Avoidance type machine tool structure for fixing main shaft

Abstract

The invention relates to the technical field of machine tool auxiliary structures, in particular to an avoiding type machine tool structure for fixing a main shaft, which comprises a fixing unit for clamping one end of the main shaft, a disc body and a plurality of pressing groups, and the pressing groups are distributed on the end surface of the disc body around the axis of the disc body. The plurality of pressing groups can be close to or separated from each other, and each pressing group comprises a plurality of roller bodies; the main shaft is fixed through the pressing sets with the roller bodies, it can be guaranteed that the main shaft is allowed to rotate under the condition that the pressing sets are static, so that the machining requirement is met, meanwhile, the gap between every two adjacent pressing sets can be used for allowing a tool on a machine tool to penetrate through, and the machining efficiency is improved. Therefore, part of the main shaft shielded among the multiple pressing sets is machined, the mutual avoiding mode of the pressing sets and the cutter is achieved, the situation that the main shaft needs to be machined by changing the direction like a traditional mode is avoided, the machining mode is simplified, and machining convenience is improved.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool auxiliary structures, and in particular to a machine tool structure with an avoidance type fixed spindle. Background Art

[0002] The spindle is a key component in machine tools or similar equipment. It is a core component used to mount workpieces or tools and can drive them to rotate. In mechanical processing, the quality of the spindle directly affects important indicators such as processing accuracy, efficiency, and surface quality.

[0003] The spindle is usually made of high-strength alloy steel and is precision machined and heat treated under constant temperature and humidity conditions to ensure that it has sufficient rigidity and precision. Depending on different application requirements, the design and configuration of the spindle will also be different. For example, on a CNC machine tool, the spindle may need to support high-speed operation while also having good dynamic response performance and thermal stability to ensure long-term reliability.

[0004] At present, the processing of the spindle is completed on a high-precision machine tool. The spindle is clamped and fixed by a chuck or other structure on the machine tool, and the spindle is rotated, and then the spindle is processed in conjunction with a tool on the machine tool. However, the existing chuck structures on the market have some shortcomings in practical applications. For example, when the chuck is clamping the spindle in real time, the spindle clamping position will be blocked by the chuck and the synchronous rotation will cause the tool to be unable to move to the clamping position, resulting in the tool being unable to perform processing on this position of the spindle. The spindle needs to be flipped over and clamped by using other positions on the spindle to expose the original clamping position for processing. This undoubtedly makes the processing extremely inconvenient. In addition, since the clamping position on the spindle is fixed, when the spindle is rotating, the clamping position will produce indentations and damage due to long-term force. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a machine tool structure with an avoidance fixed spindle, and the specific technical solution adopted is: According to a first aspect of the present invention, there is provided a machine tool structure with an avoidance fixed spindle, which is installed on a machine tool to fix the spindle, and comprises: A fixing unit clamps one end of the spindle, comprising a disc and a plurality of pressing groups, the plurality of pressing groups are distributed on the end surface of the disc around the axis of the disc, the plurality of pressing groups can be close to or separated from each other, the pressing group comprises a plurality of rollers, the rollers press and fix the spindle, and the rollers rotate and drive the spindle to rotate at least in a partial range where the rollers move; A lifting unit, for lifting the other end of the main shaft; A power unit, providing power for the movement of the roller; Wherein, the disc body and the lifting unit are relatively fixed on the machine tool, and the power unit is arranged on the disc body.

[0006] In some embodiments of the present invention, the number of the pressing groups is at least three, and the coverage area in the circumferential direction of the disk body is greater than a semicircle. The number of the rollers in the pressing group is at least two, and the axes of the rollers are parallel to each other.

[0007] In some embodiments of the present invention, the pressing group moves in a radial direction along the end surface of the disk body.

[0008] In some embodiments of the present invention, the pressing group further includes a side pressing portion, and the side pressing portion positions the main shaft in the direction of its own axis; The side pressure portion includes two support bodies, and a plurality of rolling bodies in contact with the main shaft are arranged on the support bodies.

[0009] In some embodiments of the present invention, the rolling body is in the shape of a frustum, and when the roller body is in the working position, the tip of the cone where the rolling body is located coincides with the axis of the disk body.

[0010] In some embodiments of the present invention, the pressing group further comprises a moving seat; One of the support bodies in the side pressure portion is fixed on the corresponding moving seat, and the other support body moves along the vertical connection direction between the two support bodies and limits the position of the main shaft in the direction of its own axis.

[0011] In some embodiments of the present invention, a plurality of tubes are inserted into a support body fixed on the movable seat in the side pressure portion, each roller body is fixed to a corresponding end of the tube body, the power unit drives the roller body to rotate through the tube body, a pulling column is slidably inserted in each tube body, the pulling column passes through the corresponding roller body and is fixed on another support body, and the power unit drives the corresponding support body to move through the pulling column.

[0012] In some embodiments of the present invention, the disc is hollow; The power unit includes a moving ring slidably located inside the disk body and an oil cylinder located inside the disk body and providing power for the movement of the moving ring. The moving ring is transmission-connected to each of the moving seats. When the moving ring moves, several moving seats move closer to or away from each other. The moving ring is coaxial with the disk body and moves along its own axis. The end surface of the moving ring facing the moving seat is set as a conical surface, and the end surface of the moving seat facing the moving ring is set as a slope surface used in conjunction with the conical surface of the moving ring.

[0013] In some embodiments of the present invention, the power unit also includes a pull ring located on the inner side of the movable ring and connected to each of the pull columns, the pull ring is connected to the fixed end of each of the cylinders via a connecting frame, the fixed end of the cylinder is connected to the disk body via an elastomer, the elastomer provides elastic supporting force for the cylinder, and the connecting frame is slidably disposed in the disk body.

[0014] In some embodiments of the present invention, a frame is provided on the outside of the disk body to support the disk body, the disk body is relatively fixed on the machine tool through the frame, the disk body rotates on the frame, and a second motor and a third transmission wheel are provided on the frame to provide power for the rotation of the disk body.

[0015] The beneficial effects of the present invention are: By using several pressing groups containing rollers to fix the main shaft, it can be ensured that the pressing group allows the main shaft to rotate when it is stationary, thereby meeting the processing requirements. At the same time, this method can use the gap between two adjacent pressing groups to allow the tool on the machine tool to pass through, so as to process the part of the main shaft blocked by multiple pressing groups, and realize the mutual avoidance of the pressing group and the tool. It is not necessary to change the orientation of the main shaft for processing as in the traditional method, which simplifies the processing method and improves the processing convenience. In addition, this method avoids the risk of indentation and damage at the clamping position of the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure from another perspective; Figure 3 is a schematic diagram of an exploded structure of a fixing unit in an embodiment of the present invention; Figure 4 is a schematic diagram of the explosion structure of the power unit in an embodiment of the present invention; Figure 5 is a schematic structural diagram of a mobile seat in an embodiment of the present invention; Figure 6 It is a schematic diagram of the structure of the oil cylinder and the oil supply and discharge circuits in an embodiment of the present invention.

[0018] Reference numerals: 100, spindle; 200, fixed unit; 201, plate; 202, long hole; 203, movable seat; 204, roller body; 205, support body; 206, rolling body; 207, clamping plate 1; 208, clamping plate 2; 209, tube body; 210, pull column; 300, lifting unit; 400, power unit; 401, moving ring; 402, oil cylinder; 403, pull ring; 404, connecting frame; 405, elastic body; 406, oil supply and discharge circuit; 407, transmission ring; 408, first motor; 409, first transmission wheel; 410, second transmission wheel; 500, frame; 501, second motor; 502, third transmission wheel. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] like Figures 1 to 5 As shown, a machine tool structure of an avoidance fixed spindle of the present invention is installed on a machine tool to fix the spindle 100, including: The fixing unit 200 clamps one end of the main shaft 100, and includes a disc 201 and a plurality of pressing groups, which are distributed on the end surface of the disc 201 around the axis of the disc 201, and the plurality of pressing groups can be close to or separated from each other. The pressing group includes a plurality of rollers 204, which squeeze and fix the main shaft 100, and the rollers 204 rotate at least in a partial range where the rollers 204 move and drive the main shaft 100 to rotate. A lifting unit 300 is used to lift the other end of the spindle 100; A power unit 400 provides power for the movement of the roller 204; The disc body 201 and the lifting unit 300 are relatively fixed on the machine tool, and the power unit 400 is arranged on the disc body 201 .

[0021] By using the fixing unit 200 and the lifting unit 300, the two ends of the main shaft 100 can be supported and fixed. Of course, the lifting unit 300 mainly plays an auxiliary role. In some embodiments, the lifting unit 300 may not be set, or a tugboat may be directly used to lift the end of the main shaft 100, or a plurality of tugboats may be distributed in a ring around the end of the main shaft 100 and clamp the main shaft 100, etc., which will not be described in detail here; The fixing unit 200 and the lifting unit 300 need to be installed on the machine tool and used in conjunction with the tool and other structures on the machine tool; When the spindle 100 is being fixed, the power unit 400 can push the multiple pressing groups to approach each other, and the multiple pressing groups clamp and fix one end of the spindle 100 between them, and use the self-rotation of the roller body 204 to drive the spindle 100 to rotate and achieve the purpose of processing. At this time, the position of the roller body 204 remains unchanged, that is, the gap position between the two adjacent pressing groups does not change, and the tool on the machine tool can extend to the outer wall of the spindle 100 through the gap to achieve the purpose of processing, thereby achieving the avoidance work between the tool and the pressing group, which not only ensures the stability and firmness of the clamping, but also can achieve the purpose of exposing and processing the clamping position or the blocked part of the clamping position close to the side of the disk body 201; In actual use, the size of the gap between two adjacent pressure groups, the distribution position relationship between multiple pressure groups, the position of the gap for the tool to pass through, etc. can all be set as needed, and because there are multiple gaps, the tool can be allowed to achieve the purpose of processing in the gaps at different positions. Since the position of the pressure group does not change when clamping the spindle 100, there will be no collision between the pressure group and the tool, and the avoidance effect is achieved. The setting of the disk body 201 is mainly to provide installation positions and axis references for multiple pressure groups. That is, when the spindle 100 is processed, in order to improve the processing accuracy, the position of the spindle 100 can be limited by the axis position of the disk body 201, so that when the multiple pressure groups clamp the spindle 100, the axis of the disk body 201 and the spindle 100 axis coincides; the movement form of the pressing group on the end face of the disk body 201 can be synchronous movement or asynchronous movement, that is, as long as the spindle 100 can be clamped at a position coaxial with the disk body 201; the movement form of the pressing group when approaching or moving away from the axis of the disk body 201 can be along the radial direction of the end face of the disk body 201, arc movement on the end face of the disk body 201, curved movement and other forms of movement, which are all within the scope of protection of this case, as long as the effect of this case can be achieved, it will not be repeated here. Of course, in actual use, it is generally adopted in the form of a chuck, that is, the pressing group moves on the end face of the disk body 201 along the radial direction of the end face of the disk body 201, and in order to facilitate the positioning of the axis of the spindle 100, multiple groups of pressing groups will adopt a synchronous movement mode; When the spindle 100 is assembled to the spindle box or other positions, it needs to be assembled through the flange on the spindle 100. There is a certain distance between the flange and the end face of the spindle 100. This area will be blocked by the chuck in the traditional processing method, so it is not easy to process. In this case, the tool can be allowed to process this area by adopting an avoidance method; in order to avoid the pressure group from blocking this area, the fixing area of ​​the pressure group to the spindle 100 can be set on the flange or other positions that do not affect the processing. In actual use, since the accuracy requirement of the flange position is relatively low, the fixing position is generally set on the flange, that is, the roller body 204 clamps and fixes the outer wall of the flange circumference; It should be noted that, since the roller body 204 needs to drive the main shaft 100 to rotate, the axis of the roller body 204 is parallel to the axis of the main shaft 100, and the multiple pressing groups are distributed in a ring around the axis of the disc body 201; By using several pressing groups containing rollers 204 to fix the spindle 100, it can be ensured that the pressing group allows the spindle 100 to rotate when it is stationary, thereby meeting the processing requirements. At the same time, this method can utilize the gap between two adjacent pressing groups to allow the tool on the machine tool to pass through, so as to process the part of the spindle 100 blocked between multiple pressing groups, and realize the mutual avoidance of the pressing group and the tool. It is not necessary to change the orientation of the spindle 100 for processing as in the traditional method, thereby simplifying the processing method and improving the processing convenience. In addition, this method avoids the risk of indentation and damage at the clamping position of the spindle 100.

[0022] Optimized in the above implementation, the number of pressing groups is at least three, and the coverage in the circumferential direction is greater than a semicircle, the number of rollers 204 in the pressing group is at least two, and the axes of the rollers 204 are parallel to each other; by setting the number of pressing groups and the coverage, the spindle 100 can be stabilized and centered. Of course, multiple pressing groups can be evenly or unevenly distributed in the circumferential direction, as long as sufficient gaps can be provided for the tool to pass through. If there is a large gap between two adjacent pressing groups and other gaps are small, the position with the larger gap can be set as the common or basic processing position; the number of rollers 204 is set so that there are more contact positions between the pressing group and the spindle 100 to improve the stability of clamping, and can reduce the force between each roller 204 and the spindle 100, so as to facilitate the protection of the spindle 100. Of course, the number of rollers 204 cannot affect the size of the gap between two adjacent pressing groups; the axes of several rollers 204 are parallel, which can allow at least one roller 204 to provide power for the rotation of the spindle 100.

[0023] Furthermore, the pressing group moves along the radial direction of the end face of the disk body 201; by enabling each pressing group to move along the radial direction of the end face of the disk body 201, it is convenient to synchronously control the moving position, speed, etc. of the disk body 201, thereby facilitating the positioning of the axis of the spindle 100. At the same time, this movement mode of the pressing group is more convenient for processing the disk body 201. Compared with other movement modes such as curves, arcs, and inclinations that cause the processing of the disk body 201 to be difficult and costly, the advantages of this method are more prominent and obvious.

[0024] Since the roller 204 in the pressing group can only fix the circumferential direction of the main shaft 100, and the roller 204 rotates relative to the main shaft 100, it cannot limit the axial direction of the main shaft 100. Here, some special settings are added to achieve this limitation function, such as Figure 5As shown, the pressing group also includes a side pressing part, which positions the main shaft 100 in the direction of its own axis; The side pressure part includes two support bodies 205, and a plurality of rolling bodies 206 in contact with the main shaft 100 are arranged on the support bodies 205; The side pressure part limits the axial direction of the main shaft 100 through the rolling body 206. The specific limiting position is generally located on the two end surfaces of the flange on the main shaft 100, so that it will not interfere with the processing position of the main shaft 100. Here, the support body 205 mainly supports a number of rolling bodies 206. The support body 205 can adopt a plate, frame, rack and other structural methods, and the rolling body 206 can adopt a ball, column, cone and other structural methods, which are all within the protection scope of this case; using the above-mentioned structural method, the axial direction of the main shaft 100 can be limited, and the friction between the side pressure part and the main shaft 100 can be reduced; It should be pointed out here that the rolling body 206 can be installed on the support body 205 through structures such as bearings, copper sleeves, and clamping wheels. As long as the rolling body 206 can rotate on the support body 205 and the rolling body 206 can play an anti-friction effect, the specific installation method is within the protection scope of this case.

[0025] like Figure 5 As shown, the shape of the rolling body 206 is a frustum, and when the roller body 204 is in the working position, the tip of the cone where the rolling body 206 is located coincides with the axis of the disc body 201; since the above-mentioned structural mode is directly related to the layout mode of the plurality of rolling bodies 206, there is no limitation on the layout mode of the plurality of rolling bodies 206 on the support body 205, that is, any layout mode that meets the above-mentioned requirements is acceptable and is within the protection scope of this case; using this structural mode, the rotation linear velocity of each location on the outer wall of the rolling body 206 can be limited, that is, when the roller body 204 is When the main shaft 100 is fixed, the rotational linear velocity of any position on the main shaft 100 in contact with the outer wall of the rolling body 206 can be the same as the rotational linear velocity of the rolling body 206 itself, so that the rolling body 206 and the main shaft 100 can move relative to each other synchronously, and no relative friction will be generated between a certain position on the rolling body 206 and the main shaft 100; this arrangement can also reduce the layout restrictions on the plurality of rolling bodies 206 on the support body 205, that is, the plurality of rolling bodies 206 can be arranged in a staggered manner, in an arc shape, etc., which can meet the effect of not generating relative friction; It should be pointed out here that, except for the arrangement in which the plurality of rolling bodies 206 on the support body 205 are arranged in an arc shape, and the center of the arc coincides with the axis of the disk body 201, other layout methods will cause the shapes and sizes of the plurality of rolling bodies 206 to be inconsistent. In some cases, it is permissible to adopt a method in which the shapes and sizes of the plurality of rolling bodies 206 are different. In the commonly used method, in order to facilitate processing and reduce costs, the plurality of rolling bodies 206 will be processed in the same structure and size, which will not be elaborated here.

[0026] The specific assembly method of the support body 205 and the rolling body 206 is as follows: Figure 5 As shown, the support body 205 includes a clamping plate 1 207 and a clamping plate 208, the center of the rolling body 206 is located between the clamping plate 1 207 and the clamping plate 208, and the clamping plate 1 207 and the clamping plate 208 are both provided with notches, and at least part of the outer wall of the rolling body 206 is exposed outside the support body 205 through the notches, and the clamping plate 1 207 and the clamping plate 208 are tightly connected; in this way, the clamping plate 1 207 and the clamping plate 208 can achieve the effect of supporting and fixing the rolling body 206, ensuring that the rolling body 206 can In order to realize the positioning limit of the rolling body 206, the notch needs to be opened in an arc shape, that is, the outer wall of the rolling body 206 is wrapped and limited by the arc surface, and only part of the outer wall of the rolling body 206 is allowed to be exposed outside the support body 205; this docking and clamping fixing method can limit most of the rolling body 206, thereby providing a more secure fastening effect for the rolling body 206, and the rotation stability of the rolling body 206 is stronger, and the assembly is more convenient.

[0027] To achieve a tight connection between the first clamp plate 207 and the second clamp plate 208, specifically, the first clamp plate 207 and the second clamp plate 208 are relatively fixed by at least one of bolts, welding, connectors, and clamping.

[0028] Since the two support bodies 205 in the side pressure portion need to limit the axial direction of the main shaft 100, the two support bodies 205 need to be able to move closer to or farther from each other. Figure 5 As shown, the pressing group also includes a moving seat 203; one support body 205 in the side pressing part is fixed on the corresponding moving seat 203, and the other support body 205 moves along the vertical line between the two support bodies 205 and limits the position of the spindle 100 in the direction of its own axis; in this way, when the spindle 100 is initially clamped, the flange position of the spindle 100 is located between the two support bodies 205, and the support body 205 that is allowed to move can be close to the support body 205 on the moving seat 203, so that the spindle 100 is clamped by the two support bodies 205, and when the spindle 100 needs to be loosened, the two support bodies 205 can be separated; Specific as Figure 3 and Figure 5 As shown, a plurality of long holes 202 are opened on the end face of the disk body 201, and the moving seat 203 passes through the long holes 202. When the moving seat 203 moves in the long holes 202, the moving seat 203 moves along the radial direction of the end face of the disk body 201. The power unit 400 is located on the inner side of the disk body 201, so that the power unit 400 can drive the roller body 204 to move through the moving seat 203. Of course, in addition to this method, other methods can also be used to achieve the above purpose, which will not be elaborated here.

[0029] Since the roller 204 and the rolling element 206 both act on the flange position of the main shaft 100, Figure 5 As shown, the roller body 204 in the pressing group is located between two support bodies 205 in the corresponding side pressing part.

[0030] Optimized to the above implementation, such as Figure 5 As shown, a plurality of tubes 209 are inserted into a support body 205 fixed on a movable seat 203 in the side pressure portion, and each roller 204 is fixed to the end of the tube 209. The power unit 400 drives the roller 204 to rotate through the tube 209. A pull column 210 is slidably inserted into each tube 209. The pull column 210 passes through the corresponding roller 204 and is fixed on another support body 205. The power unit 400 drives the corresponding support body 205 to move through the pull column 210. Here, a plurality of tubes 209 and a plurality of pull columns 210 are used to control the movable The support body 205 is supported by the support body 205 in a state, so that the rotation of the support body 205 can be limited synchronously, that is, the support body 205 is only allowed to move in a straight line, and other forms of movement are not allowed, which not only achieves the effect of providing power for the movement of the support body 205, but also achieves the effect of limiting the alignment movement mode; the tube body 209 mainly provides a support position for the roller body 204, and the power unit 400 can drive the roller body 204 to rotate through the tube body 209, thereby also realizing power supply for the rotational movement of the roller body 204 in the movement form; It should be pointed out here that the tube body 209 is rotationally connected with at least one of the splint 1 207 and the splint 208 on the corresponding support body 205, and the pull column 210 can be fixedly connected with the splint 1 207 or the splint 208 on the movable support body 205.

[0031] Furthermore, if Figure 4As shown, the power unit 400 includes a moving ring 401 slidingly located on the inner side of the disk body 201 and an oil cylinder 402 located on the inner side of the disk body 201 and providing power for the movement of the moving ring 401. The moving ring 401 is transmission-connected with each moving seat 203. When the moving ring 401 moves, the plurality of moving seats 203 approach or separate from each other. The oil cylinder 402 is used to provide power for the movement of the moving ring 401, thereby synchronously providing power for the movement of the plurality of moving seats 203. This facilitates synchronous control of the plurality of moving seats 203, and the purpose of moving the plurality of moving seats 203 can be achieved by one power source, without the cumbersome operation of setting a power source for each moving seat 203. At the same time, this structural method can improve the synchronization of the movement of the plurality of moving seats 203, thereby improving the positioning accuracy of the axis of the spindle 100. It should be pointed out that the transmission relationship between the moving ring 401 and each moving seat 203 can be any form such as lever transmission, hydraulic transmission, gear / rack transmission, slope transmission, etc. As long as it can achieve the purpose of this case, it is within the protection scope of this case.

[0032] In order to simplify the structure and facilitate processing, the moving ring 401 is coaxial with the disk body 201, and the moving ring 401 moves along its own axial direction. The end surface of the moving ring 401 facing the moving seat 203 is set to a conical surface, and the end surface of the moving seat 203 facing the moving ring 401 is set to a slope surface used in conjunction with the conical surface of the moving ring 401; in this way, when the moving ring 401 moves, the conical surface and the slope surface between the moving ring 401 and the moving seat 203 can be used to push the moving seat 203 close to or away from the axis of the disk body 201, thereby achieving the purpose of driving a number of moving seats 203 to move; because the moving ring 401 needs to drive the moving seat 203 to move in two directions, the moving ring 401 and the moving seat 203 need to remain connected. Here, a number of sliding grooves can be opened in the direction of the generatrix of the conical surface of the moving ring 401, and sliding edges can be set on the slope of the moving seat 203, so that the sliding grooves and the sliding edges are slidably connected to each other. Of course, other methods can also be used to connect the moving ring 401 and the moving seat 203, as long as the purpose of this case can be achieved.

[0033] like Figure 4 and Figure 6As shown, the power unit 400 also includes a pull ring 403 located on the inner side of the moving ring 401 and connected to each pulling column 210. The pull ring 403 is connected to the fixed end of each oil cylinder 402 via a connecting frame 404. The fixed end of the oil cylinder 402 is connected to the disk body 201 via an elastic body 405. The elastic body 405 provides elastic support for the oil cylinder 402. The connecting frame 404 is slidably arranged in the disk body 201. It can be seen from the movement form of the moving ring 401 and the oil cylinder 402 that the sliding direction of the connecting frame 404 is along the axial direction of the disk body 201. The connecting frame 404 can provide support for the oil cylinder 402, the moving ring 401 and the pull ring 403 to ensure the normal operation of the above structure. Of course, the moving ring 401 can also be slidably installed on the inner wall of the disk body 201 to enhance the stability of the structure. When the oil cylinder 402 is extended, it will directly push the moving ring 401 to move, thereby driving a number of moving seats 2 03 and roller body 204 are close to each other and fix the main shaft 100. When roller body 204 completes fixing to main shaft 100, roller body 204 no longer moves. At this time, movable ring 401 stops moving, and oil cylinder 402 continues to extend. Then the fixed end of oil cylinder 402 realizes movement by compressing elastic body 405, that is, the fixed end of oil cylinder 402 moves and drives pull ring 403 to move through connecting frame 404. Pull ring 403 moves in the opposite direction of the movement of oil cylinder 402. Pull ring 403 pulls pull column 210 and corresponding support body 205 to move. In this way, oil cylinder 402 can be used as a power source to provide power for the movement of roller body 204 and support body 205, and there is a time difference in this providing method, so as to realize the purpose of roller body 204 moving first and support body 205 moving later. In order to achieve the above purpose, the present case only needs to use elastic body 405, and its structure is simple and its functionality is strong. It should be noted that there is no limit to the number of the oil cylinder 402 and its supporting structures, which can be set and assembled according to actual conditions, and will not be described in detail here; the elastic body 405 can specifically adopt at least one of the elastic structures such as a spring, a spring sheet, a leaf spring, etc.; The disk body 201 may be equipped with an oil supply and discharge passage 406 to provide power for the telescopic movement of the oil cylinder 402. The specific structure of the oil supply and discharge passage 406 may be a conventional structure.

[0034] like Figure 4 and Figure 6As shown, the power unit 400 also includes a transmission ring 407 and a first motor 408 arranged in the disc body 201. The output end of the first motor 408 is provided with a first transmission wheel 409 for meshing with the transmission ring 407. Each tube body 209 is provided with a second transmission wheel 410 for meshing with the transmission ring 407. The transmission ring 407 rotates in the disc body 201. The first motor 408 and the first transmission wheel 409 can drive the transmission ring 407 to rotate, and then the transmission ring 407 can drive the plurality of second transmission wheels 410 to rotate, thereby providing rotational power for each roller body 204, so that the main shaft 100 can rotate.

[0035] In the above embodiment, since the movable seat 203 and the roller body 204 can only move in a specified direction, the position of the gap between two adjacent pressing groups is fixed. However, in actual production, the tool processing position can be moved. Therefore, in order to adapt to production, the position of the gap also needs to be set to be adjustable. Figure 1 As shown, a frame 500 for supporting the disk body 201 is arranged on the outside of the disk body 201, and the disk body 201 is relatively fixed on the machine tool through the frame 500, and the disk body 201 rotates on the frame 500, and a second motor 501 and a third transmission wheel 502 are arranged on the frame 500 to provide power for the rotation of the disk body 201; specifically, the second motor 501 can be installed on the frame 500, and the third transmission wheel 502 is installed on the output end of the second motor 501, and the third transmission wheel 502 is connected to the outer wall of the second motor 501 by transmission. Of course, this transmission method can adopt transmission methods such as belts and gears. In this way, when the second motor 501 and the third transmission wheel 502 drive the disk body 201 to rotate, the gap position between two adjacent pressing groups can be adjusted.

[0036] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A machine tool structure with an avoidance fixed spindle, characterized in that: Installed on the machine tool to fix the spindle, including: A fixing unit clamps one end of the spindle, comprising a disc and a plurality of pressing groups, the plurality of pressing groups are distributed on the end surface of the disc around the axis of the disc, the plurality of pressing groups can be close to or separated from each other, the pressing group comprises a plurality of rollers, the rollers press and fix the spindle, and the rollers rotate and drive the spindle to rotate at least in a partial range where the rollers move; A lifting unit, for lifting the other end of the main shaft; A power unit, providing power for the movement of the roller; Wherein, the disc body and the lifting unit are relatively fixed on the machine tool, and the power unit is arranged on the disc body.

2. The machine tool structure with an avoidance fixed spindle according to claim 1, characterized in that: The number of the pressing groups is at least three, and the coverage area in the circumferential direction of the disk body is larger than a semicircle. The number of the roller bodies in the pressing group is at least two, and the axes of the roller bodies are parallel to each other.

3. The machine tool structure with an avoidance fixed spindle according to claim 1, characterized in that: The pressing group moves along the radial direction of the end surface of the disk body.

4. The machine tool structure with an avoidance fixed spindle according to claim 3, characterized in that: The pressing group further includes a side pressing portion, which positions the main shaft in the direction of its own axis; The side pressure portion includes two support bodies, and a plurality of rolling bodies in contact with the main shaft are arranged on the support bodies.

5. The machine tool structure with an avoidance fixed spindle according to claim 4, characterized in that: The rolling body is in the shape of a frustum, and when the roller body is in the working position, the tip of the cone where the rolling body is located coincides with the axis of the disc body.

6. The machine tool structure with an avoidance fixed spindle according to claim 4, characterized in that: The pressing group also includes a moving seat; One of the support bodies in the side pressure portion is fixed on the corresponding moving seat, and the other support body moves along the vertical connection direction between the two support bodies and limits the position of the main shaft in the direction of its own axis.

7. The machine tool structure with an avoidance fixed spindle according to claim 6, characterized in that: A plurality of tubes are inserted into one of the support bodies fixed on the movable seat in the side pressure portion, and each roller body is fixed to the end of the tube body. The power unit drives the roller body to rotate through the tube body. A pulling column is slidably inserted into each tube body, and the pulling column passes through the corresponding roller body and is fixed to another support body. The power unit drives the corresponding support body to move through the pulling column.

8. The machine tool structure with an avoidance fixed spindle according to claim 7, characterized in that: The disk body is hollow; The power unit includes a moving ring slidably located inside the disk body and an oil cylinder located inside the disk body and providing power for the movement of the moving ring. The moving ring is transmission-connected to each of the moving seats. When the moving ring moves, several moving seats move closer to or away from each other. The moving ring is coaxial with the disk body and moves along its own axis. The end surface of the moving ring facing the moving seat is set as a conical surface, and the end surface of the moving seat facing the moving ring is set as a slope surface used in conjunction with the conical surface of the moving ring.

9. The machine tool structure with an avoidance fixed spindle according to claim 8, characterized in that: The power unit also includes a pull ring located on the inner side of the movable ring and connected to each of the pull columns. The pull ring is connected to the fixed end of each of the oil cylinders via a connecting frame. The fixed end of the oil cylinder is connected to the disk body via an elastomer. The elastomer provides elastic supporting force for the oil cylinder. The connecting frame is slidably arranged in the disk body.

10. The machine tool structure with an avoidance fixed spindle according to claim 1, characterized in that: A frame supporting the disc is arranged outside the disc, the disc is relatively fixed on the machine tool through the frame, the disc rotates on the frame, and a second motor and a third transmission wheel providing power for the rotation of the disc are arranged on the frame.

Images