Clamping jaw, double-layer double-station chain type tool magazine and double-spindle machining center

Abstract

The invention relates to the technical field of numerical control machining, and provides a clamping jaw, a double-layer double-station chain type tool magazine and a double-spindle machining center. The clamping jaw comprises a main jaw body, clamping fingers and an elastic piece. A bayonet is formed in the first end of the main claw body, and the second end of the main claw body is configured to be connected with a conveying chain; the clamping finger is rotatably arranged at the first end of the main claw body, and the elastic piece is connected between the first end of the clamping finger and the main claw body in an abutting mode so as to control the second end of the clamping finger to be movably arranged on one side of the bayonet; the second end of the clamping finger is matched with the clamping opening so as to clamp or release a cutter handle of the cutter. The clamping requirement for a tool is met, the arrangement posture of the two clamping jaws can be flexibly arranged in an opposite arrangement mode according to the actual requirement, high-speed tool searching and tool changing are conducted on double spindles of the double-spindle machining center, the tool changing flexibility is good, the tool changing application range of the clamping jaws can be ensured, and the tool changing efficiency is improved. And the double-spindle tool changing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control machining, and in particular to a clamping claw, a double-layer double-station chain tool magazine and a dual-spindle machining center. Background Art

[0002] In the field of CNC machining, in order to improve machining efficiency, dual-spindle machining centers have emerged on the market. Compared with traditional machining centers, they are equipped with two spindles, two tool magazines and their corresponding two machining stations. They can process two identical parts at the same time, doubling the production capacity per unit time without much increase in equipment cost.

[0003] The tool magazine of the existing dual-spindle machining center is usually a chain tool magazine, which uses a conveyor chain to transport the clamping claw to the tool changing station to meet the tool changing needs. However, in actual applications, it is found that most of the existing clamping claws are clamping claws with two clamping heads, such as pneumatic clamping claws, elastic clamping claws, etc. The design of this type of clamping claw is unreasonable. It is limited by the layout structure of the two clamping heads and is mainly used to meet the tool changing needs of a single spindle of the machining center. When changing tools for the two spindles of the dual-spindle machining center, the two clamping claws can only be set toward the movement direction of the spindle. This design has poor tool changing flexibility and greatly limits the scope of application of tool changing using clamping claws. Summary of the invention

[0004] The present invention provides a clamping claw, a double-layer double-station chain tool magazine and a dual-spindle machining center, which are used to at least solve or improve the problems of poor tool changing flexibility and limited application range of tool changing when using existing clamping claws for dual-spindle tool changing.

[0005] In a first aspect, the present invention provides a claw, comprising: a main claw body, a claw finger and an elastic member; The first end of the main claw body is provided with a bayonet, and the second end of the main claw body is configured to be connected to a conveying chain; The latch finger is rotatably disposed at the first end of the main claw body, and the elastic member is abutted between the first end of the latch finger and the main claw body to control the second end of the latch finger to be movably disposed at one side of the bayonet; The second end of the clamping finger cooperates with the clamping port to clamp or release the handle of the tool.

[0006] According to a clamping claw provided by the present invention, the clamping finger comprises a front end knuckle and a terminal knuckle; The front end knuckle and the terminal knuckle are bent and connected, the front end knuckle is connected to the main claw body through the elastic member, and the terminal knuckle is movably arranged on one side of the bayonet.

[0007] According to a claw provided by the present invention, a side surface of the terminal knuckle facing the bayonet is formed as a guide surface, and the guide surface is configured to contact the peripheral wall of the tool handle to guide the tool handle into the bayonet.

[0008] According to a claw provided by the present invention, the inner wall of the bayonet is provided with a first protrusion, and the side surface of the terminal knuckle facing the bayonet is provided with a second protrusion; When the clamping claw clamps the tool handle, the first protrusion and the second protrusion are configured to be respectively clamped in the clamping grooves of the peripheral wall of the tool handle to limit the clamping position of the tool in the vertical direction.

[0009] According to a clamping claw provided by the present invention, the inner wall of the clamping mouth is provided with a positioning protrusion, and when the clamping claw clamps the tool handle, the positioning protrusion is configured to be clamped in the positioning groove of the peripheral wall of the tool handle to limit the clamping posture of the tool along the circumferential direction.

[0010] According to a clamping claw provided by the present invention, the main claw body is provided with a limiting shaft, the clamping finger is provided with a limiting hole, and the limiting shaft is passed through the limiting hole; Wherein, the limiting shaft and the limiting hole cooperate with each other to limit the rotation angle of the clamping finger relative to the main claw body.

[0011] According to a claw provided by the present invention, the claw finger is rotatably arranged on the side of the main claw body around a first axis, and the limiting hole is extended along the circumference of the first axis.

[0012] In a second aspect, the present invention further provides a double-layer double-station chain tool magazine, comprising: a first chain tool magazine and a second chain tool magazine, wherein the second chain tool magazine is stacked on the upper side of the first chain tool magazine; The first chain tool magazine and the second chain tool magazine have the same structure, both comprising a base, a driving mechanism, a conveying chain and a claw assembly; the conveying chain and the driving mechanism are respectively arranged on the base, and the driving mechanism is connected to the conveying chain to drive the conveying chain to move relative to the base; the claw assembly is provided with a plurality of sets, and the plurality of sets of the claw assemblies are sequentially arranged along the extending direction of the conveying chain; Wherein, each set of the clamping jaw assembly comprises two clamping jaws as described above which are arranged facing each other, and the two clamping jaws are used to simultaneously change tools for the two spindles of the dual-spindle machining center.

[0013] According to a double-layer double-station chain tool magazine provided by the present invention, the first end of the first chain tool magazine and the first end of the second chain tool magazine are both arranged toward the tool changing station; The distance between the first end of the second chain tool magazine and the tool changing station is greater than the distance between the first end of the first chain tool magazine and the tool changing station.

[0014] In a third aspect, the present invention further provides a dual-spindle machining center, comprising: a machine tool and a double-layer double-station chain tool magazine as described above, wherein the first chain tool magazine and the second chain tool magazine are respectively arranged on the rear side of the machine tool and are symmetrically arranged relative to the axial symmetry plane of the machine tool.

[0015] The clamping claw, double-layer double-station chain tool magazine and dual-spindle machining center provided by the present invention configure the clamping claw as a main claw body, a clamping finger and an elastic member, and the clamping finger rotates relative to the main claw body under the control of the elastic member. This design can utilize the mutual cooperation between the second end of the clamping finger and the clamping socket on the main claw body to clamp or release the tool handle, which is convenient for application in dual-spindle tool changing.

[0016] Compared with the existing clamping jaws, the clamping jaws shown in the present invention remove a clamping head of the existing clamping jaws. This design can not only meet the clamping needs of the tool, but also facilitate the flexible setting of the layout posture of the two clamping jaws in a facing arrangement according to actual needs, and perform high-speed tool searching and tool changing for the dual spindles of the dual-spindle machining center. Not only is the tool changing flexibility good, but it can also ensure the applicable range of tool changing of the clamping jaws, thereby improving the efficiency of tool changing for the dual spindles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a partial cross-sectional structural schematic diagram of the clamping claw provided by the present invention; Figure 2 It is a schematic diagram of the exploded structure of the clamping claw provided by the present invention; Figure 3 It is a structural schematic diagram of a double-layer double-station chain tool magazine provided by the present invention; Figure 4 It is a structural schematic diagram of multiple sets of claw assemblies provided by the present invention being arranged in sequence along the extending direction of the conveyor chain; Figure 5 It is a schematic diagram of the structure of a set of claw assemblies provided by the present invention arranged at a tool changing station relative to a conveyor chain; Figure 6 It is a structural schematic diagram of a double-layer double-station chain tool magazine provided by the present invention for changing tools for two spindles at a tool changing station; Reference numerals: 10. First chain tool magazine; 20. Second chain tool magazine; 30. Spindle; 100. Tool changing station; 1. Claw assembly; 11. Claw; 111. Main claw body; 112. Clamping finger; 113. Elastic member; 1110. Clamping port; 1111. First protrusion; 1112. Positioning protrusion; 11101. First groove; 11102. Second groove; 1121. Front finger joint; 1122. Terminal finger joint; 11201. Guide surface; 11202. Second protrusion; 1101. Articulated shaft; 1102. Articulated hole; 1103. Limiting shaft; 1104. Limiting hole; 2. Conveyor chain; 3. Driving mechanism; 4. Base; 5. Annular track. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Combine the following Figure 1-Figure 6 The clamping claws, double-layer double-station chain tool magazine and dual-spindle machining center provided by the embodiments of the invention are described in detail through specific embodiments and their application scenarios.

[0021] In the first aspect, Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a claw, the claw 11 comprises: a main claw body 111, a clamping finger 112 and an elastic member 113; A bayonet 1110 is provided at the first end of the main claw body 111, and the second end of the main claw body 111 is configured to be connected to the conveyor chain 2; the latch finger 112 is rotatably disposed at the first end of the main claw body 111, and the elastic member 113 abuts between the first end of the latch finger 112 and the main claw body 111 to control the second end of the latch finger 112 to be movably disposed on one side of the bayonet 1110; wherein the second end of the latch finger 112 cooperates with the bayonet 1110 to clamp or release the handle of the tool.

[0022] It is understandable that the main claw body 111 and the latch finger 112 can be made of metal material, and the elastic member 113 can be any one of a spring, a spring sheet or an elastic rod.

[0023] like Figure 1 and Figure 2As shown, a hinge shaft 1101 may be provided at the first end of the main claw body 111 , a hinge hole 1102 is provided on the latch finger 112 , the hinge shaft 1101 passes through the hinge hole 1102 , and the latch finger 112 is rotatably connected to the main claw body 111 via the hinge shaft 1101 .

[0024] Since the handle of the tool is usually cylindrical, the bayonet 1110 on the main claw body 111 is notched, and the specific shape of the bayonet 1110 can be configured as an arc shape, so as to clamp the handle of the tool based on the bayonet 1110. Of course, the bayonet 1110 can also be configured to have a bayonet 1110 structure similar to a regular polygon.

[0025] Since the elastic member 113 is in contact between the first end of the latch finger 112 and the main claw body 111, when the knife handle is inserted into the bayonet 1110, the second end of the latch finger 112 will swing toward the side close to the bayonet 1110 under the elastic force of the elastic member 113, and press against the peripheral wall of the knife handle, so as to confine the knife handle in the bayonet 1110. Of course, when the spindle 30 takes out the knife, it is only necessary to drive the knife away from the main claw body 111, and the knife handle of the knife will force the second end of the latch finger 112 to swing toward the side away from the bayonet 1110 until the knife handle leaves the bayonet 1110.

[0026] The clamping claw 11 shown in the present invention is configured with a main claw body 111, a clamping finger 112 and an elastic member 113. The clamping finger 112 rotates relative to the main claw body 111 under the control of the elastic member 113. This design can utilize the mutual cooperation between the second end of the clamping finger 112 and the clamping socket 1110 on the main claw body 111 to clamp or release the tool handle, which is convenient for application in dual-spindle tool changing.

[0027] Considering that the existing clamps usually have two clamping heads, when applied to the tool changing operation of the dual spindles 30, two clamps distributed side by side must be set at the tool changing station 100, and the two clamps must be set toward the moving direction of the two spindles 30. If the layout direction of the clamps is tilted or misaligned relative to the moving direction of the spindle 30, it is difficult to ensure that the clamps clamp the tool, and the spindle and the clamps may interfere with each other during the tool change.

[0028] Compared with the existing clamping jaws, the clamping jaw 11 shown in the present invention removes a clamping head of the existing clamping jaw. This design can realize the inclined setting of the layout direction of the clamping jaw 11 relative to the moving direction of the spindle 30, which can not only meet the clamping needs of the tool, but also facilitate the flexible setting of the layout posture of the two clamping jaws in a facing arrangement according to actual needs, and perform high-speed tool searching and tool changing for the dual spindles 30 of the dual-spindle machining center. Not only is the tool changing flexibility good, but also the applicable range of tool changing of the clamping jaw can be ensured, thereby improving the efficiency of tool changing for the dual spindles.

[0029] In some embodiments, Figure 1and Figure 2 As shown, the latch finger 112 includes a front knuckle 1121 and a terminal knuckle 1122 ; the front knuckle 1121 and the terminal knuckle 1122 are bent and connected, the front knuckle 1121 is connected to the main claw body 111 through an elastic member 113 , and the terminal knuckle 1122 is movably disposed on one side of the latch port 1110 .

[0030] It is understandable that the front knuckle 1121 serves as the first end of the latch finger 112 , the terminal knuckle 1122 serves as the second end of the latch finger 112 , and the elastic member 113 abuts between an end of the front knuckle 1121 away from the terminal knuckle 1122 and the main claw body 111 .

[0031] At the same time, the extension direction of the front finger joint 1121 and the extension direction of the terminal finger joint 1122 are configured to be set at an angle, for example, the angle can be an obtuse angle. This design can ensure that the terminal finger joint 1122 is always arranged on one side of the bayonet 1110 during the rotation of the clamping finger 112 relative to the main claw body 111, and then based on the mutual cooperation between the terminal finger joint 1122 and the bayonet 1110, the clamping effect of the clamping claw 11 on the knife handle is ensured.

[0032] Exemplarily, the bayonet 1110 has a first end and a second end, an inner wall extending along an arc-shaped trajectory is formed between the first end and the second end of the bayonet 1110, and the terminal finger joint 1122 is disposed at the second end of the bayonet 1110. When the knife handle is clamped, the inner wall of the bayonet 1110 and the terminal finger joint 1122 are sequentially extended along the circumference of the knife handle toward one side of the bayonet 1110.

[0033] In some embodiments, Figure 2 As shown, a side surface of the terminal knuckle 1122 facing the bayonet 1110 is formed as a guide surface 11201 , and the guide surface 11201 is configured to contact the peripheral wall of the knife handle to guide the knife handle into the bayonet 1110 .

[0034] It is understandable that when the claw 11 does not clamp the knife handle, due to the action of the elastic member 113, the terminal knuckle 1122 of the clamping finger 112 is located on the side close to the bayonet 1110. By constructing a guide surface 11201 on the side of the terminal knuckle 1122 facing the bayonet 1110, it is convenient to guide the knife handle into the bayonet 1110 based on the guide surface 11201, thereby preventing the knife handle from interfering with the terminal knuckle 1122 during the process of entering the bayonet 1110.

[0035] Accordingly, when the knife handle leaves the bayonet 1110 , the peripheral wall of the knife handle slides in contact with the guide surface 11201 , effectively preventing the terminal knuckle 1122 from affecting the knife handle's separation from the bayonet 1110 .

[0036] Exemplarily, the guide surface 11201 is a smooth curved surface, and the terminal knuckle 1122 has a back side facing away from the bayonet 1110. Along the extension direction from the end of the terminal knuckle 1122 away from the front knuckle 1121 to the end of the terminal knuckle 1122 close to the front knuckle 1121, the distance between the guide surface 11201 and the back side gradually increases.

[0037] In some embodiments, Figure 2 As shown, the inner wall of the bayonet 1110 is provided with a first protrusion 1111, and the end finger joint 1122 is provided with a second protrusion 11202 on a side facing the bayonet 1110; When the clamping claw 11 clamps the tool handle, the first protrusion 1111 and the second protrusion 11202 are respectively clamped in the clamping grooves of the peripheral wall of the tool handle to limit the clamping position of the tool in the vertical direction.

[0038] It is understandable that, since the engaging groove extends along a circular track on the peripheral wall of the knife handle, the inner wall of the bayonet 1110 is set to extend along an arc track, and the first protrusion 1111 is set in the middle of the inner wall of the bayonet 1110 and extends along the extension direction of the inner wall. Correspondingly, the side of the terminal knuckle 1122 facing the bayonet 1110 is configured with a guide surface 11201, and the second protrusion 11202 is set in the middle of the guide surface 11201, and the second protrusion 11202 and the guide surface 11201 are both extended along the extension direction of the terminal knuckle 1122.

[0039] Obviously, since the first protrusion 1111 and the second protrusion 11202 are engaged with the engaging groove of the peripheral wall of the knife handle, when the claw 11 clamps the knife handle, it can allow the knife handle to rotate in the bayonet 1110 during the clamping process, and can also limit the clamping position of the knife handle in the vertical direction.

[0040] The snap-fit ​​groove is a "V"-shaped groove or a trapezoidal groove, and the cross-sectional shapes of the first protrusion 1111 and the second protrusion 11202 are both adapted to the cross-sectional shape of the snap-fit ​​groove.

[0041] In some embodiments, Figure 2 As shown, the inner wall of the bayonet 1110 is provided with a positioning protrusion 1112. When the claw 11 clamps the tool handle, the positioning protrusion 1112 is configured to be clamped in the positioning groove of the peripheral wall of the tool handle to limit the clamping posture of the tool along the circumferential direction.

[0042] It is understandable that the positioning protrusion 1112 can be a columnar protrusion, and the cross-sectional shape of the positioning protrusion 1112 is adapted to the cross-sectional shape of the positioning groove.

[0043] When the positioning protrusion 1112 is embedded in the positioning groove, the bayonet 1110 and the tool handle are positioned along the circumferential direction, and the tool handle will not rotate in the bayonet 1110. Therefore, when the claw 11 clamps the tool handle, the mutual cooperation between the positioning protrusion 1112 and the positioning groove limits the clamping posture of the tool.

[0044] In some embodiments, Figure 1 and Figure 2 As shown, the main claw body 111 is provided with a limiting shaft 1103, and the locking finger 112 is provided with a limiting hole 1104, and the limiting shaft 1103 is passed through the limiting hole 1104; wherein the limiting shaft 1103 and the limiting hole 1104 cooperate to limit the rotation angle of the locking finger 112 relative to the main claw body 111.

[0045] It is understandable that the main claw body 111 may be provided with threaded holes corresponding to the hinge shaft 1101 and the limit shaft 1103 respectively, and the hinge shaft 1101 and the limit shaft 1103 are threadedly connected to the corresponding threaded holes respectively.

[0046] At the same time, the limiting shaft 1103 is used to limit the rotation range of the locking finger 112. The limiting shaft 1103 is movably arranged in the limiting hole 1104. The limiting hole 1104 can be a circular hole, a bar hole, etc., and no specific limitation is made to this.

[0047] When the claw 11 does not clamp the knife handle, the limiting shaft 1103 abuts against one end of the limiting hole 1104 to limit the rotation of the clamping finger 112 toward the side close to the bayonet 1110, ensuring that when the knife handle enters the bayonet 1110, the knife handle can normally contact the guide surface 11201 of the terminal finger joint 1122 and enter the bayonet 1110 under the guidance of the guide surface 11201.

[0048] Accordingly, when the spindle 30 returns the tool, the latch finger 112 is driven by the tool handle to rotate toward the side away from the latch port 1110 until the limiting shaft 1103 abuts against the other end of the limiting hole 1104 to limit the latch finger 112 from continuing to rotate toward the side away from the latch port 1110.

[0049] Furthermore, if Figure 1 and Figure 2 As shown, the latch finger 112 is rotatably disposed on the side of the main claw body 111 around the first axis, and the limiting hole 1104 is extended along the circumference of the first axis.

[0050] It is understandable that the limiting hole 1104 is fan-shaped, and the limiting shaft 1103 is adapted to the radial width of the limiting hole 1104. This design not only ensures that the locking finger 112 can rotate relative to the main claw body 111 under the guidance of the hinge shaft 1101, but also can utilize the structural form of the limiting hole 1104 to stably and reliably limit the relative movement of the limiting shaft 1103.

[0051] At the same time, Figure 1 and Figure 2 As shown, a first groove 11101 and a second groove 11102 are provided on the side of the main claw body 111, and the first groove 11101 is provided on the bottom surface of the second groove 11102, and the first groove 11101 is used to accommodate the elastic member 113, and at least part of the latch finger 112 is provided in the second groove 11102, for example, the front end knuckle 1121 of the latch finger 112 is provided in the second groove 11102, and the elastic member 113 is a spring, one end of the spring abuts against the bottom of the first groove 11101, and the other end abuts against the front end knuckle 1121; this design assembles the main claw body 111, the latch finger 112 and the elastic member 113 compactly together, which not only ensures the reliability of the operation of the latch claw 11, but also realizes the miniaturized design of the latch claw 11.

[0052] In the second aspect, Figure 3 and Figure 4 As shown, the embodiment of the present invention further provides a double-layer double-station chain tool magazine, comprising: a first chain tool magazine 10 and a second chain tool magazine 20, wherein the second chain tool magazine 20 is stacked on the upper side of the first chain tool magazine 10; The first chain tool magazine 10 and the second chain tool magazine 20 have the same structure, both including a base 4, a driving mechanism 3, a conveying chain 2 and a claw assembly 1; the first chain tool magazine 10 is taken as an example for specific description. Specifically, the conveying chain 2 and the driving mechanism 3 of the first chain tool magazine 10 are respectively arranged on the base 4, and the driving mechanism 3 is connected to the conveying chain 2 to drive the conveying chain 2 to move relative to the base 4; the claw assembly 1 is provided with multiple sets, and the multiple sets of claw assemblies 1 are arranged in sequence along the extension direction of the conveying chain 2; Each set of jaw assemblies 1 includes two jaws as described above that are arranged facing each other, and the two jaws are used to simultaneously change tools for the two spindles 30 of the dual-spindle machining center.

[0053] It is understandable that, since the first chain tool magazine 10 and the second chain tool magazine 20 are each provided with an independent driving mechanism 3, the first chain tool magazine 10 and the second chain tool magazine 20 can independently cooperate with the two spindles 30 of the dual-spindle machining center to complete the tool changing operation.

[0054] The driving mechanism 3 is fixedly mounted on the base 4, and the driving mechanism 3 can be a reduction motor; the conveying chain 2 includes a plurality of chain links, and the plurality of chain links are sequentially connected end to end to form a ring-shaped conveying chain 2; each chain link is provided with a guide wheel, and a ring track 5 is provided on the base 4, for example, the ring track 5 is extended along a waist-circular track, and the ring track 5 specifically adopts a grooved guide rail; the guide wheels of each chain link are configured to be arranged on the ring track 5, and can move along the extension direction of the ring track 5.

[0055] At the same time, the driving mechanism 3 can use a toothed disc to engage with the conveyor chain 2 to drive the conveyor chain 2 to move along the guide path provided by the circular track 5, so that the conveyor chain 2 can drive multiple sets of claw assemblies 1 to move in sequence along an oblong circular trajectory to the tool changing station 100.

[0056] like Figure 4 and Figure 5 As shown, the tool changing station 100 is located at one end of the conveyor chain 2; when one set of jaw assemblies 1 is located at the tool changing station 100, the jaws 11 corresponding to the set of jaw assemblies 1 are both facing the direction of the spindle 30, and the two jaws 11 are spaced apart from each other and are arranged in a mirror-symmetrical manner, which can ensure the consistency of the movements of the two jaws and the efficiency of tool changing for the two spindles 30.

[0057] In practical applications, the number of claw assemblies 1 provided on the conveyor chain 2 can be flexibly adjusted according to the capacity requirements of the tool magazine; for each set of claw assemblies 1, each claw 11 is installed on a link of the conveyor chain 2, and the number of links between two claws 11 can be flexibly set, and the spacing between the two claws 11 can be adjusted so that the spacing between the two claws 11 is adapted to the spacing between the two spindles 30. Since the claws 11 and the links are split, this design can be flexibly adjusted according to requirements to meet the compatibility requirements of different tool holders.

[0058] like Figure 3 and Figure 6 As shown, the tool changing process is specifically described below by taking the first chain tool magazine 10 as an example.

[0059] When the two spindles 30 of the dual-spindle machining center need to change tools, the conveyor chain 2 conveys a set of claw assemblies 1 to the tool changing station 100. At this time, the two claws 11 of the claw assembly 1 are set at an obtuse angle, and the bayonet holes 1110 of the two claws 11 are both facing the direction of the spindle 30. The two spindles 30 and the first chain tool magazine 10 move towards each other until the tools on the two spindles 30 are clamped in the corresponding bayonet holes 1110 by the two claws 11. The two spindles 30 are detached from their respective tools and move upward to return the tools to the tool magazine.

[0060] Next, the driving mechanism 3 drives the conveyor chain 2 to operate, and transports the next set of claw assemblies 1 clamping the required tools to the tool changing station 100. The two spindles 30 move downward, and after connecting with the two corresponding tools, they move toward the side away from the first chain tool magazine 10 to complete the tool changing operation.

[0061] In some embodiments, Figure 3As shown, the first end of the first chain tool magazine 10 and the first end of the second chain tool magazine 20 are both arranged toward the tool changing station 100; the distance between the first end of the second chain tool magazine 20 and the tool changing station 100 is greater than the distance between the first end of the first chain tool magazine 10 and the tool changing station 100. This design forms an avoidance space between the first chain tool magazine 10 and the second chain tool magazine 20, leaving working space for the two spindles 30 to perform tool changing operations based on the first chain tool magazine 10.

[0062] In a third aspect, the present invention further provides a dual-spindle machining center, comprising: a machine tool and a double-layer double-station chain tool magazine as described above, wherein the first chain tool magazine 10 and the second chain tool magazine 20 are respectively arranged on the rear side of the machine tool and are symmetrically arranged relative to the axial symmetry plane of the machine tool.

[0063] It is understandable that the double-layer double-station chain tool magazine can be fixedly set on the rear side of the machine tool, or movably set on the rear side of the machine tool along the axis of symmetry of the machine tool, and the second chain tool magazine 20 can also be movably set on the first chain tool magazine 10 along the axis of symmetry of the machine tool.

[0064] The double-layer double-station chain tool magazine is set in the middle of the travel of the machine tool's transverse coordinate axis, so that the dual-spindle machining center can be designed symmetrically, which is beneficial to the overall force balance of the machine tool, reduces the influence of the tool magazine weight on the machine tool's geometric accuracy, and improves the machine tool's accuracy retention and stability of use; when changing tools with the dual spindles, the spindle only needs to move towards the tool magazine to the tool changing station, and the tool changing stroke is short, which is beneficial to shortening the tool changing time.

[0065] At the same time, the double-layer design of the double-layer double-station chain tool magazine expands the tool position capacity and fully utilizes the height space of the machine tool. In addition, the first chain tool magazine 10 and the second chain tool magazine 20 can both realize simultaneous tool changing of dual spindles, with fast tool changing speed and high-speed tool searching.

[0066] In addition, traditional double tool magazines are mostly divided into two types. One of them is to hang two sets of tool magazines on the machine tool column and close to the two sides of the spindle, and two cam-type robots are used to change tools respectively. In this solution, the tool magazine is exposed in the processing area, and the working environment is harsh, which is not conducive to the cleaning and precision maintenance of the tool magazine and tool holder. The weight of the tool magazine will affect the precision of the column. The tool magazine has a small tool capacity. Due to the limited space in the processing area, the tool magazine capacity is difficult to expand; one of them is to install the tool magazine on the outside of the machine tool bed, and the tool transfer mechanism is used to transport and change tools. This double tool magazine solution has more moving axes, more difficult motion control, more moving points, and it is difficult to ensure the consistency of motion. The non-fault time period of the machine tool is short, and the tool changing stroke is long. The tool changing speed is difficult to increase, which is not conducive to efficient processing. The overall structure of the tool changing system is complex and occupies a large space.

[0067] Obviously, compared with the traditional double tool magazine structure, the double-layer double-station chain tool magazine of the present invention has a simpler structure, easier motion control, high action consistency, short assembly and debugging cycle, and occupies less machine tool space and has a low failure rate.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A claw, characterized in that: include: Main claw body, clamping fingers and elastic member; The first end of the main claw body is provided with a bayonet, and the second end of the main claw body is configured to be connected to a conveying chain; The latch finger is rotatably disposed at the first end of the main claw body, and the elastic member abuts between the first end of the latch finger and the main claw body to control the second end of the latch finger to be movably disposed at one side of the bayonet; The second end of the clamping finger cooperates with the clamping port to clamp or release the handle of the tool.

2. The claw according to claim 1, characterized in that: The clamping finger includes a front knuckle and a terminal knuckle; The front end knuckle and the terminal knuckle are bent and connected, the front end knuckle is connected to the main claw body through the elastic member, and the terminal knuckle is movably arranged on one side of the bayonet.

3. The claw according to claim 2, characterized in that: A side surface of the terminal knuckle facing the bayonet is formed as a guide surface, and the guide surface is configured to contact the peripheral wall of the knife handle to guide the knife handle into the bayonet.

4. The claw according to claim 2, characterized in that: The inner wall of the bayonet is provided with a first protrusion, and the side of the terminal finger joint facing the bayonet is provided with a second protrusion; When the clamping claw clamps the tool handle, the first protrusion and the second protrusion are configured to be respectively clamped in the clamping grooves of the peripheral wall of the tool handle to limit the clamping position of the tool in the vertical direction.

5. The claw according to claim 2, characterized in that: The inner wall of the bayonet is provided with a positioning protrusion. When the clamping claw clamps the tool handle, the positioning protrusion is configured to be clamped in the positioning groove of the peripheral wall of the tool handle to limit the clamping posture of the tool along the circumferential direction.

6. The claw according to any one of claims 1 to 5, characterized in that: The main claw body is provided with a limiting shaft, the clamping finger is provided with a limiting hole, and the limiting shaft is passed through the limiting hole; Wherein, the limiting shaft and the limiting hole cooperate with each other to limit the rotation angle of the clamping finger relative to the main claw body.

7. The claw according to claim 6, characterized in that: The clamping finger is rotatably arranged on the side of the main claw body around a first axis, and the limiting hole is extended along the circumference of the first axis.

8. A double-layer double-station chain tool magazine, characterized in that: include: A first chain tool magazine and a second chain tool magazine, wherein the second chain tool magazine is stacked on an upper side of the first chain tool magazine; The first chain tool magazine and the second chain tool magazine have the same structure, both comprising a base, a driving mechanism, a conveying chain and a claw assembly; the conveying chain and the driving mechanism are respectively arranged on the base, and the driving mechanism is connected to the conveying chain to drive the conveying chain to move relative to the base; the claw assembly is provided with a plurality of sets, and the plurality of sets of the claw assemblies are sequentially arranged along the extending direction of the conveying chain; Wherein, each set of the clamping jaw assembly comprises two clamping jaws as described in any one of claims 1 to 7 which are arranged facing each other, and the two clamping jaws are used to simultaneously change tools for two spindles of a dual-spindle machining center.

9. The double-layer double-station chain tool magazine according to claim 8, characterized in that: The first end of the first chain tool magazine and the first end of the second chain tool magazine are both arranged toward the tool changing station; The distance between the first end of the second chain tool magazine and the tool changing station is greater than the distance between the first end of the first chain tool magazine and the tool changing station.

10. A dual-spindle machining center, characterized in that: include: A machine tool and a double-layer double-station chain tool magazine as described in claim 8 or 9, wherein the first chain tool magazine and the second chain tool magazine are respectively arranged on the rear side of the machine tool and are symmetrically arranged relative to the axial symmetry plane of the machine tool.

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