Pneumatic clamp of numerical control machine tool

Abstract

The utility model relates to the field of machine tool clamps, in particular to a numerical control machine tool pneumatic clamp which comprises a positioning block, an expansion block and a chuck of an ok clamp, the positioning block is fixedly connected with a machine tool sliding table, the expansion block is vertically and slidably connected with the positioning block, and the chuck is slidably connected to the inner inclined face of the side, away from the positioning block, of the expansion block. Grooves are upwards formed in the bottom edges of the two sides of the chuck, cushion blocks movably abut against the grooves, and supports movably abut against the bottom ends of the cushion blocks. The clamping head can move in the horizontal direction and the vertical direction, after the clamping head abuts against the side edge of a workpiece, when the expansion block is pressed downwards, the clamping head can extrude the side wall of the workpiece to provide clamping force, meanwhile, the edge of the workpiece is pressed downwards, and the edge warping phenomenon caused by the side clamping force of the workpiece is avoided; according to the device, the original advantage of small size of an ok clamp can be kept, and meanwhile, the stable side clamping characteristic of the frog clamp is also realized.

Description

Technical Field

[0001] The utility model relates to the field of machine tool fixtures, in particular to a pneumatic fixture for a numerical control machine tool. Background Technique

[0002] In machining, for workpieces that are relatively large in volume and inconvenient to be fixed by a vise, a side fixing fixture is usually used. The side fixing fixture is generally divided into two types. One is called a toad clamp in the machining industry. Its characteristic is that the chuck is forced to slide down along the slope by the downward pressure of the screw, so that the chuck abuts against the side of the workpiece to achieve the fixing effect. The other is called an OK fixture. The difference from the toad clamp is that the chuck of the toad clamp moves obliquely downward, while the chuck of the OK fixture moves horizontally. Obviously, while the toad clamp squeezes and fixes the side of the workpiece, it can also provide a downward component force to press the workpiece tightly on the table, while the OK fixture can only provide a horizontal thrust to the workpiece.

[0003] Among the above, although the clamping method of the toad clamp is more stable, the price is that its volume is much larger than that of the OK fixture and it will occupy a relatively large area of the machine tool slide. Therefore, based on the OK fixture, the utility model designs a pneumatic fixture for a numerical control machine tool that has both the clamping effect of the toad clamp and the small size of the OK fixture. Content of the Utility Model

[0004] In view of the problems that in the prior art or the side fixing fixture in the existing technology, the toad clamp has a relatively large volume and occupies a large area of the machine tool slide, and the side fixing stability of the OK fixture is relatively poor compared with the toad clamp during use, the present utility model is proposed.

[0005] Therefore, the purpose of the present utility model is to provide a pneumatic fixture for a numerical control machine tool.

[0006] To solve the above technical problems, the present utility model provides the following technical solution: A pneumatic fixture for a numerical control machine tool, including a positioning block, an expansion block and a chuck of an OK fixture. The positioning block is fixedly connected to the machine tool slide. The expansion block is vertically slidably connected to the positioning block. The chuck is slidably connected to the inner inclined surface on the side of the expansion block away from the positioning block. Grooves are opened upward at both bottom edges of the chuck. A cushion block is movably abutted against the grooves, and the bottom end of the cushion block is movably abutted against a bracket. One end of the bracket is fixedly connected to the positioning block. The cushion block is in a shape like the Chinese character 'yao'. The width of the bottom of the groove is greater than the arc diameter of the end of the cushion block. The bracket is fitted and sleeved with the arc surface of the end of the cushion block.

[0007] The pneumatic fixture for CNC machine tools of the present utility model has at least the following beneficial effects: It can achieve the displacement of the chuck in two directions, horizontal and vertical. After the chuck abuts against the side of the workpiece, when the expansion block presses down, the chuck can not only squeeze the side wall of the workpiece to provide a clamping force, but also press the edge of the workpiece downward, avoiding the warping phenomenon of the workpiece caused by the side clamping force. This device can not only retain the original advantage of the small volume of the ok fixture, but also achieve the stable side clamping characteristics of the toad clamp.

[0008] As a preferred embodiment of the pneumatic fixture for CNC machine tools of the present utility model, wherein: a round hole is provided on the inner wall of one side of the groove close to the expansion block, and a spring and a slider are sleeved in the round hole, and one end of the slider away from the spring abuts against the top of the cushion block.

[0009] As a preferred embodiment of the pneumatic fixture for CNC machine tools of the present utility model, wherein: the top end of the cushion block is inclined away from the expansion block.

[0010] As a preferred embodiment of the pneumatic fixture for CNC machine tools of the present utility model, wherein: flange screws are fixedly connected to the edges of both sides of the chuck located in the groove, and the flange edges of the flange screws cover the top of the cushion block.

[0011] As a preferred embodiment of the pneumatic fixture for CNC machine tools of the present utility model, wherein: one end of the bracket connecting the positioning block is inlaid with the side wall of the positioning block, and the sides of the bracket, the positioning block, the expansion block and the chuck are all vertical and coplanar, and clearance grooves are provided on both sides of the expansion block matching the bracket at the bottom.

[0012] As a preferred embodiment of the pneumatic fixture for CNC machine tools of the present utility model, wherein: push rods are fixedly connected to both sides of the expansion block, and the push rods are horizontally arranged. Half-thread screws are fixedly connected to the tops of both sides of the chuck located on the push rods, and the round rod parts of the push rods are lapped with the half-thread screws.

[0013] As a preferred embodiment of the pneumatic fixture for CNC machine tools of the present utility model, wherein: a clamping plate is fixedly connected to the end of the chuck away from the expansion block, and a tooth groove is horizontally provided on the side of the clamping plate away from the chuck.

[0014] As a preferred embodiment of the pneumatic fixture for CNC machine tools of the present utility model, wherein: a bolt is vertically inserted into the expansion block, and the bottom of the bolt penetrates through the expansion block for connecting the piston rod of the cylinder. Description of the Drawings

[0015] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 It is a structural schematic diagram of a pneumatic fixture for a numerical control machine tool.

[0017] Figure 2 It is Figure 1 structural sectional view of.

[0018] Figure 3 It is Figure 1 structural schematic diagram of the bottom (oblique upward view) of.

[0019] Figure 4 It is Figure 1 structural schematic diagram after partial disassembly.

[0020] Figure 5 It is Figure 4 structural enlarged view at position A in.

[0021] In the figure: 100, positioning block; 101, expansion block; 102, chuck; 103, clamping plate; 104, bolt; 105, spacer block; 106, bracket; 107, spring; 108, slider; 109, flange screw; 110, half-thread screw; 111, lever; 101a, clearance groove; 102a, groove; 102b, round hole. Specific embodiments

[0022] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following will make a detailed description of the specific embodiments of the present utility model in conjunction with the drawings of the specification.

[0023] Embodiment, referring to Figures 1 to 5 , this embodiment provides a pneumatic fixture for a numerical control machine tool.

[0024] As Figure 1 and Figure 2 shown, it includes the positioning block 100, expansion block 101 and chuck 102 of the ok fixture. The positioning block 100 is fixedly connected to the machine tool slide, the expansion block 101 is vertically slidably connected to the positioning block 100, and the chuck 102 is slidably connected to the inner inclined surface on the side of the expansion block 101 away from the positioning block 100. As Figure 4 and Figure 5As shown, grooves 102a are provided upward on both bottom sides of the chuck 102. A cushion block 105 is movably abutted against the grooves 102a, and the bottom end of the cushion block 105 is movably abutted against a bracket 106. One end of the bracket 106 is fixedly connected to the positioning block 100. The cushion block 105 is in a shape like the Chinese character 'yao'. The width of the bottom of the groove 102a is greater than the arc diameter of the end of the cushion block 105. The bracket 106 is fitted and sleeved with the arc surface at the end of the cushion block 105;

[0025] With such a setting, the chuck 102 can be displaced in both horizontal and vertical directions. After the chuck 102 abuts against the side of the workpiece, when the expansion block 101 is pressed down, the chuck 102 can not only squeeze the side wall of the workpiece to provide a clamping force, but also press the edge of the workpiece downward, avoiding the warping phenomenon of the workpiece caused by the side clamping force. This device can not only retain the original advantage of the small volume of the ok fixture, but also realize the stable side clamping characteristic of the toad clamp.

[0026] As Figure 5 shown, the top end of the cushion block 105 is inclined away from the expansion block 101. A round hole 102b is provided on the inner wall of the groove 102a close to the expansion block 101, and a spring 107 and a slider 108 are sleeved in the round hole 102b. The end of the slider 108 away from the spring 107 abuts against the top of the cushion block 105. With such a setting, the spring 107 pushes the slider 108 to provide a pre-pressure for the top end of the cushion block 105, so that when the chuck 102 performs a clamping action and moves horizontally, the cushion block 105 can deflect downward following the chuck 102, leaving space for the downward displacement of the chuck 102.

[0027] As Figure 1 shown, flange screws 109 are fixedly connected to the edges of both sides of the chuck 102 located at the grooves 102a, and the flange edges of the flange screws 109 cover the top of the cushion block 105. With such a setting, together with the bracket 106, it can prevent the cushion block 105 from falling off between the groove 102a and the bracket 106.

[0028] As Figure 3 shown, the end of the bracket 106 connecting to the positioning block 100 is inlaid with the side wall of the positioning block 100, and the sides of the bracket 106, the positioning block 100, the expansion block 101 and the chuck 102 are all vertical and coplanar. Avoidance grooves 101a are provided on both bottom sides of the expansion block 101 matching the bracket 106. With such a setting, the surface of the fixture is flat and beautiful.

[0029] As Figure 1 shown, a clamping plate 103 is fixedly connected to the end of the chuck 102 away from the expansion block 101, and a tooth groove is horizontally provided on the side of the clamping plate 103 away from the chuck 102. With such a setting, when the chuck 102 presses down the edge of the workpiece, slippage between the chuck 102 and the workpiece can be avoided;

[0030] On both sides of the expansion block 101, there are fixed connection rods 111, and the rods 111 are horizontally arranged. On both sides of the chuck 102 and at the top of the rods 111, there are fixed connection half-threaded screws 110, and the round rod part of the rods 111 is lapped with the half-threaded screws 110. With such a setting, when the expansion block 101 moves upward to reset, the rods 111 push the half-threaded screws 110 upward, assisting the chuck 102 to reset upward and separating the tooth grooves of the clamping plate 103 from the workpiece.

[0031] As Figure 2 shown, a bolt 104 is vertically inserted into the expansion block 101, and the bottom of the bolt 104 penetrates through the expansion block 101 for connecting the piston rod of the cylinder. When the cylinder is used for driving, the piston rod of the cylinder is coaxially and threadedly connected with the bolt 104.

[0032] The utility model provides a pneumatic fixture for a numerical control machine tool, especially while retaining the small volume advantage of its ok fixture, it realizes the better side clamping characteristics of a toad clamp. Its working mode is as follows:

[0033] First, the fixture should be fixed in position and in an unlocked state. It is fixedly connected to the machine tool slide table through the positioning block 100, which is responsible for the positioning of the entire fixture. The expansion block 101 is in a high position. The chuck 102 is hung on the rod 111 through the half-threaded screw 110. The top end of the spacer block 105 abuts against the bottom of the groove 102a. The clamping plate 103 on the chuck 102 should be in contact with the side wall of the workpiece.

[0034] By pulling down the bolt 104 with the cylinder, the expansion block 101 is driven to slide vertically downward. The inclined surface of the expansion block 101 slides and presses the chuck 102. The bottom end of the chuck 102 is supported by the spacer block 105, so that the chuck 102 preferentially moves horizontally away from the expansion block 101, increasing the extrusion force of the clamping plate 103 on the side wall of the workpiece. When the chuck 102 undergoes a horizontal displacement, the distance between its groove 102a and the bottom end of the spacer block 105 will increase, and the length of the spacer block 105 is fixed and unchanged. Under the pushing of the spring 107 and the slider 108, the original inclination degree of the spacer block 105 is aggravated. The deflection of the spacer block 105 causes a gap to appear between the top end of the spacer block 105 and the bottom of the groove 102a. This gap provides a moving space for the vertical downward displacement of the chuck 102. At this time, the chuck 102 has already abutted against the workpiece in the horizontal direction, and the expansion block 101 is subjected to the continuous downward pulling force provided by the cylinder. This enables the chuck 102 to transmit the vertical downward component force transmitted by the inclined surface of the expansion block 101 to the edge of the workpiece, and the transverse tooth grooves on the clamping plate 103 provide an anti-slip effect in the vertical direction between the chuck 102 and the workpiece. Finally, the chuck 102 effectively provides a continuous and reliable downward pressure for the workpiece, firmly pressing the workpiece on the machine tool slide table.

[0035] In summary, the fixture provided by the present utility model can achieve the displacement of the chuck 102 in two directions, namely horizontal and vertical. After the chuck 102 contacts the side of the workpiece, when the expansion block 101 is pressed down, the chuck 102 can not only squeeze the side wall of the workpiece to provide a clamping force, but also press the edge of the workpiece downward, avoiding the warping phenomenon of the workpiece caused by the side clamping force. This device can not only retain the original advantage of the small volume of the ok fixture, but also achieve the stable side clamping characteristics of the toad clamp.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A pneumatic fixture for a numerical control machine tool, including a positioning block (100), an expansion block (101) and a chuck (102) of an ok fixture. The positioning block (100) is fixedly connected to the machine tool slide, the expansion block (101) is vertically slidably connected to the positioning block (100), and the chuck (102) is slidably connected to the inner inclined surface on the side of the expansion block (101) away from the positioning block (100), characterized in that: On both bottom sides of the chuck (102), grooves (102a) are provided upward. A cushion block (105) is movably abutted against the grooves (102a), and the bottom end of the cushion block (105) is movably abutted against a bracket (106). One end of the bracket (106) is fixedly connected to a positioning block (100). The cushion block (105) is in a shape of a distorted circle. The width of the bottom of the groove (102a) is greater than the arc diameter of the end of the cushion block (105). The bracket (106) is fitted and sleeved with the arc surface at the end of the cushion block (105).

2. The pneumatic fixture for CNC machine tools according to claim 1, characterized in that: On the inner wall of the groove (102a) close to the expansion block (101), a round hole (102b) is provided. A spring (107) and a slider (108) are sleeved in the round hole (102b). One end of the slider (108) away from the spring (107) abuts against the top of the cushion block (105).

3. The pneumatic fixture for CNC machine tools according to claim 2, characterized in that: The top end of the cushion block (105) inclines in the direction away from the expansion block (101).

4. The pneumatic fixture for a numerical control machine tool according to claim 3, characterized in that: On both sides of the chuck (102) at the edge of the groove (102a), flange screws (109) are fixedly connected, and the flange edge of the flange screw (109) covers the top of the cushion block (105).

5. The pneumatic fixture for a numerical control machine tool according to claim 1, characterized in that: One end of the bracket (106) connecting the positioning block (100) is inlaid with the side wall of the positioning block (100). The sides of the bracket (106), the positioning block (100), the expansion block (101) and the chuck (102) are all vertical and coplanar. On both bottom sides of the expansion block (101), clearance grooves (101a) are provided to match the bracket (106).

6. The pneumatic fixture for a numerically controlled machine tool according to claim 1, characterized in that: On both sides of the expansion block (101), a lever (111) is fixedly connected. The lever (111) is horizontally arranged. On both sides of the chuck (102) at the top of the lever (111), half-thread screws (110) are fixedly connected, and the round rod part of the lever (111) is lapped with the half-thread screw (110).

7. The pneumatic fixture for CNC machine tools according to claim 1, characterized in that: One end of the chuck (102) away from the expansion block (101) is fixedly connected to a clamping plate (103). On the side of the clamping plate (103) away from the chuck (102), a tooth groove is horizontally provided.

8. The pneumatic fixture for a numerically controlled machine tool according to claim 1, wherein: A bolt (104) is vertically inserted into the expansion block (101). The bottom of the bolt (104) penetrates through the expansion block (101) to connect the piston rod of a cylinder.

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