Double-tool-changing mechanism and slow-feeding grinding machine

Abstract

The utility model provides a double-tool-changing mechanism and a slow-feeding grinding machine, the double-tool-changing mechanism comprises a tool changing arm and at least one tool changing unit set arranged on the tool changing arm, each tool changing unit set comprises two tool changing units, one tool changing unit in each tool changing unit set is used for changing a first tool, and the other tool changing unit in each tool changing unit set is used for changing a second tool. And the other tool changing unit is used for changing the second tool. The tool changing unit comprises a driving and guiding device, two tool changing claws and a guiding key, the middles of the two tool changing claws are rotationally connected with the tool changing arm, and the driving and guiding device is used for driving the two tool changing claws to rotate so that the two tool changing claws can be oppositely opened in the guiding direction to loosen a tool. Or the two tool changing claws are oppositely folded in the guide direction to clamp the tool; the guide key is arranged on the tool changing arm between the two tool changing claws and used for being inserted into a guide groove of a tool when the tool is clamped so that the tool can be clamped at the correct position. According to the double-tool-changing mechanism and the slow-feeding grinding machine, the changing efficiency and the machining precision can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of machining equipment technology, and in particular to a double tool changing mechanism and a creeping grinding machine. Background Technology

[0002] Currently, many creep-feed grinding machines are equipped with rollers for dressing grinding wheels. However, the rollers and grinding wheels on creep-feed grinding machines need to be replaced frequently. Existing technologies mostly use robotic arms or other tool-changing mechanisms to replace grinding wheels, while rollers are usually replaced manually. This process requires disassembling the entire roller shaft along with the roller before replacing it. This is labor-intensive and inefficient. After reinstalling the roller, the machining parameters also need to be readjusted. The whole process is very cumbersome, and it is difficult to maintain consistent machining accuracy. Summary of the Invention

[0003] Based on this, this application provides a dual tool changing mechanism and a creeping grinding machine to improve the problems of low tool changing efficiency, inconsistent machining accuracy and high manual labor intensity caused by the inability to change the two tools synchronously in the prior art.

[0004] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0005] On one hand, this application provides a dual tool changing mechanism, including a tool changing arm and at least one tool changing unit group disposed on the tool changing arm. Each tool changing unit group includes two tool changing units. One of the tool changing units in each tool changing unit group is used to change a first tool, and the other tool changing unit is used to change a second tool.

[0006] The tool changing unit includes a drive and guide device, two tool changing claws, and a guide key. The middle portions of the two tool changing claws are rotatably connected to the tool changing arm. The drive and guide device is used to drive the two tool changing claws to rotate, so that the two tool changing claws open relative to each other in the guide direction to release the tool, or so that the two tool changing claws close relative to each other in the guide direction to clamp the tool. The guide key is located on the tool changing arm between the two tool changing claws and is used to insert into the guide groove of the tool when clamping the tool so as to clamp the tool in the correct position.

[0007] In one embodiment, the tool changing arm is an "I"-shaped plate structure, including a first mounting plate, a connecting plate, and a second mounting plate arranged sequentially along the width direction. The first mounting plate is equipped with a tool changing unit at each end near the length direction, and the second mounting plate is also equipped with a tool changing unit at each end near the length direction. The connecting plate is provided with a connecting structure for connecting to the tool changing shaft of the creep-feed grinding machine. The tool changing units mounted on the same side of the first mounting plate and the second mounting plate respectively constitute a tool changing unit group.

[0008] In one embodiment, the driving and guiding device includes a telescopic device, a guide block, a mounting block, a clamping and resetting elastic element, and a releasing and retaining elastic element; the telescopic device and the guide block are drivenly connected, the telescopic device is located in the middle of the tool changing arm, and the central axis of the telescopic device coincides with the central axis of the corresponding tool changing claw; the mounting block is located on the tool changing arm between the two tool changing claws and is positioned near the end of the tool changing arm in the length direction; the two ends of the clamping and resetting elastic element abut against the guide block and the mounting block, respectively; the two ends of the releasing and retaining elastic element abut against the two tool changing claws, respectively, and are located outside the line connecting the rotation points of the two tool changing claws and the tool changing arm; the guide block is located on the tool changing arm outside the mounting block.

[0009] In one embodiment, the dual tool changer mechanism further includes a floating joint, and the drive end of the telescopic device is driven connected to the guide block through the floating joint.

[0010] In one embodiment, the tool changing claw includes a tail, a connecting portion, and a clamping claw arranged sequentially; the two tool changing claws in each tool changing unit are mirror images of each other, and the clamping claw protrudes from the end of the tool changing arm; a guide block is located between the two tails, the guide block is a dovetail-shaped guide block, and the guide block forms two guide surfaces on the side walls on both sides of the central axis of the tool changing unit, the distance between the two guide surfaces gradually decreases from the tool changing claw towards the telescopic device; the two tails are provided with inclined portions that cooperate with the guide surfaces; the connecting portion is rotatably connected to the tool changing arm through a bearing; the radial dimension of the space enclosed by the two clamping claws when they are closed corresponds to the radial dimension of the tool mounting portion; the two ends of the release retaining elastic member abut against the side walls of the two connecting portions respectively.

[0011] In one embodiment, the dual tool changing mechanism further includes a tool holder mounting shaft, the tool changing claw and the tool holder mounting shaft are fixedly connected, and a bearing assembly is sleeved on the tool holder mounting shaft. The bearing assembly includes a first thrust needle roller bearing, a common needle roller bearing and a second thrust needle roller bearing arranged sequentially along the axial direction of the tool holder mounting shaft.

[0012] In one embodiment, the dual tool changing mechanism further includes a protective cover assembly, which covers the tool changing arm, and a receiving space for the tool changing unit is formed between the tool changing arm and the protective cover assembly. The protective cover assembly is used to protect the tool changing unit.

[0013] On the other hand, embodiments of this application provide a creep-feed grinding machine, including the dual tool changing mechanism as described above, and further including a machine base, a tool changing shaft, a first tool shaft, and a second tool shaft disposed on the machine base. The height of the tool changing shaft is adapted to the heights of the first tool shaft and the second tool shaft. The dual tool changing mechanism is connected to the tool changing shaft via a connecting structure. One of the tool changing units in the tool changing unit group is used to install a first tool onto the first tool shaft or remove the first tool from the first tool shaft. The other tool changing unit in the tool changing unit group is used to install a second tool onto the second tool shaft or remove the second tool from the second tool shaft.

[0014] In one embodiment, the creep grinding machine further includes a drive mechanism disposed on the machine base. The drive mechanism includes a first drive mechanism, a second drive mechanism, and a third drive mechanism. The first drive mechanism is used to drive the double tool changer to move horizontally toward or away from the first tool axis and the second tool axis. The second drive mechanism is used to drive the double tool changer to move back and forth along the axial direction of the first tool axis and the second tool axis. The third drive mechanism is used to drive the tool changer arm to rotate about the tool changer axis.

[0015] In one embodiment, the creep grinding machine further includes a tool loading and unloading mechanism, which is used to install tools from the tool magazine into the tool changing unit, or to place tools from the tool changing unit into the tool magazine.

[0016] This application has at least the following beneficial effects: The dual tool changing mechanism provided by this application includes at least one tool changing unit group, each of which includes two tool changing units. These two units can simultaneously change two tools synchronously, effectively improving tool changing efficiency, reducing manual labor intensity, and allowing for immediate use without adjusting machining parameters after the two tools are changed synchronously. This effectively improves the consistency of machining accuracy between batches of products and simplifies the tool changing process. The tool changing unit provided by this application has a simple overall structure, and its drive and guide devices have both driving and guiding functions. When driving the tool changing claw, it can move it along the direction specified by the guide, and the guide key can securely clamp the tool, preventing tool deflection. Simultaneously, it ensures the tool is clamped in the correct orientation, facilitating tool assembly and disassembly. The creep-feed grinding machine provided by this application includes the aforementioned dual tool changing mechanism and therefore also possesses the above-mentioned beneficial effects. Attached Figure Description

[0017] Figure 1 This is a front view schematic diagram of the dual tool changing mechanism in this application embodiment, where one end of the mechanism clamps the first tool and the second tool respectively.

[0018] Figure 2 for Figure 1 A schematic diagram of the internal structure of the double tool changer mechanism.

[0019] Figure 3 This is a schematic diagram of the tool mounting section according to an embodiment of this application.

[0020] Figure 4 This is a front view structural diagram of the tool changer arm according to an embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the tool changing unit from one perspective, according to an embodiment of this application.

[0022] Figure 6 for Figure 5 A structural schematic diagram of the tool changing unit from another perspective.

[0023] Figure 7 This is a schematic diagram of the structure of the guide block in an embodiment of this application.

[0024] Figure 8 This is a schematic diagram of the assembly structure of the tool changing claw and the tool claw mounting shaft according to an embodiment of this application.

[0025] Figure 9 This is a schematic diagram of the structure of the creep grinder according to an embodiment of this application.

[0026] Figure 10 for Figure 9 A schematic diagram of the structure of a creeping grinder from another perspective.

[0027] The meanings of the labels in the attached diagram are as follows:

[0028] 1. Dual tool changing mechanism; 11. Tool changing unit group; 110. Tool changing unit; 111. Protective cover assembly; 112. Drive and guide device; 1121. Telescopic device; 1122. Floating joint; 1123. Guide block; 11231. Guide surface; 1124. Clamping and resetting elastic element; 1125. Mounting block; 1126. Releasing and retaining elastic element; 114. Tool changing claw; 1141. Tail end; 1142. Connecting part; 1143. Claw; 11431. Boss; 1144. Claw mounting shaft; 1145. Bearing assembly; 113. Guide key; 12. Tool changing arm; 121. First mounting plate; 122. Connecting plate; 123. Second mounting plate; 124. Connecting structure;

[0029] 2. First cutting tool; 3. Second cutting tool; 4. Mounting part; 41. Guide groove; 42. Slot; 5. Machine base; 51. Drive mechanism; 52. Cutting tool loading and unloading mechanism; 53. First cutting tool shaft; 54. Second cutting tool shaft; 55. Tool magazine. Detailed Implementation

[0030] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the ways in which this application may be implemented. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] In the description of this application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] Please see Figure 1 and Figure 2 The dual tool changing mechanism 1 of this application embodiment includes a tool changing arm 12 and at least one tool changing unit group 11 disposed on the tool changing arm 12. Each tool changing unit group 11 includes two tool changing units 110. One of the tool changing units 110 in each tool changing unit group 11 is used to change the first tool 2, and the other tool changing unit 110 is used to change the second tool 3.

[0035] like Figure 2 and Figure 3 As shown, the tool changing unit 110 includes a drive and guide device 112, two tool changing claws 114, and a guide key 113. The middle portions of the two tool changing claws 114 are rotatably connected to the tool changing arm 12. The drive and guide device 112 is used to drive the two tool changing claws 114 to rotate, so that the two tool changing claws 114 open relative to each other in the guide direction to release the tool, or to close relative to each other in the guide direction to clamp the tool (first tool 2 or second tool 3). The guide key 113 is provided on the tool changing arm 12 between the two tool changing claws 114, and is used to insert into the guide groove 41 of the tool when clamping the tool, so as to clamp the tool in the correct position.

[0036] Specifically, such as Figure 2 and Figure 4As shown, in this embodiment, the tool changing arm 12 is an "I"-shaped plate structure, including a first mounting plate 121, a connecting plate 122, and a second mounting plate 123 arranged sequentially along the width direction. A tool changing unit 110 is mounted on each end of the first mounting plate 121 near its length direction, and a tool changing unit 110 is also mounted on each end of the second mounting plate 123 near its length direction. A connecting structure 124 is provided on the connecting plate 122 for connecting to the tool changing shaft of the creep-feed grinding machine. The tool changing units 110 mounted on the same side of the first mounting plate 121 and the second mounting plate 123 respectively constitute a tool changing unit group 11. The tool changing arm 12 can be a one-piece molded structure or formed by fixing and splicing three plates. A one-piece molded structure is preferred, as it improves the reliability of the tool changing mechanism, increases machining accuracy, and reduces assembly difficulty. The first mounting plate 121 and the second mounting plate 123 are arranged in parallel. Two tool changing units 110 located at the same end along the length direction constitute a tool changing unit group 11. During the installation and removal of tools, the two tool changing units 110 are arranged side by side along the vertical direction. In this embodiment, a tool changing unit group 11 is installed at each end of the tool changing arm 12 along its length direction, for a total of two tool changing unit groups 11. The two tool changing unit groups 11, in conjunction with the drive mechanism 51 and the tool picking and placing mechanism 52, can install the tools in the tool magazine 55 to the tool changing unit group 11 at one end while simultaneously removing the tools from the tool shaft on the feed grinder. While installing tools on the tool shaft, tools at the other end can also be removed and placed into the tool magazine 55, effectively improving tool changing efficiency.

[0037] like Figure 5 and Figure 6As shown, the drive and guide device 112 includes a telescopic device 1121, a guide block 1123, a mounting block 1125, a clamping and resetting elastic element 1124, and a releasing and retaining elastic element 1126. The telescopic device 1121 and the guide block 1123 are drivenly connected. The telescopic device 1121 is located in the middle of the tool changing arm 12, and the central axis of the telescopic device 1121 coincides with the central axis of the corresponding tool changing claw 114. That is, the telescopic device 1121, the guide block 1123, the mounting block 1125, and the two tool changing claws 114 are symmetrically arranged along the same central axis. The telescopic device 1121 can be, for example, a cylinder, a hydraulic cylinder, or other similar device. The mounting block 1125 is located on the tool changing arm 12 between the two tool changing claws 114 and is positioned near the end of the tool changing arm 12 along its length. The two ends of the clamping and resetting elastic element 1124 abut against the guide block 1123 and the mounting block 1125, respectively. The two ends of the release retaining elastic element 1126 abut against the two tool changing claws 114 respectively, and are located outside the line connecting the rotation points of the two tool changing claws 114 and the tool changing arm 12; the guide block 1123 is provided on the tool changing arm 12 outside the mounting block 1125. The clamping reset elastic element 1124 and the release retaining elastic element 1126 can be, for example, springs or other structural components with elastic reset function. The guide block 1123 and the mounting block 1125 have mounting holes on their opposite side walls, and the two ends of the clamping reset elastic element 1124 are located in the mounting holes and abut against the guide block 1123 and the mounting block 1125 respectively. The mounting position of the mounting block 1125 is approximately located near the line connecting the rotation hinge points of the two tool changing claws and the tool changing arm 12. The two opposite side walls of the two tool changing claws 114 also have mounting holes, and the two ends of the release retaining elastic element 1126 are located in the corresponding mounting holes and abut against the two tool changing claws 114 respectively. The release retaining elastic element 1126 provides the driving force for the two tool-changing claws 114 to open. When the telescopic device 1121 pushes the guide block 1123 to move outward towards the tool-changing arm 12, the elastic force of the release retaining elastic element 1126 acts on the two tool-changing claws 114, causing the tool-changing claws 114 to open. When the two tool-changing claws 114 close, the thrust of the telescopic device 1121 disappears, and the clamping reset elastic element 1124 pushes the guide block 1123 to move inward towards the tool-changing arm 12, causing the two tool-changing claws 114 to close. At this time, the telescopic device 1121 can also be reversed, and the driving end of the telescopic device 1121 pulls the guide block 1123 to move inward. This increases the stability and reliability of the tool-changing claws 114 clamping, meeting the clamping requirements of heavy-duty tools.

[0038] In some embodiments, the dual tool changer 1 further includes a floating joint 1122, and the drive end of the telescopic device 1121 is drivenly connected to the guide block 1123 through the floating joint 1122. The floating joint 1122 can compensate for some movement position deviations and avoid equipment damage.

[0039] like Figure 7 and Figure 8 As shown, each tool changer 114 includes a tail portion 1141, a connecting portion 1142, and a gripper 1143 arranged sequentially, and each tool changer 114 is an integral structure. The two tool changer 114s in each tool changer unit 110 are mirror images of each other, and the gripper 1143 protrudes from the end of the tool changer arm 12. A guide block 1123 is located between the two tail portions 1141. The guide block 1123 is a dovetail-shaped guide block, and the guide block 1123 forms two guide surfaces 11231 on the side walls on both sides of the central axis of the tool changer unit 110. The distance between the two guide surfaces 11231 gradually decreases from the tool changer 114 towards the telescopic device 1121. The two tail portions 1141 are provided with inclined surfaces that mate with the guide surfaces 11231. When the telescopic device 1121 pushes the guide block 1123 outward (the end closer to the length of the tool changing arm 12 is the outward side, and the direction closer to the middle of the tool changing arm 12 is the inward side), the two tool changing claws 114 can move along the inclined surface of the guide surface 11231, thereby causing the two tool changing claws 114 to open along a predetermined route. During the opening process of the two tool changing claws 114, the inclined surface and the guide surface 11231 are always in contact. The two guide surfaces 11231 are symmetrically arranged along the central axis of the tool changing unit 110. The connecting part 1142 is rotatably connected to the tool changing arm 12 via a bearing. The radial dimension of the space enclosed by the two grippers 1143 when they are closed corresponds to the radial dimension of the tool mounting part 4. The surface of the opposite side of the two grippers 1143 is an arc-shaped surface. When the two grippers 1143 are closed, the two arc-shaped surfaces form a tool clamping space. To enhance the reliability of the gripper 1143 in holding the tool, a ring of bosses 11431 can be radially formed on the arc-shaped surface. The upper and lower surfaces of the bosses 11431 are inclined. The tool mounting portion 4 has a ring of grooves 42 radially formed. When the gripper 1143 holds the tool, the bosses 11431 are inserted into the grooves 42, thereby better holding the tool. The inclined surfaces of the bosses 11431 are consistent with the grooves 42, ensuring the reliability and accuracy of tool holding and guaranteeing the repeatability of tool holding. The two ends of the release retaining elastic member 1126 abut against the side walls of the two connecting portions 1142, and the release retaining elastic member 1126 is located inside the guide key 113.

[0040] In some embodiments, such as Figure 6 and Figure 8As shown, the dual tool changing mechanism 1 also includes a tool holder mounting shaft 1144. The tool changing claw 114 and the tool holder mounting shaft 1144 are fixedly connected. A bearing assembly 1145 is sleeved on the tool holder mounting shaft 1144. The bearing assembly 1145 includes a first thrust needle roller bearing, a common needle roller bearing, and a second thrust needle roller bearing arranged sequentially along the axial direction of the tool holder mounting shaft 1144. The tool holder mounting shaft 1144 is mounted on the surface of the tool changing claw 114 near the tool changing arm 12 and is located on the connecting part 1142 of the tool changing claw 114. The combined use of the thrust needle roller bearing and the common needle roller bearing can provide good support for the tool changing claw 114, ensuring that the tool changing claw 114 has no axial or radial movement, thereby improving the tool installation accuracy.

[0041] like Figure 1 As shown, the dual tool changer mechanism 1 in this embodiment also includes a protective cover assembly 111. The protective cover assembly 111 covers the tool changer arm 12, and a receiving space for the tool changer unit 110 is formed between the tool changer arm 12 and the protective cover assembly 111. The protective cover assembly 111 is used to protect the tool changer unit 110. The protective cover assembly 111 includes multiple housing and plate structures. The protective cover assembly 111 completely covers the portions of each component in the dual tool changer mechanism 1 located on the tool changer arm 12. While protecting each component, it also makes the appearance neater, easier to clean, and improves the safety of the equipment during operation.

[0042] like Figure 9 and Figure 10 As shown in the illustration, this application embodiment also provides a creep-feed grinding machine, including the aforementioned dual tool changer 1, and further including a machine base 5, a tool changer shaft mounted on the machine base 5, a first tool shaft 53, and a second tool shaft 54. The height of the tool changer shaft is adapted to the height of the first tool shaft 53 and the second tool shaft 54. The dual tool changer 1 is connected to the tool changer shaft via a connecting structure 124. One tool changer unit 110 in the tool changer unit group 11 is used to install the first tool 2 onto the first tool shaft 53 or remove the first tool 2 from the first tool shaft 53; the other tool changer unit 110 in the tool changer unit group 11 is used to install the second tool 3 onto the second tool shaft 54 ​​or remove the second tool 3 from the second tool shaft 54. The first tool 2 may be, for example, a grinding wheel, and the second tool 3 may be, for example, a roller. The height of the tool changing shaft is adapted to the height of the two tool shafts. That is, when the tool changing operation is performed by the double tool changing mechanism 1, the height of the double tool changing mechanism 1 does not need to be adjusted. The positions of its two tool changing units 110 are exactly consistent with the positions of the two tool shafts, making the tool changing operation more convenient and improving the tool changing accuracy. After the tool is replaced, there is no need to readjust the tool's machining parameters.

[0043] The creep-feed grinding machine in this embodiment also includes a drive mechanism 51 mounted on the machine base 5. The drive mechanism 51 includes a first drive mechanism 51, a second drive mechanism 51, and a third drive mechanism 51. The first drive mechanism 51 drives the double tool changer 1 to move horizontally toward or away from the first tool axis 53 and the second tool axis 54. The second drive mechanism 51 drives the double tool changer 1 to move axially back and forth along the first tool axis 53 and the second tool axis 54. The third drive mechanism 51 drives the tool changer arm 12 to rotate about the tool changer axis. The first and second drive mechanisms 51 can be linear motion mechanisms such as gear racks, lead screws, or cylinders, while the third drive mechanism 51 can be a hollow rotary table, a gear reducer, or the like.

[0044] The creep-feed grinding machine in this embodiment also includes a tool magazine 55 and a tool loading and unloading mechanism 52 disposed within the tool magazine 55. The tool loading and unloading mechanism 52 is used to install tools from the tool magazine 55 into the tool changing unit 110, or to place tools from the tool changing unit 110 into the tool magazine 55. The tool loading and unloading mechanism 52 can be controlled by a controller or other control components. The tool loading and unloading mechanism 52 is also provided with a drive device, which can drive the tool loading and unloading mechanism 52 to move horizontally, vertically, and forward and backward (i.e., in the three directions of the three-dimensional coordinate axis) so as to load and unload tools at different positions.

[0045] The tool changing process of the creep grinder in this embodiment is as follows: When it is necessary to replace the first tool 2 and the second tool 3, the first drive mechanism 51 drives the tool changing arm 12 to move horizontally towards the two tool shafts, and the second drive mechanism 51 drives the tool changing arm 12 to move back and forth, so that the position of the tool changing claw 114 corresponds to the position of the tool mounting part 4. Then, the two tool shafts are rotated so that the guide keys 113 of the two tool changing units 110 in the tool changing unit group 11 on the side close to the two tool shafts are respectively inserted into the guide groove 41 of the tool, and the two tool changing claws 114 clamp the two tools to be disassembled respectively. At the same time, the tool picking and placing mechanism 52 removes the tool to be installed from the tool magazine 55 and moves it to the two tool changing claws 114 on the side away from the two tool shafts, and the tool changing claws 114 clamp the two tools to be installed. At this time, the first drive mechanism 51 drives the tool changing arm 12 to move horizontally away from the two tool shafts, and at the same time, the third drive mechanism 51 drives the tool changing arm 12 to rotate 180 degrees. The first drive mechanism 51 drives the tool changing arm 12 to move closer to the two tool shafts. After reaching the corresponding position, the tool changing claw 114 on the side closer to the tool shaft installs the tool mounting part 4 onto the tool shaft and then releases the tool, completing the tool installation. At the same time, when the tool pick-and-place mechanism 52 clamps the tool to be disassembled, the corresponding tool changing claw 114 releases the tool, and the tool pick-and-place mechanism 52 puts the disassembled tool back into the tool magazine 55, completing the tool storage.

[0046] The dual tool changing mechanism and creeping grinder provided in this application have a simple overall structure and can simultaneously replace the roller and grinding wheel, improving replacement efficiency and installation accuracy, and reducing the labor intensity of manual operation.

[0047] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dual-tool changing mechanism, characterized in that, It includes a tool changing arm and at least one tool changing unit group disposed on the tool changing arm. Each tool changing unit group includes two tool changing units. One of the tool changing units in each tool changing unit group is used to replace a first tool, and the other tool changing unit is used to replace a second tool. The tool changing unit includes a drive and guide device, two tool changing claws, and a guide key. The middle portions of the two tool changing claws are rotatably connected to the tool changing arm. The drive and guide device is used to drive the two tool changing claws to rotate, so that the two tool changing claws open relative to each other in the guide direction to release the tool, or so that the two tool changing claws close relative to each other in the guide direction to clamp the tool. The guide key is located on the tool changing arm between the two tool changing claws and is used to insert into the guide groove of the tool when clamping the tool so as to clamp the tool in the correct position.

2. The dual tool changing mechanism as described in claim 1, characterized in that, The tool changing arm has an "I" shaped plate structure, including a first mounting plate, a connecting plate, and a second mounting plate arranged sequentially along the width direction. The first mounting plate is equipped with a tool changing unit at each end near the length direction, and the second mounting plate is also equipped with a tool changing unit at each end near the length direction. The connecting plate is provided with a connecting structure for connecting to the tool changing shaft of the creep-feed grinding machine. The tool changing units mounted on the same side of the first mounting plate and the second mounting plate respectively constitute a tool changing unit group.

3. The dual tool changing mechanism as described in claim 2, characterized in that, The driving and guiding device includes a telescopic device, a guide block, a mounting block, a clamping and resetting elastic element, and a releasing and retaining elastic element. The telescopic device and the guide block are drivenly connected. The telescopic device is located in the middle of the tool changing arm, and the central axis of the telescopic device coincides with the central axis of the corresponding tool changing claw. The mounting block is located on the tool changing arm between the two tool changing claws and is positioned near the end of the tool changing arm along its length. The two ends of the clamping and resetting elastic element abut against the guide block and the mounting block, respectively. The two ends of the releasing and retaining elastic element abut against the two tool changing claws, respectively, and are located outside the line connecting the rotation points of the two tool changing claws and the tool changing arm. The guide block is located on the tool changing arm outside the mounting block.

4. The dual tool changer mechanism as described in claim 3, characterized in that, It also includes a floating joint, and the drive end of the telescopic device is driven to be connected to the guide block through the floating joint.

5. The dual tool changing mechanism as described in claim 3, characterized in that, The tool changing claw includes a tail, a connecting part, and a clamping claw arranged sequentially; the two tool changing claws in each tool changing unit are mirror images of each other, and the clamping claw protrudes from the end of the tool changing arm; the guide block is located between the two tails, and the guide block is a dovetail-shaped guide block. The guide block forms two guide surfaces on the side walls on both sides of the central axis of the tool changing unit, and the distance between the two guide surfaces gradually decreases from the tool changing claw towards the telescopic device; the two tails are provided with inclined surfaces that cooperate with the guide surfaces; the connecting part is rotatably connected to the tool changing arm through a bearing; the radial dimension of the space enclosed by the two clamping claws when they are closed corresponds to the radial dimension of the tool mounting part; the two ends of the release retaining elastic member abut against the side walls of the two connecting parts respectively.

6. The dual tool changing mechanism as described in claim 5, characterized in that, It also includes a cutter claw mounting shaft, the cutter claw and the cutter claw mounting shaft are fixedly connected, and a bearing assembly is sleeved on the cutter claw mounting shaft. The bearing assembly includes a first thrust needle roller bearing, a common needle roller bearing and a second thrust needle roller bearing arranged sequentially along the axial direction of the cutter claw mounting shaft.

7. The dual tool changing mechanism as described in claim 1, characterized in that, It also includes a protective cover assembly, which covers the tool changing arm, and the tool changing arm and the protective cover assembly form a receiving space for the tool changing unit. The protective cover assembly is used to protect the tool changing unit.

8. A creeping grinding machine, characterized in that, The dual tool changing mechanism, as described in any one of claims 1 to 7, further includes a machine base, a tool changing shaft, a first tool shaft, and a second tool shaft mounted on the machine base. The height of the tool changing shaft is adapted to the heights of the first tool shaft and the second tool shaft. The dual tool changing mechanism is connected to the tool changing shaft via a connecting structure. One of the tool changing units in the tool changing unit group is used to install a first tool onto the first tool shaft or remove the first tool from the first tool shaft. The other tool changing unit in the tool changing unit group is used to install a second tool onto the second tool shaft or remove the second tool from the second tool shaft.

9. The creep-feed grinding machine as described in claim 8, characterized in that, It also includes a drive mechanism mounted on the machine base. The drive mechanism includes a first drive mechanism, a second drive mechanism, and a third drive mechanism. The first drive mechanism is used to drive the double tool changer to move horizontally toward or away from the first tool axis and the second tool axis. The second drive mechanism is used to drive the double tool changer to move back and forth along the axial direction of the first tool axis and the second tool axis. The third drive mechanism is used to drive the tool changer arm to rotate about the tool changer axis.

10. The creep-feed grinding machine as described in claim 8, characterized in that, It also includes a tool picking and placing mechanism, which is used to install tools from the tool magazine into the tool changing unit, or to place tools from the tool changing unit into the tool magazine.

Images