Self-locking heavy-load knife pouch

Abstract

The invention provides a self-locking heavy-load cutter sleeve, and belongs to the field of numerical control machine tool machining. The expansion cap is slidably connected with the shell, an inclined part and spring plungers are arranged at one end of the expansion cap, the multiple spring plungers and centering blocks are arranged on the side wall of the shell in a circumferential array mode, the head of each spring plunger penetrates through the shell to abut against the corresponding centering block, and each centering block can slide in the radial direction of the shell; each centering block comprises a connecting block and a centering block, wherein the head of each spring plunger is connected with one connecting block; the positioning plate is arranged on one side of the connecting block, and a transition slope surface is arranged on the bottom surface of the positioning plate; during working, each connecting block abuts against the outer surface of the corresponding inclined part. The problem that in the prior art, a cutter sleeve bears heavy loads and is prone to disengagement is solved. The technical effect is that the cutter is ensured to be stably loaded on the cutter sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control machine tool processing, in particular to a self-locking heavy-load tool sleeve. Background Art

[0002] As a key functional component of CNC machine tools, the tool magazine is responsible for storing and exchanging tools. The tool holder, as the core component of the tool magazine for storing tools, must not only achieve reliable storage of tools, but also ensure the accuracy and safety of the tool changing process.

[0003] Traditional tool holders rely on steel balls, springs, and the tapered surface at the end of the tool shank to clamp the tool. This design principle is simple and low-cost, and it played an important role in early machine tool processing, especially in light-load tool processing scenarios. However, faced with the increasing demand for processing increasingly complex and heavy parts, the disadvantages of traditional tool holders have gradually become apparent. When heavy-loaded tools are involved, the elastic force provided by the spring is difficult to counteract the weight of the tool and the vibration during the tool rotation process, which can cause the tool to accidentally detach from the tool holder, which may not only cause damage to the processing tool and processed parts, but may even endanger the safety of the operator. Summary of the Invention

[0004] The present invention provides a self-locking heavy-load tool housing, which is used to solve the defect in the prior art that the tool housing carrying a heavy-loaded tool is easily disengaged, and realizes a self-locking heavy-load tool housing structure that prevents the heavy-loaded tool from accidentally disengaging from the tool housing.

[0005] The present invention provides a self-locking heavy-duty tool holder, comprising: case; An expansion cap is slidably connected to the housing, and one end of the expansion cap is provided with an inclined portion; Spring plungers, a plurality of spring plungers are provided on the side wall of the housing in a circumferential array; Centering block: the head of each spring plunger passes through the housing and abuts against a centering block, and each centering block is slidable along the radial direction of the housing; Each centering block includes: Connecting block, the head of each spring plunger is connected to a connecting block; A positioning plate is provided on one side of the connecting block, and a transition slope surface is provided on the bottom surface of the positioning plate; During operation, each connecting block abuts against the outer surface of the inclined portion.

[0006] In addition, the self-locking heavy-duty tool holder according to the present invention may also have the following additional technical features: In some embodiments of the present invention, the expansion cap includes: a cap body, a first end of which is connected to the inclined portion, and a second end of which is slidably connected to the housing; a rear cover, disposed at the second end of the cap body; The stopper is arranged in the middle of the cap body and is used to limit the sliding stroke of the cap body.

[0007] In some embodiments of the present invention, in each centering block, the surface of the positioning plate facing away from the connecting block is in the shape of an arc.

[0008] In some embodiments of the present invention, the housing comprises: The rear fixing sleeve has a plurality of plunger through holes on its side wall, and each spring plunger is inserted into a plunger through hole; The half shell, the rear fixing sleeve is connected to the first end of the half shell, and the rear fixing sleeve is mounted on the half shell for placing the handle of the tool.

[0009] In some embodiments of the present invention, further comprising: A plurality of slide grooves are provided in the rear fixed sleeve, the plurality of slide grooves are connected to the plurality of plunger through holes in a one-to-one correspondence, the plurality of slide grooves are all connected to the accommodating cavity in the rear fixed sleeve, and the plurality of centering blocks are slidably inserted in the plurality of slide grooves in a one-to-one correspondence; Stopper: a stopper is provided on the inner side wall of each chute; Each centering block also includes: Limiting bosses: Both sides of the connecting block are provided with limiting bosses. When working, the stopper and the limiting bosses abut against each other in a one-to-one correspondence.

[0010] In some embodiments of the present invention, the housing further comprises: A positioning block is provided at the second end of the half shell, and the positioning block is used to limit the tool circumferentially.

[0011] In some embodiments of the present invention, further comprising: A plunger mounting groove is provided on the side of each connecting block facing away from the positioning plate; The head of the spring plunger is inserted into the plunger installation groove and abuts against the bottom surface of the plunger installation groove.

[0012] In some embodiments of the present invention, further comprising: End cover, which is connected to one end of the shell. An inner stop ring is provided in the shell, a first end of each connecting block is slidably connected to the inner stop ring, and a second end of each connecting block is slidably connected to the end cover.

[0013] In some embodiments of the present invention, the end cap comprises: a cover body abutting against one end of the shell; The end plate is arranged on one side of the cover body and is inserted into the shell. The second end of the connecting block of each centering block is slidably connected to the end plate.

[0014] In some embodiments of the present invention, each centering block further comprises: An inclined surface is provided on the connecting block, and the inclined portion is in surface contact with the inclined surface; The arc transition part is provided on one side of the connecting block close to the positioning plate, and the arc transition part is connected with the inclined surface.

[0015] In summary, the present application includes the following beneficial technical effects: the tool holder has a simple structure and is easy to load and unload, and the spring plunger and other wearing parts are easy to replace, which saves costs; the tool holder has a self-locking function through the coordinated setting of the spring plunger and the centering block, which can meet the clamping of light-load and heavy-load tools at the same time, and solves the problem of heavy-load tools easily falling off; it has good versatility, and due to the setting of multiple spring plungers, the tool holder can be suitable for tools of various specifications, and there is no need to match tool holders of various specifications according to the tool load, which improves the working efficiency of the machine tool; due to the coordinated setting of multiple centering blocks in multiple directions, comprehensive positioning of the tool is achieved, ensuring that the tool is firmly loaded on the tool holder, avoiding the risk of heavy-load tools accidentally detaching from the tool holder, and thus avoiding the occurrence of tool falling accidents, indirectly ensuring the safety of the operator, and the structure of the centering block replaces the previous structure of the steel ball and bushing, solving the failure problem of easy cracking at the matching point between the bushing and the steel ball, and improving the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings: Figure 1 Schematically illustrates an exploded perspective view of a self-locking heavy-duty tool holder according to some embodiments of the present invention.

[0017] Figure 2 Schematically illustrates a front view of a self-locking heavy-duty tool holder according to some embodiments of the present invention.

[0018] Figure 3 Schematically shows an AA cross-sectional view of a self-locking heavy-duty tool holder according to some embodiments of the present invention.

[0019] Figure 4 Schematically shows a BB cross-sectional view of a self-locking heavy-duty tool holder according to some embodiments of the present invention.

[0020] Figure 5 A perspective view schematically illustrates a housing of a self-locking heavy-duty tool holder according to some embodiments of the present invention.

[0021] Figure 6 Schematically shows a front view of a housing of a self-locking heavy-duty tool holder according to some embodiments of the present invention.

[0022] Figure 7Schematically shows an AA cross-sectional view of the housing of a self-locking heavy-duty tool holder according to some embodiments of the present invention.

[0023] Figure 8 Schematically shows a BB cross-sectional view of the housing of a self-locking heavy-duty tool holder according to some embodiments of the present invention.

[0024] Figure 9 A first perspective view schematically illustrates a centering block of a self-locking heavy-duty tool holder according to some embodiments of the present invention.

[0025] Figure 10 A second perspective view schematically illustrates a centering block of a self-locking heavy-duty tool holder according to some embodiments of the present invention.

[0026] Figure 11 A perspective view schematically illustrates an end cap of a self-locking heavy-duty tool holder according to some embodiments of the present invention.

[0027] Figure 12 Schematically showing a three-dimensional view of the cap body of the self-locking heavy-duty knife sheath according to some embodiments of the present invention.

[0028] Figure 13 Schematically showing a cross-sectional view of the cap body of a self-locking heavy-duty knife sheath according to some embodiments of the present invention.

[0029] Figure 14 The force analysis diagram of the cutting tool of the self-locking heavy-duty tool holder according to some embodiments of the present invention is schematically shown.

[0030] Reference numerals: 1. Shell, 11. Half shell, 12. Reinforcement part, 13. Positioning block, 14. Rear fixing sleeve, 15. Retaining ring, 16. Inner retaining ring, 17. Plunger through hole, 18. Connecting plate, 19. Slide groove, 191. Stop block, 2. End cover, 21. Cover body, 22. End plate, 23. Baffle, 3. Screw, 4. Spring plunger, 5. Centering block, 51. Positioning plate, 52. Limiting boss, 53. Inclined surface, 54. Arc transition part, 55. Connecting block, 56. Plunger mounting groove, 57. Transition slope surface, 6. Expansion cap, 61. Cap body, 62. Retaining part, 63. Inclined part, 64. Rear cover, 7. Tool. DETAILED DESCRIPTION

[0031] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0032] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "the" as used in the text may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0033] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0034] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" may include both above and below orientations. The device may be otherwise oriented rotated 90 degrees or in other orientations and the spatially relative descriptors used herein are interpreted accordingly.

[0035] like Figures 1 to 14As shown, an embodiment of the first aspect of the present invention proposes a self-locking heavy-duty tool sleeve, comprising a shell 1, an expansion cap 6, a centering block 5 and a spring plunger 4, the expansion cap 6 is slidably connected to the shell 1, and a plurality of spring plungers 4 are provided on the side wall of the shell 1 in the form of a circular array, the head of each spring plunger 4 passes through the shell 1 and abuts against a centering block 5, and each centering block 5 is slidable along the radial direction of the shell 1; each centering block 5 includes a positioning plate 51 and a connecting block 55, a positioning plate 51 is provided on one side of the connecting block 55, and a transition slope surface 57 is provided on the bottom surface of the positioning plate 51; the head of each spring plunger 4 is connected to the connecting block 55 of a centering block 5, and when working, the end of the positioning plate 51 facing away from the connecting block 55 abuts against the tool 7, and one end of the expansion cap 6 is provided with an inclined portion 63, and when working, each connecting block 55 abuts against the outer surface of the inclined portion 63.

[0036] In the above embodiment, it should be noted that each spring plunger 4 adopts the structure of an existing spring plunger, which specifically includes: The plunger body has a threaded outer circle and can be directly screwed into the housing 1; it is also fixed by a retaining ring or a pressure cover and does not have an outer thread; the interior is a hollow cavity structure for accommodating the plunger rod and spring, and a stop surface is provided at the bottom of the cavity to limit the spring compression stroke.

[0037] The plunger rod directly contacts the object to be tightened, transmits the spring force, and realizes the tightening, positioning or resetting action.

[0038] The head of the plunger rod can be one of a flat head, a spherical head, a conical head or a serrated head. The rod body of the plunger rod is cylindrical and slides with the cavity of the plunger body.

[0039] The spring is located between the plunger body and the plunger rod, with one end resting against the bottom of the body and the other end resting against the tail of the plunger rod.

[0040] A limit step is provided inside the plunger body to prevent the plunger rod from falling off when the spring is compressed; some models have a retaining ring or a snap ring installed at the end of the plunger rod to limit the maximum extension length.

[0041] An O-ring or dust ring can be installed between the plunger body and the plunger rod to prevent impurities from invading and affecting the spring performance.

[0042] The number of spring plungers 4 is at least three, and at least three spring plungers 4 are inserted on the side wall of the housing 1 in the form of a circular array. Preferably, the number of spring plungers 4 is 3, 4, 5, 6, 7 or 8; the number of centering blocks 5 and spring plungers 4 is the same.

[0043] The cross-sectional shapes of the expansion cap 6 and the housing 1 are both circular.

[0044] The working principle of this knife sleeve is as follows: when the tool 7 is inserted, the pull pin of the tool 7 will contact the multiple centering blocks 5 positioning plates 51, and the inclined surface of the pull pin will contact the transition slope surface 57 on the positioning plate 51. Under the action of the axial component of the spring plunger 4, the spring plunger 4 will be compressed, and the multiple centering blocks 5 will all move backward. After the pull pin is inserted, due to the elastic force of the spring plunger 4, the multiple centering blocks 5 will rebound, locking the tool 7. The flat surfaces of the upper ends of the multiple positioning plates 51 cooperate to clamp the root cylindrical surface of the pull pin, at this time achieving self-locking, and the tool cannot be removed. When the tool 7 needs to be removed, under the action of external force, by pressing down the expansion cap 6, the inclined portion 63 of the expansion cap 6 presses down, causing the multiple centering blocks 5 to be subjected to radial force, causing the multiple centering blocks 5 to move backward, releasing the self-locking, and achieving the purpose of loosening the tool.

[0045] The self-locking principle of this knife set is as follows Figure 14 As shown, when the transition slope surface 57 of the positioning plate 51 of the centering block 5 abuts against the rivet inclined surface of the tool 7, according to the rivet parameters of the tool 7, θ in the figure is 60°; at this time, F1 is greater than F2 multiplied by ; Represents the friction coefficient, which is about 0.15; F1 represents the radial component of the centering block 5 in the housing 1; F2 represents the axial component of the centering block 5 in the housing 1; and the self-locking angle of the pull pin of the tool 7 should be between 8.5° and 10°, so the pull pin can be pulled out without self-locking; when the pull pin of the tool 7 is inserted into place, the plane of the upper end of the positioning plate 51 of the centering block 5 contacts the root of the pull pin of the tool 7, and then the plane of the upper end of the centering block 5 is in the vertical plane of the pull pin of the tool 7. At this time, θ is greater than or equal to 0° and less than 8.5°, which meets the self-locking condition, and F1 is less than F2 multiplied by θ represents the contact angle between the positioning block 5 and the pull pin of the tool 7, F pull represents the axial tension of the pull pin, and F represents the total tension of the pull pin and the positioning block 5 in contact.

[0046] An inclined surface 53 is provided on the connecting block 55, and an inclined portion 63 is provided at one end of the expansion cap 6. When working, the inclined surface 53 of each connecting block 55 is in surface contact with the outer surface of the inclined portion 63 to ensure that the contact of the expansion cap 6 during use is surface contact, thereby ensuring the expansion effect and further increasing the service life of the knife sleeve; in addition, when the knife is loosened, the elastic force of the spring plunger 4 can push the centering block 5 to automatically reset, pushing the inclined portion 63 of the expansion cap 6 to reset and driving the expansion cap 6 to reset, thereby realizing the automatic reset of each component of the knife sleeve and indirectly increasing the service life of the knife sleeve.

[0047] The technical effects achieved by the above embodiments are as follows: the tool sleeve has a simple structure and is easy to assemble and unassemble, and the spring plunger 4 and other wearing parts are easy to replace, which saves costs; the tool sleeve has a self-locking function through the coordinated arrangement of the spring plunger 4 and the centering block 5, which can simultaneously meet the clamping of light-load and heavy-load tools 7, and solves the problem of heavy-load tools easily falling off; it has good versatility, and due to the arrangement of multiple spring plungers 4, the tool sleeve can be suitable for tools 7 of various specifications, and there is no need to match tool sleeves of various specifications according to the load of the tool 7, thereby improving the working efficiency of the machine tool; due to the coordinated arrangement of multiple centering blocks 5 in multiple directions, comprehensive positioning of the tool 7 is achieved, ensuring that the tool is firmly loaded on the tool sleeve, avoiding the risk of heavy-load tools 7 accidentally detaching from the tool sleeve, and thus avoiding the occurrence of tool falling accidents, indirectly ensuring the safety of the operator, and the structure of the centering block 5 replaces the previous structure of the steel ball and bushing, solving the failure problem of easy cracking at the matching point between the bushing and the steel ball, and improving the service life.

[0048] Optional, such as Figures 1 to 3 、 Figure 12 and Figure 13 As shown, the expansion cap 6 includes a cap body 61, a resisting portion 62 and a back cover 64. The resisting portion 62 is provided in the middle of the cap body 61. The first end of the cap body 61 is slidably connected to the shell 1. The second end of the cap body 61 is provided with a back cover 64. The second end of the cap body 61 is connected to the inclined portion 63. The resisting portion 62 is used to limit the sliding stroke of the cap body 61.

[0049] In the above optional embodiment, it should be noted that the cap body 61 , the blocking portion 62 , the inclined portion 63 and the back cover 64 are integrally formed or welded together.

[0050] The beneficial effects of the above optional embodiments are as follows: by setting the rear cover 64, the staff can directly press the rear cover 64 to push the expansion cap 6 to move when loosening the knife, which is more convenient and quick. By setting the resisting portion 62, the stroke of the expansion cap 6 can be limited to avoid the expansion cap 6 moving forward too much, which will increase the compression amount and compression time of the spring plunger 4, indirectly increasing the service life of the spring plunger 4 while increasing the convenience of operation.

[0051] Optional, such as Figures 1 to 4 、 Figure 9 and Figure 10 As shown, the surface of the positioning plate 51 of each centering block 5 facing away from the connecting block 55 is in the shape of an arc.

[0052] In the above optional embodiment, it should be noted that the arc radius of each positioning plate 51 is equal to the radius of the contact surface of the tool 7 .

[0053] The beneficial effect of the above optional embodiment is: by setting the surface of the positioning plate 51 of each centering block 5 away from the connecting block 55 in an arc shape, the contact between the centering block 5 and the tool 7 is all surface contact, avoiding scratches on the surface of the tool 7.

[0054] Optional, such as Figures 1 to 3 and Figure 5 and Figure 7 As shown, the housing 1 includes a half shell 11 and a rear fixing sleeve 14. The rear fixing sleeve 14 is connected to the first end of the half shell 11. A plurality of plunger through holes 17 are opened on the side wall of the rear fixing sleeve 14. Each spring plunger 4 is inserted into a plunger through hole 17. The half shell 11 is used to place the handle part of the tool 7.

[0055] In the above optional embodiment, it should be noted that the half shell 11 and the rear fixing sleeve 14 are welded or integrally formed; a conical hole with a semicircular cross-section is opened in the half shell 11. When inserting the tool, the conical surface of the handle of the tool 7 is located in the conical hole in the half shell 11.

[0056] The beneficial effects of the above optional embodiments are: through the setting of the rear fixing sleeve 14, the front end face of the half shell 11 is in contact with the front end face of the tool holder cone surface, thereby achieving radial support for the front end of the tool 7, and the setting of the half shell 11 enables the rear end of the tool 7 to obtain radial support, thereby achieving centering of the tool 7.

[0057] Optional, such as Figures 1 to 8 As shown, the housing 1 further includes a positioning block 13 . The second end of the half shell 11 is provided with a positioning block 13 . The positioning block 13 is used to circumferentially limit the tool 7 .

[0058] In the above optional embodiment, it should be noted that the shell 1 also includes a reinforcement portion 12, and the reinforcement portion 12 is provided at the end of the half shell 11 facing away from the rear fixing sleeve 14, and the positioning block 13 is connected to the reinforcement portion 12; when the tool 7 is inserted, the positioning block 13 is inserted into the keyway on the handle of the tool 7.

[0059] The beneficial effects of the above optional embodiments are: the circumferential limitation of the tool 7 is achieved through the setting of the positioning block 13, and the five degrees of freedom of the tool 7 except the tool drawing direction are limited by the combined setting of the half shell 11, the rear fixing sleeve 14 and the centering block 5, thereby ensuring the stability of the locking of the tool 7 and increasing the reliability of the tool sleeve for loading heavy-loaded tools 7.

[0060] Optional, such as Figures 1 to 3 、 Figure 9 and Figure 10 As shown, a plunger mounting groove 56 is provided on the side of the connecting block 55 of each centering block 5 facing away from the positioning plate 51 , and the head of the spring plunger 4 is inserted into the plunger mounting groove 56 and abuts against the bottom surface of the plunger mounting groove 56 .

[0061] The beneficial effect of the above optional embodiment is that the reliability of the connection between the head of the spring plunger 4 and the centering block 5 is guaranteed by the provision of the plunger mounting groove 56 .

[0062] Optional, such as Figure 1 、 Figure 3 、 Figure 5 ,and Figures 8 to 10 As shown, it also includes a block 191, and each centering block 5 also includes a limiting boss 52. A plurality of slide grooves 19 are provided in the fixed sleeve, and the plurality of slide grooves 19 are connected one-to-one with the plurality of plunger through holes 17. The plurality of slide grooves 19 are connected with the accommodating cavity in the rear fixed sleeve 14. The inner side wall of each slide groove 19 is provided with a block 191, and limiting bosses 52 are provided on both sides of the connecting block 55. The plurality of centering blocks 5 can be slidably inserted into the plurality of slide grooves 19 in a one-to-one manner. When working, the block 191 and the limiting boss 52 abut against each other in a one-to-one manner.

[0063] In the above optional embodiment, it should be noted that the limiting boss 52 and the connecting block 55 are integrally formed or welded.

[0064] The beneficial effects of the above optional embodiment are as follows: the spring plunger 4 is assembled along the radial plunger through-hole 17 of the rear fixing sleeve 14, and after tightening, the part of the spring plunger 4 in the rear fixing sleeve 14 cooperates with the plunger mounting groove 56 at the rear end of the centering block 5 to form an elastic mechanism. In the natural state, the spring of the spring plunger 4 naturally extends, and the head of the spring plunger 4 presses against the limiting boss 52 of the centering block 5 and fits with the stopper 191 in the slide groove 19 to achieve the limiting of the centering block 5, thereby achieving the goal of inserting the tool 7 into the space between multiple centering blocks 5 accurately when inserting the tool, ensuring that the tool 7 is quickly and reliably inserted and locked.

[0065] Optional, such as Figure 5 、 Figure 7 and Figures 9 to 11 As shown, it also includes an end cover 2 and an inner stop ring 16. The end cover 2 is connected to one end of the shell 1. The inner stop ring 16 is arranged in the shell 1. The first end of the connecting block 55 of each centering block 5 is slidably connected to the inner stop ring 16, and the second end of the connecting block 55 of each centering block 5 is slidably connected to the end cover 2.

[0066] In the above optional embodiment, it should be noted that the shell 1 also includes a connecting plate 18 and a retaining ring 15. The half shell 11 and the rear fixing sleeve 14 are connected by the connecting plate 18. The retaining ring 15 is connected to the side facing away from the rear fixing sleeve 14, and the retaining ring 15 is in contact with the tool 7. It also includes a screw 3 end cover connected to the shell 1 through the screw 3; the inner retaining ring 16 is integrally formed with the connecting plate 18 and is located inside the connecting plate 18.

[0067] The beneficial effects of the above optional embodiments are: the end cover 2 is connected to the shell 1, and the inner retaining ring 16, the end cover 2 and the centering block 5 connecting block 55 are slidingly matched, so that the centering block 5 can slide stably; the connecting plate 18 connects the half shell 11 and the rear fixing sleeve 14, and the retaining ring 15 abuts against the tool 7, which can fix the tool 7, enhance the structural stability, and ensure that the tool 7 is accurately positioned.

[0068] Optional, such as Figure 1 and Figure 11 As shown, the end cover 2 includes a cover body 21 and an end plate 22. The end plate 22 is provided on one side of the cover body 21. The end plate 22 is inserted into the shell 1. The cover body 21 abuts against one end of the shell 1. The second end of the connecting block 55 of each centering block 5 is slidably connected to the end plate 22.

[0069] In the above optional embodiment, it should be noted that the end cover 2 also includes a baffle 23 , the baffle 23 is arranged in the cover body 21 , the blocking portion 62 is located in the baffle 23 , and the cap body 61 of the expansion cap 6 can be slidably inserted on the baffle 23 .

[0070] The beneficial effects of the above optional embodiments are as follows: through the setting of the cover body 21 and the end plate 22 of the end cover 2, the end plate 22 is inserted into the shell 1, the cover body 21 abuts against the shell 1, and is slidably connected with the connecting block 55 of the centering block 5 to ensure the sliding guidance of the centering block 5; the baffle 23 in the cover body 21 slides with the abutment 62 and the cap body 61 of the expansion cap 6, which can limit the moving range of the expansion cap 6 and improve the structural stability. The setting that the cap body 61 of the expansion cap 6 can be slidably inserted on the baffle 23 increases the convenience of operation.

[0071] Optional, such as Figure 1 、 Figure 9 and Figure 10 As shown, each centering block 5 also includes an arc transition portion 54, and each connecting block 55 is provided with an arc transition portion 54 on the side close to the positioning plate 51. The arc transition portion 54 is located on the side of the inclined surface 53 away from the positioning plate 51, and the arc transition portion 54 is connected to the inclined surface 53.

[0072] The beneficial effect of the above optional embodiment is that the setting of the arc transition portion 54 makes the expansion cap 6 slide more smoothly without jamming, which indirectly increases the reliability and service life of the knife sleeve.

[0073] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A self-locking heavy-duty tool holder, characterized in that: include: housing (1); An expansion cap (6) is slidably connected to the housing (1), and one end of the expansion cap (6) is provided with an inclined portion (63); Spring plungers (4), a plurality of spring plungers (4) are provided on the side wall of the housing (1) in a circumferential array; A centering block (5), wherein the head of each spring plunger (4) passes through the housing (1) and abuts against a centering block (5), and each centering block (5) is slidable along the radial direction of the housing (1); Each of the centering blocks (5) comprises: A connecting block (55), wherein the head of each spring plunger (4) is connected to one of the connecting blocks (55); A positioning plate (51), wherein the positioning plate (51) is provided on one side of the connecting block (55), and a transition slope surface (57) is provided on the bottom surface of the positioning plate (51); During operation, each of the connecting blocks (55) abuts against the outer surface of the inclined portion (63).

2. The self-locking heavy-duty tool holder according to claim 1, characterized in that: The expansion cap (6) comprises: A cap body (61), a first end of which is connected to the inclined portion (63), and a second end of which is slidably connected to the housing (1); A rear cover (64) is provided at the second end of the cap body (61); The blocking portion (62) is arranged in the middle of the cap body (61) and is used to limit the sliding stroke of the cap body (61).

3. The self-locking heavy-duty tool holder according to claim 1, characterized in that: In each of the centering blocks (5), the surface of the positioning plate (51) facing away from the connecting block (55) is in the shape of an arc.

4. The self-locking heavy-duty tool holder according to any one of claims 1 to 3, characterized in that: The housing (1) comprises: A rear fixed sleeve (14) has a plurality of plunger through holes (17) formed on its side wall, and each of the spring plungers (4) is inserted into one of the plunger through holes (17); A half shell (11), the rear fixing sleeve (14) is connected to a first end of the half shell (11), and the half shell (11) is used to place a handle of a tool (7) on the rear fixing sleeve (14).

5. The self-locking heavy-duty tool holder according to claim 4, characterized in that: Also includes: A plurality of slide grooves (19) are provided in the rear fixed sleeve (14), the plurality of slide grooves (19) are connected to the plurality of plunger through holes (17) in a one-to-one correspondence, the plurality of slide grooves (19) are all connected to the accommodating cavity in the rear fixed sleeve (14), and the plurality of centering blocks (5) are slidably inserted in the plurality of slide grooves (19) in a one-to-one correspondence; A stopper (191), wherein the inner side wall of each of the slide grooves (19) is provided with the stopper (191); Each of the centering blocks (5) further comprises: The limiting bosses (52) are provided on both sides of the connecting block (55). When in operation, the stopper (191) abuts against the limiting bosses (52) in a one-to-one correspondence.

6. The self-locking heavy-duty tool holder according to claim 4, characterized in that: The housing (1) further comprises: A positioning block (13) is provided at the second end of the half shell (11), and the positioning block (13) is used for circumferentially limiting the tool (7).

7. The self-locking heavy-duty tool holder according to claim 1, characterized in that: Also includes: A plunger mounting groove (56), wherein each of the connecting blocks (55) is provided with a plunger mounting groove (56) on a side facing away from the positioning plate (51); The head of the spring plunger (4) is inserted into the plunger mounting groove (56) and abuts against the bottom surface of the plunger mounting groove (56).

8. The self-locking heavy-duty tool holder according to claim 1, characterized in that: Also includes: an end cover (2), the end cover (2) being connected to one end of the housing (1), An inner stop ring (16) is provided in the housing (1), a first end of each connecting block (55) is slidably connected to the inner stop ring (16), and a second end of each connecting block (55) is slidably connected to the end cover (2).

9. The self-locking heavy-duty tool holder according to claim 8, characterized in that: The end cover (2) comprises: A cover (21) abuts against one end of the shell (1); An end plate (22) is provided on one side of the cover body (21), the end plate (22) is inserted into the shell (1), and the second end of the connecting block (55) of each centering block (5) is slidably connected to the end plate (22).

10. The self-locking heavy-duty tool holder according to claim 1, characterized in that: Each of the centering blocks (5) further comprises: An inclined surface (53), the connecting block (55) is provided with the inclined surface (53), and the inclined portion (63) is in surface contact with the inclined surface (53); A circular arc transition portion (54) is provided on one side of the connecting block (55) close to the positioning plate (51), and the circular arc transition portion (54) is connected to the inclined surface (53).

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