. The two sets of sliding push units are arranged opposite to each other and act on two pieces of sheet metal to be assembled.

[0024] Each sliding push unit includes a guide structure, a sliding block 41, a stop block 42, a traction belt 43, a baffle 51, an elastic element, and a reset mechanism 6. The sliding block 41 is slidably engaged with the guide structure. The stop block 42 is located at the lower part of the sliding block 41. The baffle 51 is slidably disposed within the sliding block 41. The elastic element is connected between the baffle 51 and the sliding block 41. One end of the traction belt 43 is connected to the traction drive mechanism, and the other end is fixedly connected to the baffle 51. The reset mechanism 6 is connected to the sliding block 41. As the core sliding load-bearing component, the sliding block 41 can slide stably with the help of the guide structure. The sliding engagement structure between the baffle 51 and the elastic element can flexibly transmit traction power and avoid sheet metal extrusion deformation caused by rigid transmission.

[0025] The traction drive mechanism is used to synchronously pull or release the traction belts 43 of the two sets of sliding push units. When the traction belts 43 are pulled, the baffle 51 transmits the traction force to the sliding block 41 through the elastic element, so as to drive the sliding block 41 to move along the guide structure to the splicing position of the two sheet metals to be assembled, and cause the two sets of baffles 42 to push the corresponding sheet metals to be assembled to move closer to the splicing position. After the traction belts 43 are released, the reset mechanism 6 drives the corresponding sliding block 41 to reset to the initial position. The synchronous control mode of the traction drive mechanism can ensure that the push units on both sides move synchronously, avoid the problems of sheet metal offset on one side and uneven joint gap. The elastic transmission structure can buffer the pushing impact force. The reset mechanism can realize the automated cyclic operation of the equipment without manual reset, effectively reducing the intensity of manual operation and improving the stability of continuous assembly operation of the equipment.

[0026] Specifically, the guide structure includes a horizontal guide section extending in a horizontal direction toward the splicing position. When the sliding block 41 moves along the horizontal guide section, it pushes the corresponding sheet metal to be assembled toward the splicing position through the stop block 42. The horizontal guide section of the guide structure adopts a straight and regular guide trajectory design, which can limit the sliding block 41 to only move in a horizontal straight line, ensure that the pushing force of the stop block 42 on the sheet metal is uniform and horizontal, ensure that the two sheet metals to be assembled are parallel and aligned, effectively reduce the splicing gap of the sheet metal, and improve the assembly fitting accuracy and the flatness of the finished product.

[0027] Furthermore, the guide structure also includes a downward pressure guide section connected to the horizontal guide section. The downward pressure guide section is located on the side of the horizontal guide section away from the splicing position and is inclined or arc-shaped relative to the horizontal guide section. When the sliding block 41 moves from the downward pressure guide section to the horizontal guide section, it first generates a downward pressure displacement toward the sheet metal to be assembled, and then generates a horizontal displacement toward the splicing position along the horizontal guide section. The downward pressure guide section and the horizontal guide section of the guide structure are seamlessly connected to form a composite guide trajectory. The motion logic of the sliding block 41 pressing down first and then moving horizontally can compact and correct the sheet metal in advance, eliminate the slight warping and tilting problems when the sheet metal is placed, and lay the foundation for subsequent horizontal and accurate splicing. The dual displacement correction method significantly improves the correction effect and alignment accuracy of sheet metal assembly.

[0028] It should be noted that the guiding structure includes a guide groove 22 formed on the housing 2. The downward guiding section and the horizontal guiding section are respectively composed of the downward groove section and the horizontal groove section of the guide groove 22. At least one rotating pin 4 is rotatably provided on both sides of the sliding block 41. Each rotating pin 4 extends into the corresponding guide groove 22 and can move along the guide groove 22. The integrally formed guide groove 22 has high structural strength and is not easily deformed, which can ensure the accuracy of the guiding trajectory for a long time. The rotating pins 4 symmetrically arranged on both sides of the sliding block 41 adopt a rolling engagement method, which greatly reduces the frictional resistance of the sliding block 41 during the sliding process, avoids jamming and sticking, makes the overall pushing action smoother and more stable, and extends the service life of the equipment parts.

[0029] Specifically, the sliding block 41 is provided with a receiving cavity, the baffle 51 is slidably disposed in the receiving cavity, and the elastic element is a compression spring 52. The two ends of the compression spring 52 are respectively connected to the baffle 51 and the sliding block 41. The receiving cavity inside the sliding block 41 can protect the baffle 51 and the compression spring 52. The compression spring 52 has a large elastic coefficient and uniform expansion and contraction deformation, which can stably realize the flexible transmission of power.

[0030] In addition, when the stop block 42 pushes the corresponding sheet metal to be assembled to the splicing position, thus restricting the continued movement of the sliding block 41, the traction belt 43 can continue to pull the baffle 51 to move relative to the sliding block 41 and compress the compression spring 52, so that the stop block 42 can maintain elastic pressure on the corresponding sheet metal to be assembled through the compression spring 52. This elastic buffer structure can effectively solve the problem that rigid pushing can easily cause sheet metal squeezing damage and excessive pressing deformation. After the sheet metal is aligned, the compression spring 52 continuously outputs stable elastic pressure to achieve gapless flexible pressing, which can lock the sheet metal splicing position and adapt to the small deformation error of sheet metal processing, thereby improving the assembly yield.

[0031] It should be noted that the traction drive mechanism includes two take-up components that correspond one-to-one with the two sets of sliding push units. Both take-up components are rotatably mounted. The end of the traction belt 43 connected to the traction drive mechanism is fixed to the side wall of the corresponding take-up component. When the take-up component rotates forward, it winds up the corresponding traction belt 43, and when it rotates in the reverse direction, it releases the corresponding traction belt 43. The two take-up components independently correspond to the two sets of push units, which can ensure that the traction actions on both sides are independent and synchronous. The connection method of fixing the side wall ensures uniform force distribution and can prevent the traction belt 43 from falling off or shifting. The bidirectional rotation mode of winding and releasing perfectly adapts to the full-process operation requirements of equipment pushing assembly and automatic reset, and the transmission stability is extremely strong.

[0032] Furthermore, both winding components are eccentric rollers 31, which are fixedly connected to the first rotating shaft 3. Each eccentric roller 31 is mounted on a corresponding first rotating shaft 3. The traction drive mechanism also includes a servo motor, a second rotating shaft 34, two worm gears 33 with opposite helical directions, and two worm wheels 32. The second rotating shaft 34 is connected to the servo motor. The two worm gears 33 are mounted on the second rotating shaft 34, and the two worm wheels 32 are respectively mounted on the corresponding first rotating shaft 3 and mesh with the corresponding worm gears 33, so that the servo motor drives the two eccentric rollers 31 to rotate in opposite directions synchronously through the second rotating shaft 34. The transmission structure of the positive and negative helical worm gears 33 and worm wheels 32 can realize the synchronous drive of a single motor to rotate the two eccentric rollers 31 in opposite directions. The transmission has the advantages of self-locking, zero backlash, and anti-slip. The servo motor has precise speed and position control and extremely high rotational accuracy, which can ensure that the pushing force and displacement of the sheet metal on both sides are completely consistent, greatly improving the assembly alignment accuracy.

[0033] It is worth mentioning that the reset mechanism 6 of each sliding push unit includes a telescopic barrel 62, a telescopic rod 61, and a spring installed in the telescopic barrel 62. The telescopic barrel 62 is connected to the housing 2. One end of the telescopic rod 61 is rotatably connected to the corresponding sliding block 41, and the other end is slidably inserted into the telescopic barrel 62. The spring acts between the telescopic barrel 62 and the telescopic rod 61. After the servo motor drives the two eccentric rollers 31 in the opposite direction to release the corresponding traction belt 43, the spring drives the corresponding sliding block 41 to reset to the initial position through the telescopic rod 61. The sliding fit structure of the telescopic barrel 62 and the telescopic rod 61 has strong stability. The spring built into the telescopic barrel 62 can store elastic potential energy during the pushing operation. After the operation is completed, the elastic force is quickly released to achieve automatic reset. No additional power is required, which is energy-saving and efficient. At the same time, the rotational connection method can be adapted to the compound movement of the sliding block 41 to avoid structural jamming, deformation and damage.

[0034] Example 2: Figure 1 - Figure 9 As shown in the figure, this application also proposes a machine tool external sheet metal positioning and assembly method, applicable to the assembly equipment of the above embodiment one. The assembly method includes the following steps: Place the two sheet metal pieces to be assembled at the corresponding positions of the two sets of sliding push units; The traction drive mechanism synchronously pulls the traction belts 43 of the two sets of sliding push units, so that each traction belt 43 pulls the corresponding baffle 51, and the baffle 51 transmits the traction force to the corresponding sliding block 41 through the elastic spring 52, so as to drive the two sets of sliding blocks 41 to move along the corresponding guide structure to the splicing position. The corresponding sheet metal to be assembled is pushed towards the splicing position by the stop block 42 at the bottom of the two sets of sliding blocks 41 respectively. After the two sheet metal pieces to be assembled are joined at the splicing position and the continued movement of the sliding block 41 is restricted, the baffle 51 is pulled to move relative to the sliding block 41 and cause the compression spring 52 to undergo elastic deformation so that the baffle 42 keeps the corresponding sheet metal to be assembled elastically pressed. After the elastic clamping is completed, the reverse drive traction drive mechanism is used to release the two sets of traction belts 43, and the telescopic rods 61 and telescopic buckets 62 of the two sets of reset mechanisms 6 respectively drive the corresponding sliding blocks 41 to reset to the initial position.

[0035] Working principle: When using this invention, the sheet metal to be spliced ​​is inserted through the opening 21. The sheet metal is located at the lower end of the sliding block 41 and on one side of the stop block 42. The housing 2 is set at an angle. The sheet metal is inserted into the housing 2 through the opening 21. At this time, the lower end of the sheet metal is flush with the lower end of the housing 2.

[0036] The upper end of the housing 2 is provided with two symmetrically arranged eccentric rollers 31, and the surface of the second rotating shaft 34 is fixedly connected with two worm gears 33, the helical directions of the two worm gears 33 are opposite; At this time, the servo motor is started to drive the second rotating shaft 34 to rotate. The rotation of the second rotating shaft 34 will drive the worm gear 33 to rotate, which will drive the worm wheel 32 to rotate. The rotation of the worm wheel 32 will drive the first rotating shaft 3 to rotate, which will drive the eccentric roller 31 to rotate. The rotation of the two worm gears 33 will then drive the two eccentric rollers 31 to rotate relative to each other. When the two eccentric rollers 31 come into contact with the sheet metal, they will also have a splicing and alignment effect on the sheet metal. The worm gear transmission has a self-locking characteristic, and the transmission is backlash-free and not easy to slip. The two worm gears on both sides drive the two sets of eccentric rollers to rotate relative to each other. The rollers on both sides move synchronously and uniformly. When they come into contact with the sheet metal, the force is uniform, which can accurately push the sheet metal to translate and correct the offset, and efficiently complete the splicing and alignment of the sheet metal, greatly improving the assembly and alignment accuracy of the sheet metal.

[0037] The rotation of the eccentric roller 31 will wind up the traction belt 43, which is made of polyester canvas. The winding of the traction belt 43 will drive the sliding block 41 to move to one end. The movement of the sliding block 41 to one end will drive the rotating pin 4 to move to one end. The rotating pin 4 slides to one end in the guide groove 22. The arc section of the rotating pin 4 in the guide groove 22 slides to the horizontal section. At this time, the rotating pin 4 will drive the sliding block 41 to press down first and then drive the sliding block 41 to move to one end in the horizontal direction. The first pressing down of the sliding block 41 can straighten the sheet metal. The movement of the sliding block 41 to one end will drive the telescopic rod 61 to move to one end. The movement of the telescopic rod 61 to one end will compress the spring inside the telescopic barrel 62. The function of the telescopic rod 61, the telescopic barrel 62, and the spring inside the telescopic barrel 62 is to pull the sliding block 41 so that the sliding block 41 can automatically reset after the splicing is completed.

[0038] The eccentric roller 31 rotates to rewind the traction belt 43. Relying on the winding tension of the traction belt 43, the sliding block 41 and the rotating pin 4 slide synchronously along the guide groove 22. By switching the trajectory between the arc section and the horizontal section of the guide groove 22, the sliding block 41 forms a compound motion of first pressing down and then moving horizontally. The sheet metal pressing and straightening work can be completed at the same time as the traction belt 43 is winding, which effectively improves the efficiency of sheet metal splicing. At the same time, the sliding block 41 will drive the telescopic rod 61 to move during the movement, compress the spring inside the telescopic barrel 62 and store elastic potential energy. After the sheet metal splicing and straightening and traction belt winding processes are completed, the spring inside the telescopic barrel 62 releases its elastic force, and the telescopic rod 61 pulls the sliding block 41 in the opposite direction to automatically reset.

[0039] The movement of sliding block 41 to one end will cause stop block 42 to move to one end. The movement of stop block 42 to one end will cause sheet metal to slide towards the splicing point. By moving sliding block 41, stop block 42 will move synchronously. By relying on stop block 42 to precisely push sheet metal towards the splicing point, the automated feeding and alignment of sheet metal can be achieved.

[0040] After the sheet metal splicing is completed, the eccentric roller 31 continues to rotate. At this time, the rotation of the eccentric roller 31 will squeeze downward. The eccentric rotation of the eccentric roller 31 fixes the position of the sheet metal near the splicing point. After the sheet metal splicing is completed, the eccentric roller 31 continues to rotate eccentrically to generate downward squeezing force, pressing and fixing the position of the sheet metal near the splicing point. Relying on the eccentric rotation characteristics of the eccentric roller 31, flexible and continuous pressing can be achieved. This follow-up pressing method can lock the splicing position immediately after the sheet metal is spliced ​​in place, effectively preventing the sheet metal from shifting, loosening and springing misalignment during subsequent processing, significantly improving the stability of sheet metal splicing and forming and the overall assembly accuracy, while simplifying the equipment structure, reducing control processes and improving the overall automation processing effect of the equipment.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The descriptions in the above embodiments and specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A machine tool external sheet metal positioning and assembly device, comprising a base and a housing disposed on the base, wherein the housing has an opening inside, characterized in that: It also includes a traction drive mechanism disposed on the housing and two sets of sliding push units arranged in pairs, the two sets of sliding push units being arranged opposite to each other and acting on two sheet metal pieces to be assembled respectively; Each set of sliding push units includes a guide structure, a sliding block, a stop block, a traction belt, a baffle, an elastic element, and a reset mechanism. The sliding block is slidably engaged with the guide structure. The stop block is disposed at the lower part of the sliding block. The baffle is slidably disposed inside the sliding block. The elastic element is connected between the baffle and the sliding block. One end of the traction belt is connected to the traction drive mechanism, and the other end is fixedly connected to the baffle. The reset mechanism is connected to the sliding block. The traction drive mechanism is used to synchronously pull or release the traction belts of the two sets of sliding push units; when the traction belt is pulled, the baffle transmits traction force to the sliding block through the elastic element, so as to drive the sliding block to move along the guide structure to the splicing position of the two sheet metal pieces to be assembled, and cause the two sets of baffles to push the corresponding sheet metal pieces to be assembled closer to the splicing position; after the traction belt is released, the reset mechanism drives the corresponding sliding block to reset to the initial position.

2. The machine tool external sheet metal positioning and assembly equipment according to claim 1, characterized in that: The guide structure includes a horizontal guide section extending in a horizontal direction toward the splicing position. When the sliding block moves along the horizontal guide section, it pushes the corresponding sheet metal to be assembled toward the splicing position through the stop block.

3. The machine tool external sheet metal positioning and assembly equipment according to claim 2, characterized in that: The guide structure also includes a downward pressure guide section that communicates with the horizontal guide section. The downward pressure guide section is located on the side of the horizontal guide section away from the splicing position and is inclined or arc-shaped relative to the horizontal guide section. When the sliding block moves from the downward pressure guide section to the horizontal guide section, it first generates a downward pressure displacement toward the sheet metal to be assembled, and then generates a horizontal displacement along the horizontal guide section toward the splicing position.

4. The machine tool external sheet metal positioning and assembly equipment according to claim 3, characterized in that: The guiding structure includes a guide groove formed on the housing. The pressing guide section and the horizontal guide section are respectively formed by the pressing groove section and the horizontal groove section of the guide groove. At least one rotating pin is rotatably provided on both sides of the sliding block. Each rotating pin extends into the corresponding guide groove and can move along the guide groove.

5. The machine tool external sheet metal positioning and assembly equipment according to claim 1, characterized in that: The sliding block has a receiving cavity, the baffle is slidably disposed in the receiving cavity, the elastic element is a compression spring, and the two ends of the compression spring are respectively connected to the baffle and the sliding block.

6. The machine tool external sheet metal positioning and assembly equipment according to claim 5, characterized in that: When the stop block pushes the corresponding sheet metal to be assembled to the splicing position, thus restricting the continued movement of the sliding block, the traction belt can continue to pull the baffle relative to the sliding block and compress the compression spring, so that the stop block can maintain elastic pressure on the corresponding sheet metal to be assembled through the compression spring.

7. The machine tool external sheet metal positioning and assembly equipment according to claim 1, characterized in that: The traction drive mechanism includes two take-up members that correspond one-to-one with the two sets of sliding push units. Both take-up members are rotatably configured. One end of the traction belt connected to the traction drive mechanism is fixed to the side wall of the corresponding take-up member. When the take-up member rotates in the forward direction, it winds up the corresponding traction belt. When it rotates in the reverse direction, it releases the corresponding traction belt.

8. The machine tool external sheet metal positioning and assembly equipment according to claim 7, characterized in that: Both winding components are eccentric rollers, and each eccentric roller is fixedly mounted on a corresponding first rotating shaft. The traction drive mechanism further includes a servo motor, a second rotating shaft, two worms with opposite helical directions, and two worm wheels. The second rotating shaft is connected to the servo motor. The two worms are mounted on the second rotating shaft, and the two worm wheels are respectively mounted on the corresponding first rotating shafts and mesh with the corresponding worms, so that the servo motor synchronously drives the two eccentric rollers to rotate in opposite directions through the second rotating shaft.

9. The machine tool external sheet metal positioning and assembly equipment according to claim 8, characterized in that: Each set of sliding push units includes a resetting mechanism comprising a telescopic barrel, a telescopic rod, and a spring disposed within the telescopic barrel. The telescopic barrel is connected to the housing. One end of the telescopic rod is rotatably connected to the corresponding sliding block, and the other end is slidably inserted into the telescopic barrel. The spring acts between the telescopic barrel and the telescopic rod. After the servo motor reverses and drives the two eccentric rollers to release the corresponding traction belt, the spring drives the corresponding sliding block to reset to the initial position via the telescopic rod.

10. A method for positioning and assembling sheet metal on an external machine tool, applicable to the machine tool external sheet metal positioning and assembly equipment as described in any one of claims 1-9, characterized in that: The method includes the following steps: Place the two sheet metal pieces to be assembled at the corresponding positions of the two sets of sliding push units; The traction drive mechanism synchronously pulls the traction belts of the two sets of sliding push units, so that each traction belt pulls the corresponding baffle, and the baffle transmits the traction force to the corresponding sliding block through the elastic spring, so as to drive the two sets of sliding blocks to move along the corresponding guide structure to the splicing position. The corresponding sheet metal to be assembled is pushed towards the splicing position by the stops at the lower part of the two sets of sliding blocks; After the two sheet metal pieces to be assembled are joined at the splicing position and the continued movement of the sliding block is restricted, the baffle is pulled to move relative to the sliding block and cause the compression spring to undergo elastic deformation, so that the baffle keeps the corresponding sheet metal to be assembled elastically pressed. After the elastic compression is completed, the traction drive mechanism is reversed to release the two sets of traction belts, and the telescopic rods and telescopic buckets of the two sets of reset mechanisms respectively drive the corresponding sliding blocks to reset to the initial position.

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