A centering device

Abstract

The application relates to a centering device which comprises a base, a clamping body, a right swing arm, a support, a spring, a left swing arm, a rear swing arm, a spring, a rotary shaft, a rack, a screw rod, a left movable block, a right movable block, a transmission shaft, a gear, and a transmission sleeve. The rack is designed with a toothed annular groove, the rack is pushed to move forward and backward through screw rod rotation, the left and right gears are synchronously driven to rotate, the left and right swing arms and the left and right movable blocks are synchronously driven to move towards the center of the clamping body, the center position of a part is coincided with the center position of the clamping body, the automatic determination of the center position of a part with large size tolerance is realized, the layered design of the clamping body and the base is adopted, the determination of the horizontal center position of the part and the determination of the longitudinal coordinate system direction are relatively independent, and the problem that when the perpendicularity error of the horizontal and longitudinal surfaces of a part blank is large, the horizontal center position of the part and the longitudinal coordinate system direction can only be determined in a single direction is avoided.

Description

Technical Field

[0001] This invention belongs to the field of parts processing technology, and specifically relates to a centering device. Background Technology

[0002] When the parts being machined are castings or welded parts as blanks, the dimensional tolerances of such blanks are relatively large. When the machining datum needs to be determined based on the center position of the blank's dimensional dimensions, the current practice is to manually scribble lines on the parts and then align them according to the scribble lines to determine the machining datum.

[0003] While manually scribing blanks such as castings and welded parts can solve the problem of determining the center position of parts with large dimensional tolerances, it requires scribing every part being machined, resulting in a large workload and low production efficiency. Summary of the Invention

[0004] This invention provides a centering device to solve the technical problem of: the need to manually scribing to determine the center position of parts with large dimensional tolerances in castings, welded parts, etc., which results in a large workload, and improves production efficiency.

[0005] To solve the above technical problems, the present invention provides a centering device, characterized in that it includes a base 1, a clamping body 2, a right swing arm 3, a left swing arm 10, a rear swing arm 11, a rotating shaft 18, a rack 20, a screw 21, a left movable block 26, a right movable block 27, a transmission shaft 28, and a gear 35; the rear swing arm 11 is mounted on the base 1 via a pin 29, and the transmission shaft 28 passes through a hole in the base 1 and connects to one end of the pressure block 16; the front end of the rear swing arm 11 mates with the rear end face of the pressure block; the positioning sleeve 30 is sequentially inserted into the holes of the base 1 and the pressure block 16, and the screw 31 is screwed into the threaded hole at the end of the transmission shaft 28; the thread at the end of the screw 21 passes through the rack 26. The threaded hole at end 0 is installed in the groove of the rack 20, and the screw 21 rotates in the groove. The rack 20 is horizontally installed into the hole of the clamp body 2, and the other end of the screw 21 is threadedly connected to the clamp body 2. The upper end of the stud 33 is connected to the threaded hole of the clamp body 2. The gear 35 and the right swing arm 3 are installed on the stud 33 in sequence. The teeth of the gear 35 mesh with the toothed annular groove on the rack 20. The installation structure of the left swing arm 10 is symmetrical with that of the right swing arm 3. The rotating shaft 18 is fixed in the hole below the clamp body 2. The clamp body 2 is mounted on the base 1, and the rotating shaft 18 is rotatably connected to the base. The upper ends of the left swing arm 10 and the right swing arm 3 are respectively fixed with the left movable block 26 and the right movable block 27.

[0006] Beneficial effects: This invention designs a rack with toothed annular grooves. The rotation of the screw drives the rack to move back and forth, simultaneously rotating the two gears on the left and right sides. This, in turn, drives the left and right swing arms and the left and right movable blocks to move synchronously towards the center of the clamping body, making the center position of the part coincide with the center position of the clamping body. This achieves automatic determination of the center position of parts with large dimensional tolerances. At the same time, the layered design of the clamping body and the base makes the determination of the lateral center position of the part and the longitudinal coordinate system direction relatively independent. This avoids the problem of large errors when the perpendicularity error of the lateral and longitudinal surfaces of the part blank is large, which can only be determined by a single direction. Attached Figure Description

[0007] Figure 1 This is the front view of the present invention.

[0008] Figure 2 This is a cross-sectional view along line A-A of the present invention.

[0009] Figure 3 This is a top view of the present invention.

[0010] Figure 4 This is a B-B sectional view of the present invention.

[0011] Figure 5 This is a D-D cross-sectional view of the present invention.

[0012] Figure 6 This is the E-direction view of the present invention.

[0013] Figure 7 This is a diagram of a 40mm wrench.

[0014] Figure 8 This is a C-C sectional view of the present invention.

[0015] Figure 9 This is a schematic diagram of the transmission sleeve 36. Detailed Implementation

[0016] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below.

[0017] The present invention proposes a centering device, comprising a base 1, a clamping body 2, a right swing arm 3, a nut 4, a support 5, a bolt 6, a spring 7, a pressure plate 8, a nut 9, a left swing arm 10, a rear swing arm 11, a spring 12, a washer 13, a nut 14, a support pin 15, a pressure block 16, a first bushing 17, a rotating shaft 18, a second bushing 19, a rack 20, a screw 21, a bolt 22, a washer 23, a positioning sleeve 24, a limit pin 25, a left movable block 26, a right movable block 27, a transmission shaft 28, a pin 29, a positioning sleeve 30, a screw 31, a cotter pin 32, a stud 33, a third bushing 34, a gear 35, a transmission sleeve 36, a washer 37, a nut 38, a screw 39, and a wrench 40.

[0018] like Figure 2 As shown, spring 12 is fitted onto support pin 15, and support pin 15 is inserted into the hole of base 1 from the bottom. Washer 13 and nut 14 are then installed on support pin 15 in sequence to support the rear swing arm.

[0019] like Figure 4 As shown, the pin 29 is sequentially inserted into the holes of the base 1 and the rear swing arm 11, the rear swing arm 11 is mounted on the base 1, the cotter pin 32 is inserted into the hole of the pin 29, and the tail is pried open. The drive shaft 28 is sequentially mounted on the base 1 through the hole on the base 1 and the square hole on the pressure block 16. The rear swing arm 11 has an L-shaped structure, and its front end mates with the rear end face of the pressure block. The positioning sleeve 30 is sequentially inserted into the holes of the base 1 and the pressure block 16, and the screw 31 is screwed into the threaded hole on the end of the drive shaft 28.

[0020] The first bushing 17 is vertically inserted into the hole of the base 1;

[0021] like Figure 2 As shown, the second bushing 19 is horizontally inserted into the hole of the fixture body 2. The thread of the end of the screw 21 is passed through the threaded hole of the end of the rack 20 and installed in the groove of the rack 20. The screw 21 rotates in the groove, the rack 20 is inserted into the hole of the second bushing 19, and the screw 21 is screwed into the threaded hole of the fixture body 2.

[0022] like Figure 5 As shown, the third bushing 34 is installed into the hole of the clamp body 2, and the stud 33 is screwed into the threaded hole of the clamp body 2 so that the boss of the stud 33 rests on the end face of the threaded hole of the clamp body 2. The gear 35 is installed into the hole of the third bushing 34. Then, the transmission sleeve 36 and the right swing arm 3 are installed on the stud 33 in sequence, the washer 37 is installed, and the nut 38 is tightened on the thread of the stud 33 so that the washer 37 is pressed against the boss of the stud 33. The teeth of the gear 35 mesh with the toothed annular groove on the rack 20. The installation of the left swing arm 10 assembly is the same as the installation process of the right swing arm 3.

[0023] Insert the rotating shaft 18 into the hole below the fixture body 2, and fix the rotating shaft 18 onto the fixture body 2 with screws 39. Insert the limit pin 25 into the corresponding hole of the fixture body 2.

[0024] Mount the clamp 2 onto the base 1, insert the outer circle of the rotating shaft 18 into the hole of the second bushing 19, install the left movable block 26, the positioning sleeve 24, and the washer 23 onto the left swing arm 10 in sequence, and fix them with bolts 22 so that the washer 23 presses against the end face of the positioning sleeve 24. Repeat the above steps to install the right movable block 27, the positioning sleeve 24, and the washer 23 onto the right swing arm 3 in sequence; install the nut 4, the support 5, the bolt 6, the spring 7, the pressure plate 8, and the nut 9 onto the base 1 in sequence.

[0025] The working principle and process of this invention are as follows:

[0026] 1. Install the centering device on the machine tool worktable, and after alignment, fix the base 1 to the machine tool worktable with bolts;

[0027] 2. Place the part on the fixture 2, so that the rear end face of the part rests against the limit pin 25. Insert the hexagonal head of the wrench 40 into the inner hexagon of the screw 21. Rotate the screw 21 to push the rack 20 to move backward. The rack 20 pushes the two gears 35 on the left and right sides to rotate synchronously. The gears 35 drive the left swing arm 10 and the right swing arm 3 to rotate through the transmission sleeve 36. The left swing arm 10 and the right swing arm 3 drive the left movable block 26 and the right movable block 27 to move towards the center of the fixture 2 through the positioning sleeve 24, until the positioning arcs on the left movable block 26 and the right movable block 27 are in close contact with the two sides of the part, and the center position of the part is fixed at the center position of the fixture 2.

[0028] 3. Remove the hexagonal head of the wrench 40 from the hexagonal socket of the screw 21 and insert it into the hexagonal socket at the end of the drive shaft 28. Rotate the drive shaft 28, and the square part on the drive shaft 28 will drive the pressure block 16 to rotate. The arc part of the pressure block 16 will drive the rear swing arm 11 to rotate around the pin 29 until the two positioning pins on the rear swing arm 11 contact the rear side of the part. This will push the clamp body 2, which is fixed to the part, to rotate around the rotary shaft 18, so that the rear side of the part is perpendicular to the longitudinal feed direction of the machine tool.

[0029] 4. Tighten nut 9 to clamp the part with pressure plate 8. At this time, the center position of the part in the horizontal direction and the longitudinal coordinate direction are determined, and the part can be processed.

[0030] This invention designs a rack with a toothed annular groove. The rack moves back and forth by rotating a screw, which simultaneously drives the two gears on the left and right sides to rotate. This causes the left and right swing arms and the left and right movable blocks to move synchronously toward the center of the clamping body, so that the center position of the part coincides with the center position of the clamping body, thus realizing the automatic determination of the center position of parts with large dimensional tolerances.

[0031] This invention employs a layered design of the clamping body and the base, enabling the determination of the lateral center position of the part and the longitudinal coordinate system direction to be relatively independent. This avoids the problem that when the perpendicularity error of the lateral and longitudinal surfaces of the part blank is large, the lateral center position and longitudinal coordinate system direction of the part can only be determined by a single direction, resulting in large errors.

[0032] This invention designs a rack with toothed annular grooves. The rotation of a screw drives the rack to move back and forth, simultaneously rotating two gears on the left and right sides. This, in turn, causes the left and right swing arms and movable blocks to move synchronously towards the center of the clamping body, aligning the center of the part with the center of the clamping body. This achieves automatic determination of the center position of parts with large dimensional tolerances. Furthermore, the layered design of the clamping body and the base ensures that the determination of the part's lateral center position and the longitudinal coordinate system direction are relatively independent. This avoids the problem of large errors when the perpendicularity error of the part's blank surface is large, as it can only be determined by a single direction for both the lateral center position and the longitudinal coordinate system direction.

[0033] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A centering device, characterized in that: The system includes a base (1), a clamping body (2), a right swing arm (3), a left swing arm (10), a rear swing arm (11), a rotating shaft (18), a rack (20), a screw (21), a left movable block (26), a right movable block (27), a drive shaft (28), and a gear (35). The rear swing arm (11) is mounted on the base (1) via a pin (29), and the drive shaft (28) passes through a hole on the base (1) and connects to one end of the pressure block (16). The front end of the rear swing arm (11) mates with the rear end face of the pressure block. The positioning sleeve (30) is inserted into the holes of the base (1) and the pressure block (16) in sequence, and the screw (31) is screwed into the threaded hole at the end of the drive shaft (28). The thread at the end of the screw (21) passes through the threaded hole at the end of the rack (20) and is mounted on the rack (28). Inside the groove of 20), the screw (21) rotates within the groove, and the rack (20) is horizontally inserted into the hole of the clamp body (2). The other end of the screw (21) is threadedly connected to the clamp body (2). The upper end of the stud (33) is connected to the threaded hole of the clamp body (2). The gear (35) and the right swing arm (3) are installed on the stud (33) in sequence. The teeth of the gear (35) mesh with the toothed annular groove on the rack (20). The installation of the left swing arm (10) is symmetrical to the installation structure of the right swing arm (3). The rotating shaft (18) is fixed in the hole below the clamp body (2). The clamp body (2) is mounted on the base (1), and the rotating shaft (18) is rotatably connected to the base. The upper ends of the left swing arm (10) and the right swing arm (3) are respectively fixed with the left movable block (26) and the right movable block (27). By rotating the screw (21), the rack (20) is pushed to move backward. The rack (20) pushes the two gears on the left and right sides to rotate synchronously. The two gears drive the left swing arm (10) and the right swing arm (3) to rotate respectively. The left swing arm (10) and the right swing arm (3) drive the left movable block (26) and the right movable block (27) to move towards the center of the clamping body (2) until the positioning arc on the left movable block (26) and the right movable block (27) is in close contact with the two sides of the part. The center position of the part is fixed at the center position of the clamping body (2). Then, the transmission shaft (28) is rotated, and the pressure block (16) is driven to rotate through the transmission shaft (28). The arc part of the pressure block (16) drives the rear swing arm (11) to rotate around the pin shaft (29) until the positioning pin on the rear swing arm (11) contacts the rear side of the part, so that the rear side of the part is perpendicular to the longitudinal feed direction of the machine tool. Finally, the part is clamped by the pressure plate (8). At this time, the center position of the part in the transverse direction and the longitudinal coordinate direction are determined.

2. The centering device according to claim 1, characterized in that: The cotter pin (32) is inserted into the hole at the end of the pin (29) and the tail is pried open.

3. The centering device according to claim 1, characterized in that: The drive shaft (28) passes through the hole on the base (1) and the square hole on the pressure block (16) in sequence.

4. The centering device according to claim 1, characterized in that: The positioning sleeve (30) passes through the base (1) and is fixed to the other end of the pressure block (16).

5. The centering device according to claim 1, characterized in that: The boss of the stud (33) rests on the end face of the threaded hole of the fixture (2).

6. The centering device according to claim 1, characterized in that: The limiting pin (25) is inserted into the corresponding hole of the fixture body (2) to position the rear end face of the part.

7. The centering device according to claim 1, characterized in that: The base has symmetrical pressure plates on the supports on both sides for pressing the workpiece.

8. The centering device according to claim 1, characterized in that: A support pin (15) fitted with a spring (12) is inserted into a hole in the base (1) to support the rear swing arm.

9. The centering device according to claim 1, characterized in that: The base (1) is fixed to the machine tool worktable.

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