Single-drive double-shaft reverse positioning clamp

Abstract

The utility model discloses a single-drive double-shaft reverse type positioning clamp which comprises a rack, the rack is rotationally connected with a main shaft, a left-hand single-thread screw and a right-hand single-thread screw, the main shaft is fixedly connected with an output shaft of a motor through a coupler, and the main shaft is fixedly connected with a first gear and a second gear; the left-hand single-thread screw is fixedly provided with a third gear, the third gear is meshed with the second gear, the right-hand single-thread screw is fixedly provided with a fourth gear, and the fourth gear is meshed with the first gear; the left-handed single-thread screw and the right-handed single-thread screw are both in threaded connection with conveying stand columns, and clamping assemblies used for clamping workpieces are fixedly installed at the top ends of the conveying stand columns. Two parallel guide rails are fixedly installed on the machine frame, and the two sides of the clamping assembly are connected into sliding grooves of the two guide rails in a sliding mode respectively. According to the utility model, the structure is simple, an additional speed reducer is not needed, the precise clamping of a workpiece is realized, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to a clamp, in particular to a single-drive double-axis reverse positioning clamp. Background Art

[0002] In the field of mechanical processing, it is often necessary to perform symmetrical and precise clamping of parts. However, in reality, the clamping effect of precision positioning fixtures with a single drive source and a deceleration property is not ideal. They often have the following problems: 1) Not only is the structure complex, but the drive source involved is also complex, resulting in high prices; 2) an additional deceleration device is required to match the fixture, and the cooperating deceleration device is complex; 3) most existing fixtures use rack and pinion transmission or belt transmission to perform symmetrical and precise clamping. On the one hand, the gap between the rack and pinion leads to errors in transmission efficiency; on the other hand, the flexibility of the transmission belt makes it easy to slip during movement and is easily deformed by cold and hot conditions. Therefore, both rack and pinion transmission and belt transmission have the problem of low clamping accuracy, and belt transmission fixtures have relatively high environmental requirements. It can be seen that the existing precision positioning fixtures with a single drive source and a deceleration property can no longer meet the demand for precise clamping in the field of mechanical processing, which seriously restricts the development of mechanical processing. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a single-drive dual-axis reverse positioning fixture, which not only has a simple structure and does not require an additional deceleration device, but also realizes precise clamping of workpieces.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A single-drive, dual-axis reverse positioning fixture includes a frame, the frame is rotatably connected to a main shaft, a left-handed single-thread screw, and a right-handed single-thread screw, the main shaft is fixedly connected to the output shaft of the motor through a coupling, and the main shaft is fixedly connected to a first gear and a second gear;

[0006] The left-handed single-thread screw is fixedly mounted with a third gear, the third gear is meshed with the second gear, and the right-handed single-thread screw is fixedly mounted with a fourth gear, the fourth gear is meshed with the first gear;

[0007] The left-handed single-thread screw and the right-handed single-thread screw are both threadedly connected to a conveying column, and a clamping assembly for clamping a workpiece is fixedly installed on the top of the conveying column;

[0008] Two mutually parallel guide rails are fixedly installed on the frame, and two sides of the clamping assembly are respectively slidably connected to the sliding grooves of the two guide rails.

[0009] Further, the clamping assembly comprises a sliding disc fixedly installed at the top end of the conveying column, and a clamping frame for clamping the workpiece is fixedly installed on the sliding disc.

[0010] Further, a dust cover is fixedly installed on the rack, and the left-hand single thread screw rod and the right-hand single thread screw rod are located inside the dust cover.

[0011] Further, a counterweight is fixedly installed below the sliding disc, a plurality of through holes are formed in the counterweight, and a guide rod is slidably connected in the through holes and fixedly connected to the two sides of the dust cover.

[0012] Further, one end of the left-hand single thread screw rod and the right-hand single thread screw rod is rotatably connected to the rack through a second bearing, and the other end of the left-hand single thread screw rod and the right-hand single thread screw rod is rotatably connected to the dust cover through a third bearing.

[0013] Further, a bearing end cover is fixedly installed outside the third bearing.

[0014] Further, a first bearing is fixedly installed on the rack, and the main shaft is rotatably connected to the rack through the first bearing.

[0015] Compared with the prior art, the utility model has the following technical effects:

[0016] On the one hand, the main shaft is driven by the motor, the left-hand single thread screw rod and the right-hand single thread screw rod with opposite rotation directions are driven to rotate in the same direction, the conveying columns threadedly connected to the left-hand single thread screw rod and the right-hand single thread screw rod are driven to move towards each other, the clamping assembly is driven to clamp the workpiece, the structure and principle are simple, the cost is low, all the transmission components are rigid components and are not easy to deform, the operation is more stable, the requirement for the environment is low, the power input source is single and stable, so the clamping precision is higher than that of the existing clamp.

[0017] The utility model discloses a dust cover is set up, can effectively prevent dust or sundries from falling on the left-hand single thread screw rod and the right-hand single thread screw rod, improve the service life and clamping precision of the clamp.

[0018] The utility model discloses a set of guide rod is set up, plays the spacing support and the pilot effect to the sliding disc, can promote the sliding disc steady movement, not only reduces the friction between the guide rail and the sliding disc because of the dead weight, and reduces the deformation of the left-hand single thread screw rod and the right-hand single thread screw rod because of the dead weight of the sliding disc, the transmission stand and the card frame, makes the sliding disc can keep the relatively constant stable straight -line motion trajectory, not only improves the clamping precision, and improves the service life of the fixture. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 : the structure diagram of the utility model without dust cover is shown;

[0020] Figure 2 : the local structure diagram of the utility model is shown;

[0021] Figure 3 : the whole structure diagram of the utility model is shown Figure 1 ;

[0022] Figure 4 : the whole structure diagram of the utility model is shown Figure 2 .

[0023] In the drawing: 1, main shaft;2, first gear;3, second gear;4, rack;5, first bearing;6, dust cover;7, bearing end cover;8, guide rod;9, third gear;10, fourth gear;11, sliding disc;12, card frame;13, guide rail;14, left-hand single thread screw rod;15, right-hand single thread screw rod;16, transmission stand. DETAILED DESCRIPTION

[0024] The specific content of the utility model is explained in further detail below in combination with examples.

[0025] As Figures 1 to 4 shown, a single drive double shaft reverse type positioning fixture, including rack 4, main shaft 1, dust cover 6, left-hand single thread screw rod 14 and right-hand single thread screw rod 15;

[0026] A set of first bearing 5 is fixedly installed on the upper surface of the rack 4, and the middle part and one end of the main shaft 1 are respectively assembled in the first bearing 5, so that the main shaft 1 can rotate relative to the rack 4, the main shaft 1 is fixedly connected with the output shaft of the motor through the shaft coupling, and the main shaft 1 is connected with the first gear 2 and the second gear 3 of the same parameter characteristics, and the main shaft is driven to rotate by the motor, so as to drive the first gear 2 and the second gear 3 to rotate;

[0027] A dust cover 6 and a set of second bearings are fixedly mounted on the frame 4, and third bearings are fixedly mounted at relative positions on both sides of the dust cover 6. One end of the left-handed single-thread screw 14 and the right-handed single-thread screw 15 are rotatably connected to the frame 4 through the second bearings respectively, and the other ends of the left-handed single-thread screw 14 and the right-handed single-thread screw 15 are rotatably connected to the dust cover 6 through the third bearing. The third bearing is fixedly mounted with a bearing end cover 7, which can prevent dust from entering the interior of the third bearing. The third bearing and the bearing end cover 7 support the left-handed single-thread screw 14 and the right-handed single-thread screw 15, so that they can rotate smoothly.

[0028] Preferably, the dust cover 6 is fixedly mounted on the frame 4 by bolts;

[0029] The left end of the left-handed single-thread screw 14 is interference-connected with the third gear 9, and the third gear 9 is meshed with the second gear 3. The right end of the right-handed single-thread screw 15 is interference-connected with the fourth gear 10, and the fourth gear 10 is meshed with the first gear 2. The parameter characteristics of the third gear 9 and the fourth gear 10 are the same. When the first gear 2 and the second gear 3 rotate, the fourth gear 10 and the third gear 9 are respectively driven to rotate, thereby driving the left-handed single-thread screw 14 and the right-handed single-thread screw 15 to rotate. Through the transmission of the two sets of gears, the left-handed single-thread screw 14 and the right-handed single-thread screw 15 are driven to rotate, which can play a deceleration role without the need for an additional deceleration device. Not only does it not require an additional deceleration device, but it also simplifies the structure of the deceleration device and reduces the processing cost of the fixture;

[0030] The left-handed single-thread screw 14 and the right-handed single-thread screw 15 are both threadedly connected to a conveying column 16, a sliding disk 11 is fixedly installed on the top of the conveying column 16, and a clamping frame 12 for clamping the workpiece is fixedly installed on the sliding disk 11. The main shaft 1 is driven by a motor to rotate, driving the first gear 2 and the second gear 3 to rotate, thereby rotating the third gear 9 and the fourth gear 10 and driving the left-handed single-thread screw 14 and the right-handed single-thread screw 15 to rotate. Since the threads of the left-handed single-thread screw 14 and the right-handed single-thread screw 15 have opposite rotation directions, they can be driven by the same motor in the same direction to move the two conveying columns 16 towards each other, thereby clamping the workpiece;

[0031] This embodiment uses a main shaft 1 to transmit the output power of the motor to the gear, which in turn drives the left-handed single-thread screw 14 and the right-handed single-thread screw 15 to rotate, ensuring the stability of the input source. Compared with complex dual-input sources and electronically controlled opposing clamping systems, the degree of influence from environmental vibration and other factors is relatively low, thereby improving the clamping accuracy. In addition, the transmission components used are all rigid components. Compared with belt drive clamping, they are less likely to deform under ambient temperature changes or conventional external forces, further improving the clamping accuracy.

[0032] The rack 4 is fixedly provided with two parallel guide rails 13, and the sliding discs 11 are slidably connected to the sliding grooves of the guide rails 13, so that the guide rails 13 support and guide the sliding discs 11;

[0033] The sliding discs 11 are fixedly provided with counterweights below, the counterweights are provided with a plurality of through holes, the through holes are slidably connected with guide rods 8, and the two ends of the guide rods 8 are fixedly connected with the dust covers 6, so that the guide rods 8 guide and support the sliding discs 11 and the transmission columns 16;

[0034] The guide rails 13 and the guide rods 8 can guide the sliding discs 11 to move stably, and the guide rails 13 and the guide rods 8 support the sliding discs 11, so that the deformation of the left-hand single-threaded screw rod 14 and the right-hand single-threaded screw rod 15 caused by the self-weight of the sliding discs 11, the transmission columns 16 and the clamping frames 12 is reduced, the sliding discs 11 keep a relatively constant straight motion track, and the precision of the clamping frames 12 to clamp the workpieces and the service life of the clamps are improved.

[0035] The working principle of the utility model is as follows:

[0036] In use, the motor is started, the motor is used as the only power source, the motor rotates in the forward direction to drive the main shaft 1 to rotate, the main shaft 1 drives the first gear 2 and the second gear 3 to rotate, the first gear 2 drives the fourth gear 10 to rotate, the second gear 3 drives the third gear 9 to rotate, the third gear 9 and the fourth gear 10 rotate in the same direction and at the same time, and the left-hand single-threaded screw rod 14 and the right-hand single-threaded screw rod 15 rotate in the same direction and at the same time, the transmission column 16 connected with the left-hand single-threaded screw rod 14 and the transmission column 16 connected with the right-hand single-threaded screw rod 15 move towards each other, so as to drive the two sliding discs 11 to move towards each other along the guide rails 13 and the guide rods 8, drive the two clamping frames 12 to move close to each other, and clamp the workpiece; when the workpiece needs to be unloaded, the motor reverses, the two transmission columns 16 move away from each other, and the two clamping frames 12 move away from each other, so as to release the workpiece.

Claims

1. A single-drive dual-axis reverse positioning fixture, characterized in that: The machine comprises a frame (4), the frame (4) being rotatably connected to a main shaft (1), a left-handed single-thread screw (14) and a right-handed single-thread screw (15), the main shaft (1) being fixedly connected to an output shaft of a motor via a coupling, and the main shaft (1) being fixedly connected to a first gear (2) and a second gear (3); The left-handed single-thread screw (14) is fixedly mounted with a third gear (9), the third gear (9) is meshed with the second gear (3), and the right-handed single-thread screw (15) is fixedly mounted with a fourth gear (10), the fourth gear (10) is meshed with the first gear (2); The left-handed single-thread screw (14) and the right-handed single-thread screw (15) are both threadedly connected to a transmission column (16), and a clamping assembly for clamping a workpiece is fixedly installed on the top of the transmission column (16); Two mutually parallel guide rails (13) are fixedly mounted on the frame (4), and both sides of the clamping assembly are slidably connected to the sliding grooves of the two guide rails (13).

2. The single-drive dual-axis reverse positioning fixture according to claim 1, characterized in that: The clamping assembly comprises a sliding plate (11) fixedly mounted on the top of a conveying column (16), and a clamping frame (12) for clamping a workpiece is fixedly mounted on the sliding plate (11).

3. The single-drive dual-axis reverse positioning fixture according to claim 2, characterized in that: A dust cover (6) is fixedly mounted on the frame (4), and a left-handed single-thread screw (14) and a right-handed single-thread screw (15) are both located inside the dust cover (6).

4. The single-drive dual-axis reverse positioning fixture according to claim 3, characterized in that: A counterweight is fixedly mounted below the sliding plate (11). The counterweight is provided with a group of through holes. A guide rod (8) is slidably connected through the through holes. The two ends of the guide rod (8) are fixedly connected to the two sides of the dust cover (6) respectively.

5. The single-drive dual-axis reverse positioning fixture according to claim 3 or 4, characterized in that: One end of the left-handed single-thread screw (14) and the right-handed single-thread screw (15) is rotatably connected to the frame (4) via a second bearing, and the other end of the left-handed single-thread screw (14) and the right-handed single-thread screw (15) is rotatably connected to the dust cover (6) via a third bearing.

6. The single-drive dual-axis reverse positioning fixture according to claim 5, characterized in that: A bearing end cover (7) is fixedly mounted on the outer side of the third bearing.

7. The single-drive dual-axis reverse positioning fixture according to claim 1 or 2, characterized in that: The frame (4) is fixedly mounted with a first bearing (5), and the main shaft (1) is rotatably connected to the frame (4) via the first bearing (5).

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