Universal grinding machine

Abstract

This invention relates to the field of grinding equipment technology, specifically disclosing a universal grinding machine. The grinding machine includes a machine base, a grinding mechanism at the upper end of the machine base, a support platform for placing workpieces at the upper end of the machine base, a pressure plate for pressing the workpiece above the support platform, and adjustable grinding mechanisms on both sides of the support platform. The grinding mechanism includes a grinding belt driven by a motor, with a lower inclined surface for grinding the upper edge of the workpiece and an upper inclined surface for grinding the lower edge of the workpiece at the end of the grinding belt facing the workpiece. A loading platform is provided at the front end of the machine base, the loading platform including a base, and a translation seat with adjustable height and left and right position inside the base. A feeding plate with adjustable front and rear distance is provided at the upper end of the translation seat, and a replaceable clamp is provided on the feeding plate. This invention uses a three-stage adjustable mechanical loading platform to save costs, and uses a double-inclined grinding belt for more comprehensive grinding, covering workpieces of different widths and thicknesses, making it widely applicable.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, specifically a general-purpose grinding machine. Background Technology

[0002] During the manufacturing process, the welded and cut ends of workpieces are often ground. Patent CN222430265U discloses a workpiece grinding equipment that uses a robot for loading. After loading, the workpiece is clamped and fixed, and its two ends are ground by a grinding wheel. The grinding wheel (as shown in the attached drawing, the grinding surface of the grinding wheel faces upward) can move left and right and up and down. This technical solution reduces the time and error of manual operation through automated control and improves the grinding efficiency.

[0003] However, the above solutions still have the following problems: 1. Using robots for material feeding results in high manufacturing costs, which are difficult for small and medium-sized enterprises to bear; 2. Using abrasive wheels for grinding, the grinding surface of the abrasive wheel (as shown in the attached diagram, the grinding surface of the abrasive wheel faces upward) is fixed, which makes it impossible to grind the upper edges, the grinding range is not comprehensive enough, and the versatility is poor. Summary of the Invention

[0004] This invention addresses the aforementioned shortcomings of existing technologies by providing a universal grinding machine. It employs a three-stage adjustable mechanical loading table to lower the barrier to entry, making equipment investment easily affordable for small and medium-sized enterprises and promoting automated grinding. Simultaneously, it utilizes a double-sloping grinding belt for more comprehensive grinding. The spacing and depth of the grinding belts are adjustable, covering workpieces of different widths and thicknesses, thus offering wide applicability. To achieve the above objectives, the present invention provides the following technical solution: A general-purpose grinding machine includes a machine base, a grinding mechanism at the upper end of the machine base, a support table for placing workpieces at the upper end of the machine base, a pressure plate for pressing the workpiece above the support table, and adjustable grinding mechanisms on both sides of the support table. Each grinding mechanism includes a grinding belt driven by a motor, with a lower inclined surface for grinding the upper edge of the workpiece and an upper inclined surface for grinding the lower edge of the workpiece at the end of the grinding belt facing the workpiece. A loading platform is located at the front end of the machine base, the loading platform including a base, a translation seat with adjustable height and left / right position inside the base, a feeding plate with adjustable front-to-back distance at the upper end of the translation seat, and replaceable clamps on the feeding plate.

[0005] Preferably, the upper end of the machine base is provided with a protective cover, the side of the protective cover facing the feeding table is open, the upper end of the protective cover is provided with a first hydraulic cylinder for driving the pressure plate, the bottom of the support table is connected to the machine base through a support plate, the two sides of the support plate are respectively provided with a fixed seat and a movable seat for fixing the grinding mechanism, the upper end of the machine base is provided with a second hydraulic cylinder and a fourth guide rail, the lower end of the movable seat cooperates with the fourth guide rail through a fourth slider, the second hydraulic cylinder pulls the movable seat to move horizontally, the side wall of the support plate is provided with a positioning rod, the upper end of the movable seat is provided with a top frame, the top frame cooperates with the positioning rod to achieve clamping of the workpiece. Preferably, both the movable seat and the fixed seat are provided with a sixth guide rail and a third hydraulic cylinder at their upper ends. The grinding mechanism also includes a support base. The lower end of the support base cooperates with the sixth guide rail via a sixth slider. The third hydraulic cylinder pulls the support base to move horizontally. A support plate is provided above the support base. A fifth guide rail and a cylinder connected to the support plate are provided on the side wall of the support base. A side plate is connected to one end of the support plate. The side plate cooperates with the fifth guide rail via a fifth slider. A support plate is provided at the upper end of the support plate. A pulley for supporting the grinding belt and a support wheel are provided on one side of the support plate. A third motor for driving the pulley is provided on the other side of the support plate. Preferably, the lower end of the lifting platform is connected to the base via a screw jack, the inner side wall of the base is provided with a second guide rail, both ends of the lifting platform are engaged with the second guide rail via second sliders, the upper end of the lifting platform is provided with a third guide rail, the side wall of the lifting platform is provided with a rack, the lower end of the translation seat is engaged with the third guide rail via a third slider, one end of the translation seat is connected to a second motor, the output shaft of the second motor is provided with a gear that meshes with the rack, the upper end of the translation seat is provided with a first guide rail and a first screw perpendicular to the third guide rail, one end of the first screw is connected to a first motor, and the bottom of the feeding plate is engaged with the first guide rail via a first slider and with the first screw via a nut sleeve.

[0006] Preferably, the upper end of the feeding plate is provided with a positioning block and a quick clamp, the bottom of the clamp is connected to a mounting plate, one end of the mounting plate is provided with a positioning groove that cooperates with the positioning block, and the other end of the mounting plate is pressed and fixed by the quick clamp.

[0007] Preferably, the clamp includes a first jaw capable of gripping from the left and right and a second jaw capable of gripping from the top and bottom.

[0008] Preferably, the second gripper includes a housing, the front end of which is provided with a carrier plate that can move back and forth, and the side wall of the carrier plate is provided with upper and lower clamping seats. The upper gripper and the lower gripper are respectively connected to the clamping seats by a rotating shaft. The upper gripper and the lower gripper are respectively connected to the carrier plate by a second spring. A fourth hydraulic cylinder is provided inside the housing. The end of the piston rod of the fourth hydraulic cylinder is connected to a push rod. The push rod passes through the carrier plate and is located between the upper gripper and the lower gripper. The push rod is connected to an upper push block that pushes the upper gripper to close and a lower push block that pushes the lower gripper to close through a push plate.

[0009] Preferably, the back of the carrier plate is connected to an upper guide plate and a lower guide plate that cooperate with the inner wall of the outer shell, the end of the lower guide plate is provided with a baffle, and the inner wall of the outer shell is provided with a limiting block that cooperates with the baffle.

[0010] Preferably, the upper end of the lower guide plate is provided with a support column, and guide cylinders and guide pins are respectively provided on both sides of the support column. The support column is connected to a swing rod through a rotating shaft, and one end of the swing rod is connected to a swing column. A locking pin is slidably fitted inside the guide cylinder, and the swing column passes through the locking pin and is slidably fitted with the locking pin. The lower end of the locking pin can extend from the bottom of the lower guide plate. A pressure frame is provided on the back of the carrier plate. A first spring is connected between the side wall of the pressure frame and the lower guide plate. The guide pin is inserted into the bottom of the pressure frame, and the pressure frame and the guide pin are slidably fitted. The push rod and the swing rod are both located inside the pressure frame. The upper end of the push rod is provided with a retaining groove that cooperates with the pressure frame, and one side of the retaining groove is provided with an inclined lifting surface. The upper inner wall of the pressure frame is inclined. When the second gripper is in the initial state, the pressure frame cooperates with the stop groove. When the piston rod of the fourth cylinder extends, the push rod pushes the carrier plate forward through the pressure frame. After the stop plate cooperates with the limit block, the push rod continues to move forward, and the lifting surface lifts the pressure frame. At this time, the locking pin drives the swing rod to rotate under the action of gravity. The lower end of the locking pin extends from the bottom of the lower guide plate and cooperates with the end of the outer shell to fix the front and rear positions of the carrier plate. The push rod continues to move forward and drives the upper and lower jaws to achieve the clamping action through the upper and lower push blocks. During clamping, the lower jaw first lifts the plate workpiece flat, and then the upper jaw presses on the upper end of the plate workpiece to complete the clamping.

[0011] Preferably, the front end of the carrier plate is connected to a vertical positioning plate via a support block, and the positioning plate is located between the upper claw and the lower claw and in front of the push plate. Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses a three-stage adjustable mechanical feeding platform (vertical lifting + left and right translation + front and rear feeding) to replace expensive robots, ensuring precise feeding, saving costs, lowering the barrier to entry, and making equipment investment easily affordable for small and medium-sized enterprises, thus popularizing automated grinding. Simultaneously, it employs a double-sloping grinding belt to complete the grinding of both upper and lower edges of the workpiece in a single pass, avoiding manual flipping or tool changing, improving grinding efficiency, and achieving high-efficiency grinding. Furthermore, the grinding belt and workpiece use a flexible fit, resulting in more comprehensive grinding. The grinding belt spacing and grinding depth are adjustable, covering workpieces of different widths and thicknesses, greatly improving the equipment's versatility. This device integrates automatic feeding, automatic workpiece positioning and clamping, automatic grinding, and automatic unloading functions, significantly reducing manual intervention, improving production efficiency, and ensuring a smooth feeding, processing, and unloading process by tightly connecting the feeding platform and grinding station, shortening non-processing time and improving continuous operation capability.

[0012] 2. This invention can achieve three-way locking of annular workpieces. The positioning rod (left limit), the moving top frame (right clamping), and the pressure plate (vertically pressing the weld) form a rigid triangular constraint, suppressing grinding vibration, ensuring dimensional accuracy, and avoiding the deformation risk of traditional clamping. Furthermore, the pressure plate and support table work together to press the weld position, ensuring the weld is horizontal and preventing tilting. 3. The second gripper of the present invention adopts a sophisticated linkage, which can realize the self-locking and anti-reverse of the carrier plate during use, ensuring the reliability of use and improving the clamping rigidity. The clamping adopts the method of lifting first and then clamping to ensure that the plate workpiece can be clamped horizontally, ensuring the reliability of the plate workpiece when loading and placing. At the same time, it can prevent the plate from warping during unloading and protect the thin plate workpiece.

[0013] 4. The positioning block and quick clamp on the feeding plate of this invention enable quick replacement and accurate positioning of the clamps (first clamp / second clamp), seamlessly switching between clamping wheel hub-type ring-shaped workpieces and plate-type workpieces.

[0014] 5. The inclined grinding belt of this invention (the upper inclined surface grinds the lower edge, and the lower inclined surface grinds the upper edge) combined with precise position control (spacing, height, feed) ensures that the removal of burrs on the edges is uniform and consistent; the grinding belts on both sides can grind both sides of the workpiece at the same time (as shown in the lower edge), or grind the upper and lower edges alternately by switching the height, which is highly efficient and has good symmetry; each moving part (translation seat, lifting platform, feeding plate, support, pallet) is equipped with guide rail slider to ensure smooth movement, good rigidity, reduce vibration, and improve the quality of the ground surface. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 Schematic diagram of the three-dimensional structure of the loading platform Figure 1 ; Figure 3 Schematic diagram of the three-dimensional structure of the loading platform Figure 2 ; Figure 4 This is the front view of the loading platform; Figure 5 This is a schematic diagram of the structure in which the first gripper engages with the feed plate. Figure 6 This is a schematic diagram of the grinding machine. Figure 7 This is a schematic diagram of the grinding mechanism; Figure 8 This is a three-dimensional structural diagram of the second gripper; Figure 9 A cross-sectional view of the second gripper in its initial state; Figure 10 This is a cross-sectional view of the lower jaw of the second gripper lifting the workpiece. Figure 11 This is a cross-sectional view of the workpiece held by the second gripper. Figure 12 This is a cross-sectional view of the workpiece being clamped by the upper and lower jaws. Figure 13 This is a schematic diagram of the lower claw structure; Figure 14 This is a schematic diagram of the push-down block structure; Figure 15 A schematic diagram of the structure for the engagement of the push rod and the push plate; Figure 16 for Figure 9 A magnified structural diagram at point A; In the diagram: 1-Grinding machine; 101-Machine base; 102-Protective cover; 103-Support plate; 104-Positioning rod; 105-Support table; 106-Pressure plate; 107-First hydraulic cylinder; 108-Second hydraulic cylinder; 109-Fourth guide rail; 110-Fixed seat; 111-Moving seat; 112-Top frame; 113-Fourth slider; 2-Loading platform; 201-Base; 202-Lifting platform; 203-Transfer seat; 204-First guide rail; 205-First wire... 206-First motor; 207-Feeding plate; 208-Second guide rail; 209-Second slider; 210-Screw jack; 211-Third guide rail; 212-Gear; 213-Rack; 214-Second motor; 215-First slider; 216-Third slider; 217-Positioning block; 218-Quick clamp; 3-First gripper; 4-Grinding mechanism; 401-Third motor; 402-Pulley; 403-Grinding belt; 404-Support plate ; 405-Support wheel; 406-Pattern; 407-Side plate; 408-Fifth guide rail; 409-Support base; 410-Sixth guide rail; 411-Sixth slider; 412-Third hydraulic cylinder; 413-Pneumatic cylinder; 414-Fifth slider; 5-Mounting plate; 501-Positioning groove; 6-Second gripper; 601-Outer shell; 602-Upper guide plate; 603-Carrier plate; 604-Grip base; 605-Push plate; 606-Upper push block; 607-Upper gripper; 608- Lower claw; 609-Push block; 610-Positioning plate; 611-Support block; 612-Pressure frame; 613-Guide pin; 614-Swing rod; 615-Support column; 616-Locking pin; 617-Swing column; 618-Lower guide plate; 619-Limit block; 620-Baffle; 621-Fourth cylinder; 622-First spring; 623-Second spring; 624-Push rod; 625-Guide cylinder; 626-Stop groove; 627-Lifting surface; 7-Sheet metal workpiece. Detailed Implementation The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] like Figure 1 As shown, a general-purpose grinding machine 1 includes a base 101. The upper end of the base 101 is provided with a grinding mechanism 4 and a support table 105 for placing workpieces. Above the support table 105 is a pressure plate 106 for pressing the workpiece. The two sides of the support table 105 are provided with grinding mechanisms 4 whose positions (height and distance from the workpiece) are adjustable. The grinding mechanism 4 includes a grinding belt 403 driven by a motor. The end of the grinding belt 403 facing the workpiece is provided with a lower inclined surface for grinding the upper edge of the workpiece and an upper inclined surface for grinding the lower edge of the workpiece. The front end of the base 101 is provided with a loading platform 2. The loading platform 2 includes a base 201. The base 201 is provided with a height-adjustable lifting platform 202 and a left and right position-adjustable translation seat 203. The upper end of the translation seat 203 is provided with a feed plate 207 whose front and rear distances are adjustable. The feed plate 207 is provided with replaceable clamps. Different clamps are used to clamp different workpieces.

[0017] The specific structure is as follows: like Figure 6 As shown, the upper end of the base 101 is provided with a protective cover 102. The side of the protective cover 102 facing the feeding table is open. The upper end of the protective cover 102 is provided with a first hydraulic cylinder 107 that drives the pressure plate 106. The bottom of the support platform 105 is connected to the base 101 through a support plate 103. The two sides of the support plate 103 are respectively provided with a fixed seat 110 and a movable seat 111 for fixing the grinding mechanism 4. The upper end of the base 101 is provided with a second hydraulic cylinder 108 and a fourth guide rail 109. The lower end of the movable seat 111 cooperates with the fourth guide rail 109 through a fourth slider 113. The second hydraulic cylinder 108 pulls the movable seat 111 to move horizontally along the fourth guide rail 109. The side wall of the support plate 103 is provided with a positioning rod 104. The upper end of the movable seat 111 is provided with a top frame 112. The top frame 112 cooperates with the positioning rod 104 to clamp the workpiece. like Figure 7As shown, both the upper ends of the movable base 111 and the fixed base 110 are provided with a sixth guide rail 410 and a third hydraulic cylinder 412. The grinding mechanism 4 also includes a support 409. The lower end of the support 409 cooperates with the sixth guide rail 410 through a sixth slider 411. The third hydraulic cylinder 412 pulls the support 409 to move horizontally along the sixth guide rail 410. A support plate 406 is provided above the support 409. A fifth guide rail 408 is provided on the side wall of the support 409 and is connected to the support plate 406. The cylinder 413 is connected to the support plate 406. One end of the support plate 406 is connected to the side plate 407. The side plate 407 cooperates with the fifth guide rail 408 through the fifth slider 414. The upper end of the support plate 406 is provided with a support plate 404. One side of the support plate 404 is provided with a pulley 402 and a support wheel 405 that support the grinding belt 403. The shape of the grinding belt 403 is determined by the pulley 402. The other side of the support plate 404 is provided with a third motor 401 that drives the pulley 402.

[0018] According to the width of the workpiece, the distance between the two grinding belts 403 is adjusted by the translation of the moving seat 111. During the grinding process, the grinding belt 403 is fed and retracted by the moving support 409. The height of the grinding belt 403 is switched by the cylinder 413, so as to switch between the upper and lower inclined surfaces of the grinding belt 403. like Figure 2 , Figure 3 , Figure 4 The lower end of the lifting platform 202 is connected to the base 201 via a screw jack 210. The screw jack 210 is driven by a motor to adjust the height of the lifting platform 202. A second guide rail 208 is provided on the inner side wall of the base 201. Both ends of the lifting platform 202 are engaged with the second guide rail 208 via second sliders 209 to ensure the stability of the height adjustment of the lifting platform 202. A third guide rail 211 is provided at the upper end of the lifting platform 202. A rack 213 is provided on the side wall of the lifting platform 202. The lower end of the translation seat 203 is engaged with the third guide rail 211 via a third slider 216. One end of the translation seat 203 is connected to... A second motor 214 is provided, and a gear 212 that meshes with a rack 213 is provided on the output shaft of the second motor 214. The left and right positions of the translation seat 203 are adjusted by the second motor 214. The upper end of the translation seat 203 is provided with a first guide rail 204 and a first lead screw 205 that are perpendicular to the third guide rail 211. One end of the first lead screw 205 is connected to the first motor 206. The bottom of the feeding plate 207 is engaged with the first guide rail 204 through the first slider 215 and with the first lead screw 205 through the nut sleeve. The feeding plate 207 feeds the workpiece into the grinding machine 1. After grinding, the workpiece is taken out.

[0019] like Figure 5As shown, the upper end of the feeding plate 207 is provided with two positioning blocks 217 and two quick clamps 218. The bottom of the clamp is connected to the mounting plate 5. One end of the mounting plate 5 is provided with a positioning groove 501 that cooperates with the positioning blocks 217. The other end of the mounting plate 5 is pressed and fixed by the quick clamps 218.

[0020] The clamp includes a first jaw 3 that can grip from the left and right and a second jaw 6 that can grip from the top and bottom.

[0021] The structure of the first gripper 3 is similar to the clamping part in a workpiece grinding device disclosed in patent CN222430265U, and can be used to clamp ring-shaped workpieces such as wheel hub steel rings in the initial processing stage.

[0022] The annular workpiece is fitted onto the support platform 105 from one side, with the weld seam located at the upper end of the support platform 105. The left side rests against the positioning rod 104, and the weld seam is pressed tightly by the pressure plate 106. The moving seat 111 moves horizontally, so that the top frame 112 presses against the other side of the workpiece. The top frame 112 and the positioning rod 104 position the workpiece left and right. The upper inclined surface of the grinding belt 403 can be used to grind the lower edges on both sides of the workpiece first. During grinding, the third oil cylinder 412 is started, driving the grinding belt 403 to move towards the workpiece, so that the grinding belt 403 presses against the side wall of the workpiece. After grinding, the grinding belt 403 retracts away from the workpiece. After the cylinder 413 lifts the grinding belt 403, the grinding belt 403 moves towards the workpiece again, so that the lower inclined surface of the grinding belt 403 grinds the upper edge of the workpiece. After grinding, the grinding belt 403 retracts away from the workpiece. After grinding, the pressure plate 106 is raised, the top frame 112 moves to the right to release the workpiece, and the first gripper 3 takes the workpiece away from the support table 105.

[0023] like Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12As shown, the second gripper 6 includes a housing 601. The front end of the housing 601 has a movable carrier plate 603. The back of the carrier plate 603 is connected to an upper guide plate 602 and a lower guide plate 618 that mate with the inner wall of the housing 601. The end of the lower guide plate 618 has a baffle 620. The inner wall of the housing 601 has a limiting block 619 that mates with the baffle 620, limiting the maximum forward distance of the carrier plate 603. The front of the carrier plate 603 has two clamping seats 604, upper and lower. The clamping seats 604 are connected to an upper gripper 607 and a lower gripper 608 respectively via a rotating shaft. The upper gripper 607... The upper claw 607 and the lower claw 608 are connected to the carrier plate 603 via a second spring 623. The second spring 623 pulls the upper claw 607 and the lower claw 608 to keep them in the open state. A fourth hydraulic cylinder 621 is provided inside the housing 601. The piston rod of the fourth hydraulic cylinder 621 is connected to a push rod 624. The push rod 624 passes through the carrier plate 603 and is located between the upper claw 607 and the lower claw 608. In use, the push rod 624 pushes the carrier plate 603 to open. At the same time, the push rod 624 is connected to an upper push block 606 that pushes the upper claw 607 to close and a lower push block 609 that pushes the lower claw 608 to close via a push plate 605.

[0024] The upper end of the lower guide plate 618 is provided with a support column 615. Guide cylinders 625 and guide pins 613 are respectively provided on both sides of the support column 615. The support column 615 is connected to a rocker arm 614 via a pivot. One end of the rocker arm 614 is connected to a rocker pin 617. A locking pin 616 is slidably fitted inside the guide cylinder 625. The rocker pin 617 passes through the locking pin 616 and slidably fits with it, ensuring that when the rocker arm 614 rotates, the rocker pin 617 can drive the locking pin 616 to move up and down. The lower end of the locking pin 616... It can extend from the bottom of the lower guide plate 618. A pressure frame 612 is provided on the back of the carrier plate 603. The pressure frame 612 is attached to the side wall of the carrier plate 603. A first spring 622 connects the side wall of the pressure frame 612 and the lower guide plate 618. The first spring 622 pulls the pressure frame 612 downwards. A guide pin 613 is inserted into the bottom of the pressure frame 612. The pressure frame 612 and the guide pin 613 slide against each other, ensuring that the pressure frame 612 can only move up and down. The push rod 624 and the swing rod 614 are both located inside the pressure frame 612. Figure 15 , Figure 16As shown, the upper end of the push rod 624 is provided with a retaining groove 626 that mates with the pressure frame 612. One side of the retaining groove 626 is provided with an inclined lifting surface 627, and the upper inner wall of the pressure frame 612 is an inclined surface. When the second gripper 6 is in the initial state, the pressure frame 612 mates with the retaining groove 626. When the piston rod of the fourth cylinder 621 extends, because the retaining groove 626 mates with the pressure frame 612, the push rod 624 will push the carrier plate 603 forward through the pressure frame 612. When the baffle 620 mates with the limiting block 619, the carrier plate 603 can no longer move forward, while the push rod 624 continues to move forward, and the lifting surface 627 will insert into the pressure frame 612. As the lifting surface 627 tilts towards the... The support rod lifts the pressure frame 612. As the pressure frame 612 rises, the end of the swing rod 614 is unrestrained. At this time, the locking pin 616 moves downward under the action of gravity, causing the swing rod 614 to rotate. The lower end of the locking pin 616 extends from the bottom of the lower guide plate 618 and cooperates with the end of the housing 601, making the lower guide plate 618 unable to move backward. Under the action of the locking pin 616 and the baffle 620, the front and rear positions of the carrier plate 603 are fixed. The push rod 624 continues to move forward, and through the push plate 605, it drives the upper push block 606 and the lower push block 609 to move forward. The upper push block 606 and the lower push block 609 respectively drive the upper claw 607 and the lower claw 608 to achieve the clamping action.

[0025] The front end of the carrier plate 603 is connected to a vertical positioning plate 610 via a support block 611. The positioning plate 610 is located between the upper jaw 607 and the lower jaw 608 and in front of the push plate 605. During clamping, the end of the workpiece is positioned on the positioning plate 610 and then clamped.

[0026] During clamping, the lower jaw 608 first lifts the sheet metal workpiece 7 flat, and then the upper jaw 607 presses down on the upper end of the sheet metal workpiece 7 to complete the clamping. The specific implementation structure is as follows: Figure 13 As shown, the bottom of the lower claw 608 is provided with an inclined surface A and a horizontal surface B, and the left side of the inclined surface A is connected to the horizontal surface B, as shown. Figure 14 As shown, the upper end of the push block 609 is provided with a horizontal surface C, and the right end of the horizontal surface C is connected to an inclined surface D. When clamping, the inclined surface D cooperates with the inclined surface A. As the push block 609 moves forward, the push block 609 lifts the lower jaw 608 flat, that is, the clamping end of the lower jaw 608 is in a horizontal state. At this time, the horizontal surface C cooperates with the horizontal surface B to keep the lower jaw 608 in a horizontal state, while the push block 606 pushes the upper jaw 607 to rotate downward, thus completing the clamping of the sheet metal workpiece 7.

[0027] During reset, the fourth cylinder 621 retracts, pulling the push rod 624 back. After the lifting surface 627 is pulled out from the pressure frame 612, the pressure frame 612 moves downward under the pull of the first spring 622. The pressure frame 612 presses down the swing rod 614, and the swing rod 614 pulls up the locking pin 616 through the swing column 617. The bottom of the locking pin 616 is retracted into the guide cylinder 625. The push rod 624 continues to retract, and after the push plate 605 contacts the carrier plate 603, it will drive the carrier plate 603 to move backward to achieve reset.

[0028] The sheet metal workpiece 7 is fed onto the support table 105, and the pressure plate 106 presses and fixes the sheet metal workpiece 7. Then, the burrs on both ends are polished. After polishing, the material is unloaded by the second gripper 6.

[0029] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A general-purpose grinding machine, the grinding machine comprising a machine base, wherein a grinding mechanism is provided at the upper end of the machine base, characterized in that: The upper end of the machine base is provided with a support platform for placing workpieces. Above the support platform is a pressure plate for pressing the workpieces. On both sides of the support platform are adjustable grinding mechanisms. The grinding mechanism includes a grinding belt driven by a motor. The end of the grinding belt facing the workpiece has a lower inclined surface for grinding the upper edge of the workpiece and an upper inclined surface for grinding the lower edge of the workpiece. The front end of the machine base is provided with a loading platform. The loading platform includes a base. The base has a height-adjustable lifting platform. The upper end of the lifting platform is provided with a left and right adjustable translation seat. The upper end of the translation seat is provided with a feed plate with adjustable front and rear distance. The feed plate is provided with replaceable clamps. The clamp includes a first jaw capable of gripping left and right and a second jaw capable of gripping up and down; The second gripper includes a housing. The front end of the housing is provided with a carrier plate that can move back and forth. The side wall of the carrier plate is provided with upper and lower clamping seats. The upper and lower grippers are respectively connected to the clamping seats via rotating shafts. The upper and lower grippers are respectively connected to the carrier plate via second springs. A fourth hydraulic cylinder is provided inside the housing. The piston rod of the fourth hydraulic cylinder is connected to a push rod at the end. The push rod passes through the carrier plate and is located between the upper and lower grippers. The push rod is connected to an upper push block that pushes the upper gripper to close and a lower push block that pushes the lower gripper to close via a push plate. The back of the carrier plate is connected to an upper guide plate and a lower guide plate that cooperate with the inner wall of the housing. The end of the lower guide plate is provided with a baffle. The inner wall of the housing is provided with a limiting block that cooperates with the baffle. The upper end of the lower guide plate is provided with a support column, and the two sides of the support column are respectively provided with guide cylinders and guide pins. The support column is connected to a swing rod through a rotating shaft. One end of the swing rod is connected to a swing column. A locking pin is slidably fitted inside the guide cylinder. The swing column passes through the locking pin and is slidably fitted with the locking pin. The lower end of the locking pin can extend from the bottom of the lower guide plate. A pressure frame is provided on the back of the carrier plate. A first spring is connected between the side wall of the pressure frame and the lower guide plate. The guide pin is inserted into the bottom of the pressure frame. The pressure frame and the guide pin are slidably fitted. The push rod and the swing rod are both located inside the pressure frame. The upper end of the push rod is provided with a stop groove that cooperates with the pressure frame. One side of the stop groove is provided with an inclined lifting surface. The upper inner wall of the pressure frame is an inclined surface. During clamping, the lower jaw first lifts the plate workpiece flat, and then the upper jaw presses on the upper end of the plate workpiece to complete the clamping.

2. The general-purpose grinding machine as described in claim 1, characterized in that: The upper end of the machine base is equipped with a protective cover. The side of the protective cover facing the feeding table is open. The upper end of the protective cover is equipped with a first hydraulic cylinder that drives the pressure plate. The bottom of the support platform is connected to the machine base through a support plate. The two sides of the support plate are respectively equipped with a fixed seat and a movable seat for fixing the grinding mechanism. The upper end of the machine base is equipped with a second hydraulic cylinder and a fourth guide rail. The lower end of the movable seat cooperates with the fourth guide rail through a fourth slider. The second hydraulic cylinder pulls the movable seat to move horizontally. The side wall of the support plate is equipped with a positioning rod. The upper end of the movable seat is equipped with a top frame. The top frame cooperates with the positioning rod to clamp the workpiece.

3. A general-purpose grinding machine as described in claim 2, characterized in that: Both the movable seat and the fixed seat are equipped with a sixth guide rail and a third hydraulic cylinder at their upper ends. The grinding mechanism also includes a support. The lower end of the support engages with the sixth guide rail via a sixth slider. The third hydraulic cylinder pulls the support to move horizontally. A support plate is provided above the support. A fifth guide rail and a cylinder connected to the support plate are provided on the side wall of the support. A side plate is connected to one end of the support plate. The side plate engages with the fifth guide rail via a fifth slider. A support plate is provided at the upper end of the support plate. A pulley for supporting the grinding belt and a support wheel are provided on one side of the support plate. A third motor for driving the pulley is provided on the other side of the support plate.

4. A general-purpose grinding machine as described in claim 1, characterized in that: The lower end of the lifting platform is connected to the base via a screw jack. A second guide rail is provided on the inner side wall of the base. The two ends of the lifting platform are engaged with the second guide rail via second sliders. A third guide rail is provided at the upper end of the lifting platform. A rack is provided on the side wall of the lifting platform. The lower end of the translation seat is engaged with the third guide rail via a third slider. A second motor is connected to one end of the translation seat. A gear that meshes with the rack is provided on the output shaft of the second motor. The upper end of the translation seat is provided with a first guide rail and a first screw perpendicular to the third guide rail. One end of the first screw is connected to the first motor. The bottom of the feeding plate is engaged with the first guide rail via a first slider and with the first screw via a nut sleeve.

5. A general-purpose grinding machine as described in claim 4, characterized in that: The upper end of the feeding plate is provided with a positioning block and a quick clamp. The bottom of the clamp is connected to a mounting plate. One end of the mounting plate is provided with a positioning groove that cooperates with the positioning block. The other end of the mounting plate is pressed and fixed by the quick clamp.

6. A general-purpose grinding machine as described in claim 1, characterized in that: The front end of the carrier plate is connected to a vertical positioning plate via a support block. The positioning plate is located between the upper and lower claws and in front of the push plate.

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