Sand core clamp capable of accurately positioning

Abstract

The utility model discloses a sand core fixture capable of accurately positioning, which comprises a fixture body, two clamping arms symmetrically arranged on the fixture body, a first driving mechanism for driving the two clamping arms to move oppositely or oppositely, clamping plates rotationally mounted at the lower parts of the clamping arms, and a second driving mechanism for driving the two clamping plates to rotate, the positioning mechanism is used for positioning the two rotated clamping plates and comprises positioning assemblies which are arranged on the clamping arms and correspond to the clamping plates, and each positioning assembly comprises a positioning part and a positioning driving part which is in transmission connection with the positioning part; and the positioning part is pressed on the clamping plate under the driving of the positioning driving part. The sand core clamp capable of accurately positioning, provided by the utility model, can be used for guiding the rotated clamping plate, so that the angular deviation of a sand core is adjusted, and the problems of toppling and the like when the sand core is placed are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of casting, and particularly relates to a precisely positioned sand core clamp. Background Art

[0002] During the core making process of the sand core, the robot or manipulator operates the workpiece sand core through the fixture, dips the fixture sand core into the coating, and then shakes off the coating. Finally, the sand core is placed on the core drying tray. During the sand core coating process, the sand core needs to be rotated 360 degrees to make its coating uniform.

[0003] Chinese patent CN101412219A discloses a synchronous clamp, which includes a clamp body, two clamping arms installed at the bottom of the clamp body, and a clamping plate installed at the bottom of the two clamping arms via a rotating shaft. The two clamping arms can move relative to or away from each other on the clamp body to clamp or release the workpiece. A drive motor is installed on one of the clamping arms, and a drive shaft connected to the drive motor is installed between the two clamping arms. The rotating shaft is connected to the drive shaft via a sprocket and a chain.

[0004] The clamp of the above structure adopts sprocket chain transmission. Since there is a gap between the sprocket chain and the chain is easy to loosen after long-term use, the rotation accuracy of the clamping plate is affected, and the clamping plate is not rotated into place, resulting in damage to the sand core when the clamp clamps the sand core. When placing the sand core, the angle of the sand core deviates, resulting in unstable placement of the sand core and tipping over.

[0005] In order to solve the above problems, latch cylinders are provided on both sides of the clamping plate on the clamping arm, and the clamping plate is positioned by extending the latch cylinders into the positioning holes on the clamping plate. However, there is a deviation in the structure that drives the clamping plate to rotate, and the paint easily enters the positioning holes, so that the latch cylinders cannot be positioned in the positioning holes on the clamping plate, resulting in inaccurate positioning. Utility Model Content

[0006] Based on the above problems, the purpose of this utility model is to provide a precisely positioned sand core clamp that can guide the clamping plate after rotation, thereby reducing the angular deviation of the sand core and avoiding the problem of damage to the sand core such as tipping when placing the sand core.

[0007] In order to overcome the deficiencies of the prior art, the technical solution provided by the present invention is:

[0008] A precisely positioned sand core fixture comprises a fixture body, two clamping arms symmetrically arranged on the fixture body, a first drive mechanism for driving the two clamping arms to move relative to or away from each other, a clamping plate rotatably mounted at the bottom of each clamping arm, and a second drive mechanism for driving the two clamping plates to rotate, and further comprising:

[0009] The positioning mechanism is used to position the two clamping plates after rotation, including a positioning assembly arranged on each clamping arm corresponding to the clamping plate, the positioning assembly including a positioning component and a positioning drive component transmission-connected to the positioning component, and the positioning component is pressed against the clamping plate under the drive of the positioning drive component.

[0010] In one embodiment, the positioning assembly is disposed above the clamping plate.

[0011] In one embodiment, the positioning component is a positioning block or a positioning rod assembly.

[0012] In one embodiment, the positioning rod assembly includes a connecting block connected to the positioning drive member and at least two positioning rods fixed on the connecting block, and the at least two positioning rods are arranged at intervals.

[0013] In one embodiment, the upper end of the positioning rod is fixed on the connecting block and extends in a vertical direction.

[0014] In one embodiment, the positioning drive member is a pneumatic cylinder or a hydraulic cylinder.

[0015] In one embodiment, the first driving mechanism includes a gear rotatably arranged on the clamp body, two sliders slidably arranged on the clamp body, a rack installed on each slider and meshing with the gear, and a driving member driving one of the sliders to move, and the two clamping arms are respectively fixedly connected to the two sliders.

[0016] In one embodiment, the driving member is a cylinder.

[0017] In one embodiment, the second driving mechanism includes a transmission shaft rotatably arranged on the clamp body, a motor driving the transmission shaft to rotate, two driving wheels installed on the transmission shaft, a driven wheel installed on the rotating shaft of the clamping plate, and a transmission belt connecting the driving wheel and the driven wheel.

[0018] In one embodiment, the driving wheel and the driven wheel are sprockets, and the transmission belt is a chain.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] 1. The positioning component is driven by the positioning drive to move toward the clamping plate and press it against the clamping plate to guide the clamping plate and adjust the deviation of the clamping plate during rotation, thereby reducing the angular deviation of the sand core after rotation and avoiding the problem of tipping, rubbing and other damage to the sand core when placing the sand core in the next process;

[0021] 2. The positioning component is pressed against the clamping plate under the drive of the positioning drive, and the rotating shaft of the clamping plate is not subjected to force, thus avoiding the problem that the rotating shaft is subjected to force and affects its strength and rotation accuracy due to the use of two latch cylinders;

[0022] 3. The positioning components are used to press and position the paint, so there will be no problem of positioning stuck due to paint entering the positioning hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is one of the structural schematic diagrams of an embodiment of a precisely positioned sand core fixture of the present utility model;

[0025] Figure 2 This is the second structural diagram of the embodiment of the utility model;

[0026] Figure 3 This is one of the schematic diagrams of the state in which the clamping plate rotates with deviation in the embodiment of the present utility model;

[0027] Figure 4 This is a second schematic diagram of a state in which the clamping plate rotates with deviation in an embodiment of the present utility model;

[0028] Figure 5 This is one of the state diagrams of the positioning mechanism in the embodiment of the present utility model;

[0029] Figure 6 This is the second schematic diagram of the state of the positioning mechanism in the embodiment of the present utility model;

[0030] in:

[0031] 1. Fixture body;

[0032] 2. Clamp arm;

[0033] 3. Clamping plate;

[0034] 4. Driving parts;

[0035] 5. Drive shaft;

[0036] 6. Motor;

[0037] 7. Driven wheel;

[0038] 8. Transmission belt;

[0039] 9. Positioning assembly; 9-1. Positioning drive member; 9-2. Connecting block; 9-3. Positioning rod;

[0040] 10. Rotating shaft. DETAILED DESCRIPTION

[0041] The above scheme is further described below with reference to specific examples. It should be understood that these examples are intended to illustrate the present invention and are not intended to limit the scope of the present invention. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer. The implementation conditions not specified are generally those used in routine experiments.

[0042] See also Figure 1 and Figure 2 The utility model is a precisely positioned sand core clamp, comprising a clamp body 1, two clamping arms 2 symmetrically arranged on the clamp body 1, a first driving mechanism for driving the two clamping arms 2 to move relative to or away from each other, a clamping plate 3 rotatably installed at the bottom of each clamping arm 2, and a second driving mechanism for driving the two clamping plates 3 to rotate.

[0043] The first driving mechanism includes a gear rotatably arranged on the clamp body 1, two sliders slidably arranged on the clamp body 1, a rack installed on each slider and meshing with the gear, and a driving member 4 that drives one of the sliders to move. The two clamping arms 2 are respectively fixedly connected to the two sliders, wherein the driving member 4 is a cylinder, which is driven by the cylinder to realize the synchronous relative or opposite movement of the two clamping arms 2. One of the sliders is driven to move by the cylinder, and the rack connected to the slider moves to drive the gear to rotate, thereby driving the other rack to move, and then driving the clamping arm 2 connected to the other rack to move.

[0044] The second driving mechanism includes a transmission shaft 5 rotatably arranged on the clamp body 1, a motor 6 that drives the transmission shaft 5 to rotate, two driving wheels installed on the transmission shaft 5, a driven wheel 7 installed on the rotating shaft 10 of the clamping plate 3, and a transmission belt 8 connecting the driving wheel and the driven wheel 7, wherein the driving wheel and the driven wheel 7 are sprockets, the transmission belt 8 is a chain, the driving wheel and the driven wheel 7 are respectively arranged at the upper and lower parts of the inside of the clamping arm 2, and the chain is also arranged inside the clamping arm 2.

[0045] Since there is a gap between the sprocket chain and the chain is easy to loosen after long-term use, the rotation accuracy of the clamping plate 3 is affected, so that the clamping plate 3 cannot rotate into place (such as Figure 3 and Figure 4 As shown), in order to position the two clamping plates 3 after rotation, a positioning mechanism is also provided, which includes a positioning assembly 9 arranged on each clamping arm 2 corresponding to the clamping plate 3, each positioning assembly 9 includes a positioning component and a positioning drive 9-1 that is transmission-connected to the positioning component, and the positioning component is pressed against the clamping plate 3 under the drive of the positioning drive 9-1.

[0046] In this example, the positioning assembly 9 is arranged above the clamping plate 3. Since the clamping plate 3 is arranged in the vertical direction to clamp the sand core from the side, the positioning assembly 9 is arranged above the clamping plate 3, and the clamping plate 3 can be pressed from above to guide it.

[0047] The positioning drive 9-1 can be a pneumatic cylinder or a hydraulic cylinder, and the positioning component can be a positioning block or a positioning rod assembly. The positioning drive 9-1 drives the positioning component to move toward the clamping plate 3 to press the clamping plate 3. When the positioning component is a positioning block, the positioning block is connected to the power output end of the positioning drive 9-1.

[0048] In this example, the positioning component is a positioning rod assembly, which includes a connecting block 9-2 connected to the positioning drive member 9-1 and two positioning rods 9-3 fixed on the connecting block 9-2. The two positioning rods 9-3 are arranged at intervals and extend in the vertical direction. For example, they can be arranged on both sides of the length direction of the clamped surface of the clamping plate 3. It should be understood that more than two positioning rods 9-3 can be set as needed, and the present utility model does not impose any restrictions.

[0049] After the fixture drives the sand core to rotate 360 ​​degrees, the position of the clamping plate deviates, such as Figure 3 As shown, the distances between the two positioning rods 9-3 and the upper end surface of the clamping plate 3 are different, such as Figure 5 and Figure 6 As shown, the positioning drive 9-1 drives the two positioning rods 9-3 to press against the clamping plate, and the clamping plate 3 rotates and is guided.

[0050] The working principle of this utility model is:

[0051] The two clamping plates 3 of the fixture clamp the sand core and place the sand core in the coating pool. During the sand core coating process, the sand core needs to be rotated 360 degrees to make the coating uniform. After the coating is completed, there will be a certain deviation in the rotation angle of the two clamping plates 3. The positioning drive part 9-1 drives the positioning component to move toward the upper end of the clamping plate 3 and press it on the clamping plate 3, thereby guiding the clamping plate 3 and then guiding the sand core, making it easier to place the sand core on the core drying tray for drying.

[0052] In summary, the fixture can guide the rotated clamping plate, reduce the angle deviation of the sand core, facilitate the placement of the painted sand core, and avoid problems such as tipping over and sand rubbing on the sand core.

[0053] The above examples are intended only to illustrate the technical concepts and features of this utility model. Their purpose is to enable those familiar with the art to understand the content of this utility model and implement it accordingly. They are not intended to limit the scope of protection of this utility model. Any equivalent changes or modifications based on the spirit of this utility model shall be included in the scope of protection of this utility model.

Claims

1. A precisely positioned sand core fixture comprising a fixture body, two clamping arms symmetrically arranged on the fixture body, a first drive mechanism driving the two clamping arms to move relative to or away from each other, a clamping plate rotatably mounted at the bottom of each clamping arm, and a second drive mechanism driving the two clamping plates to rotate, characterized in that: Also includes: The positioning mechanism is used to position the two clamping plates after rotation, including a positioning assembly arranged on each clamping arm corresponding to the clamping plate, the positioning assembly including a positioning component and a positioning drive component transmission-connected to the positioning component, and the positioning component is pressed against the clamping plate under the drive of the positioning drive component.

2. The precise positioning sand core fixture according to claim 1, characterized in that: The positioning assembly is arranged above the clamping plate.

3. The precise positioning sand core fixture according to claim 2, characterized in that: The positioning component is a positioning block or a positioning rod assembly.

4. The precise positioning sand core fixture according to claim 3, characterized in that: The positioning rod assembly includes a connection block connected to the positioning drive member and at least two positioning rods fixed on the connection block, and the at least two positioning rods are arranged at intervals.

5. The precise positioning sand core fixture according to claim 4, characterized in that: The upper end of the positioning rod is fixed on the connecting block and extends in a vertical direction.

6. The precise positioning sand core fixture according to claim 1, characterized in that: The positioning drive member is a pneumatic cylinder or a hydraulic cylinder.

7. The precise positioning sand core fixture according to claim 1, characterized in that: The first driving mechanism includes a gear rotatably arranged on the clamp body, two sliders slidably arranged on the clamp body, a rack installed on each slider and meshing with the gear, and a driving member driving one of the sliders to move, and the two clamping arms are respectively fixedly connected to the two sliders.

8. The precise positioning sand core fixture according to claim 7, characterized in that: The driving member is a cylinder.

9. The precise positioning sand core fixture according to claim 1, characterized in that: The second driving mechanism includes a transmission shaft rotatably arranged on the clamp body, a motor driving the transmission shaft to rotate, two driving wheels installed on the transmission shaft, a driven wheel installed on the rotating shaft of the clamping plate, and a transmission belt connecting the driving wheel and the driven wheel.

10. The precise positioning sand core fixture according to claim 9, characterized in that: The driving wheel and the driven wheel are sprockets, and the transmission belt is a chain.

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