Chain type tool magazine of numerical control machining center

Abstract

The present application relates to the technical field of tool magazine, specifically chain tool magazine of numerical control machining center, including machine tool, manipulator, tool magazine shell, tool pocket, transmission chain and transmission gear, the machine tool is installed with manipulator, the opposite side of machine tool is provided with tool magazine shell, the transmission gear is rotatably installed in tool magazine shell, the transmission gear is provided with transmission chain, the transmission chain is provided with a plurality of tool pockets, the tool magazine shell is provided with tool taking point one and tool taking point two, the machine tool is installed with tool changing device that can take tool from tool taking point one and tool taking point two, the tool changing device includes slide rail fixedly installed on the machine tool, the slide rail is provided with sliding groove, the slide rail adopts lighter aluminum alloy material, one end of the slide rail is provided with fixed seat. The present application sets two tool taking points in the tool magazine to shorten the moving stroke of tool in the tool magazine, reduce the waiting time of main shaft during tool changing and finally achieve the purpose of improving tool changing efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tool magazines, in particular to a chain tool magazine of a numerical control machining center. BACKGROUND

[0002] In the automatic machining process, the chain tool magazine is a tool magazine form in the numerical control machine tool. In recent years, the development of the tool magazine has gone beyond its role as a tool machine accessory. The quality of its products is related to the overall performance of the tool machine. The chain tool magazine mainly consists of a worm gear reducer, a chain tool storage warehouse, a mechanical hand shuttle device, and a mechanical hand. The chain storage warehouse of the tool magazine is driven by a servo motor through a cylindrical worm reducer. The position ring is open-loop controlled. The tool holder of the storage warehouse decodes the tool number by an encoder. The precise positioning is completed by an analog electronic control circuit. Compared with the disc type tool magazine and the umbrella type tool magazine, the chain tool magazine has the advantage of large tool capacity.

[0003] Due to the different storage methods of the chain tool magazine and other tool magazines, for the chain tool magazine, the chain is both a bearing system and a transmission system. The tools used in processing are stored in the tool pockets on the chain. When the tool needs to be changed, the tool on the tool magazine needs to be moved from the storage position to the tool changing area through chain transmission. Then, the tool changing of the spindle is completed by cooperating with the mechanical hand moving together. The specific actions are as follows: the tool magazine rotates to call the tool, the mechanical hand shuttle device moves the mechanical hand to the tool taking position, the mechanical hand clamps the new tool and takes it down, the mechanical hand shuttle device moves the mechanical hand to the tool changing area, the spindle rotates, the mechanical hand exchanges the new and old tools, the mechanical hand shuttle device moves the mechanical hand to the tool placing position, and the mechanical hand returns the old tool. In this set of actions, when the position of the spindle is far away from the position of the stored tool on the tool magazine, for example, the chain tool magazine of the existing large machining center, the tool storage capacity of the tool magazine can reach 100 to 200 tools. If the tool called by the program is exactly at the farthest position from the spindle, the tool magazine usually needs to rotate for a long time to move the tool to the tool changing area. The time spent on the whole tool exchange is long, and the long tool moving distance leads to the inability to improve the tool changing efficiency of the chain tool magazine, which ultimately affects the machining efficiency.

[0004] Therefore, a chain tool magazine of a numerical control machining center is proposed. Two tool taking points are arranged in the middle position of the tool magazine. By changing the tool taking position, the tool moving distance in the tool magazine is shortened, and the waiting time of the spindle during tool changing is reduced to solve the problems in the background art. SUMMARY

[0005] The purpose of the present application is to provide a chain tool magazine of a numerical control machining center. By arranging two tool taking points in the tool magazine, the tool moving distance in the tool magazine is shortened, and the waiting time of the spindle during tool changing is reduced to solve the problems in the background art.

[0006] To achieve the above purpose, the present application provides the following technical solutions:

[0007] A chain tool magazine of a numerical control machining center, comprising a machine tool, a manipulator, a tool magazine shell, a tool sleeve, a transmission chain and a transmission gear, the machine tool is provided with the manipulator, the machine tool is provided with the tool magazine shell on the opposite side, the transmission gear is rotatably installed in the tool magazine shell, the transmission chain is provided on the transmission gear, a plurality of tool sleeves are provided on the transmission chain, the tool magazine shell is provided with a first tool taking point and a second tool taking point, the machine tool is provided with a tool changing device capable of clamping tools from the first tool taking point and the second tool taking point, the tool changing device is used for taking down tools on the tool magazine to exchange with old tools on the main shaft and putting the old tools back into the tool magazine.

[0008] Preferably, the tool changing device comprises a sliding rail fixedly installed on the machine tool, a sliding groove is formed in the sliding rail, the sliding rail is made of light aluminum alloy material, a fixed seat is arranged at one end of the sliding rail, and a motor is arranged at the other end of the sliding rail, the motor is a servo motor, a screw rod is rotatably installed in the fixed seat, and the other end of the screw rod is connected with the output end of the motor, a moving platform is movably installed on the screw rod, and the other end of the moving platform is slidably installed in the sliding groove, the moving platform is connected with the manipulator, two far-apart tool taking points are arranged on the transmission chain, the tool is moved to the nearest tool taking point, then the manipulator is quickly moved to the corresponding tool taking point for tool changing operation, the stroke of the transmission chain when moving the tool to the tool taking point is shortened, the tool is moved to the tool changing area in a shorter time, the tool changing efficiency of the manipulator is effectively improved, the tool changing efficiency of the manipulator is improved to meet and match faster and faster machine tools, a plurality of tool releasing devices are installed on the transmission chain, the tool releasing devices are used for moving the tools in the tool magazine to appropriate tool taking points, so that the adjacent tools are not affected when the manipulator changes tools.

[0009] Preferably, the tool releasing device comprises a shell installed on the transmission chain, a first air cylinder is fixedly installed in the shell, a tool sleeve is installed in the shell, the pushing-out end of the first air cylinder is connected with the tool sleeve, the tool sleeve is divided into an upper tool sleeve and a lower tool sleeve, a second air cylinder is installed in the upper tool sleeve, and the pushing-out end of the second air cylinder is connected with the lower tool sleeve, the first air cylinder fixedly installed in the shell and the second air cylinder fixedly installed in the upper tool sleeve cooperate with each other, when the program needs to change tools, the transmission chain moves the tools needed to be used to the first tool taking point or the second tool taking point, the first air cylinder pushes out the tool sleeve, after the tool sleeve is pushed out to the position, the second air cylinder pushes out the lower tool sleeve to the center of the tool magazine and separates the lower tool sleeve from the upper tool sleeve, at this time, the tool on the lower tool sleeve is not in the same plane with the adjacent tools on the tool magazine, the traditional chain tool magazine usually has only one tool taking point, and generally realizes the clamping of the tools of the manipulator by rotating or pushing out the tools outward, and the traditional method is only suitable for one tool taking point and the total tool changing stroke is too long, by pushing out the tools to be taken to the center of the tool magazine and placing the tools in different planes with the adjacent tools, the tool changing stroke is shortened, and the manipulator is prevented from hitting the adjacent tools when completing the clamping action to cause damage to the tools or equipment.

[0010] Preferably, a slot one accommodating the cylinder one is formed on both sides of the tool holder, the cylinder one is placed side by side with the tool holder, and the push-out end of the cylinder one is connected with the inner wall of the slot one, if the cylinder is placed behind the tool holder, the length of the equipment in the horizontal direction will be too long, which is not conducive to the placement of the equipment, by making the cylinder one closely adhere to both sides of the tool holder and connecting the push-out end of the cylinder one with the inner wall of the slot one, the cylinder one is placed side by side with the tool holder, which optimizes the spatial shape of the equipment while achieving the above functions, and makes the structure of the entire tool releasing device more compact and the space utilization more reasonable.

[0011] Preferably, a baffle is arranged on the upper end face of the tool holder, the baffle is located at the position corresponding to the tool handle gripped by the manipulator at the front end of the tool holder, in the tool changing process, the push-out action of the cylinder one will cause the tool to axially deviate due to inertia, which will cause the manipulator to fail to normally grasp the tool, and in severe cases, the tool may fall, by arranging the baffle on the upper end face of the tool holder, the tool will be firmly fixed in the correct position when the cylinder one pushes out the tool holder, which prevents the tool from axially deviating due to inertia, and avoids the tool from falling and hitting the tool and equipment below, which causes the tool to break and the equipment to be damaged.

[0012] Preferably, a reinforcing plate is mounted on both sides of the lower tool holder, and the reinforcing plate is movably mounted in the slot one, when the manipulator works for a long time, the tool clamping action will inevitably have errors, which will cause the push rod of the cylinder two to be damaged by the manipulator, the push rod will be deformed, and finally the cylinder two will be completely scrapped and cannot be used, by arranging the reinforcing plate, when the manipulator hits the tool, the force received by the tool will be transmitted to the push rod of the cylinder two and the reinforcing plate, and under the protection of the reinforcing plate, the push rod is prevented from being deformed due to receiving too much force.

[0013] Preferably, a slot two is formed on the upper end of the shell, a telescopic rod is rotatably mounted in the slot two, the other end of the telescopic rod is connected with the upper end face of the tool holder, and the telescopic rod is in contact with the bottom surface of the slot two, under the action of the cylinder one, the tool holder will be pushed out, at this time, the weight of the tool holder and the tool will completely fall on the push rod of the cylinder one, long-term use will cause the push rod to bend and finally cause the cylinder to fail to work normally, by arranging the telescopic rod to connect the tool holder with the shell, when the cylinder one pushes out the tool holder, the telescopic rod will take the edge of the shell as a fulcrum, and after being connected with the upper end face of the tool holder at the end through the principle of lever, the force received by the push rod of the cylinder one is shared, so that the push rod will not bend and deform after long-term use due to receiving too much gravity, and the service life of the equipment is prolonged.

[0014] Preferably, tool retrieval point one and tool retrieval point two are located at the upper and lower center of the tool magazine housing, respectively, and correspond to the position of the slide rail. By setting tool retrieval points at these two positions, the two tool retrieval points are located exactly in the center area of ​​the tool magazine. When the tool magazine needs to retrieve a tool, in traditional tool magazines, it is necessary to rotate the chain by 50% to move the farthest tool to the tool changing area. Now, this can be shortened from 50% to 25% of the chain length, significantly reducing the distance that the tool needs to move in the tool magazine. This makes the tool magazine retrieve tools faster and in less time. Furthermore, because the line connecting tool retrieval point one and tool retrieval point two is perpendicular to the ground and corresponds to the slide rail, the robotic arm only needs to perform vertical displacement when changing tools, effectively improving the tool changing efficiency of the equipment itself.

[0015] Preferably, a photoelectric sensor is installed on the motor, with the sensor's output end pointing towards the moving platform. A positioning hemisphere is located on the upper part of the moving platform. The positioning hemisphere works in conjunction with the photoelectric sensor. During prolonged use of the lead screw module, minor errors inevitably occur. In CNC machining, even minor errors can lead to significant losses, directly causing the robot arm to be unable to accurately pick up tools from the tool magazine. This can result in tool damage or even tool magazine failure, impacting production line efficiency. Therefore, by installing a photoelectric sensor on the motor, the robot arm's position is reset to zero every three hours. The distance between the reset moving platform and the sensor is measured using photoelectric ranging. The distance between the electrical sensors is finely adjusted through feedback data to compensate for the distance, thereby achieving the reset and correction of the moving platform and avoiding excessive errors between the moving platform and the lead screw after long-term operation. During the machining process, some iron filings or impurities inevitably splash and remain on the surface of the equipment. In order to prevent iron filings or impurities from accumulating on the upper part of the moving platform and causing the photoelectric sensor to fail to correct the moving platform properly, the measuring point on the moving platform is set in a hemispherical shape, and the emitting end of the photoelectric sensor points to the center of the sphere. By setting the measuring point in a hemispherical shape, iron filings or impurities are less likely to accumulate at the measuring point, and even if they fall on it, they will easily fall off due to the spherical surface.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. By setting tool retrieval points at the top and bottom of the tool magazine, these two points are positioned precisely in the center of the magazine. When the tool magazine needs to retrieve a tool, traditionally, moving the furthest tool to the tool changing area requires rotating the chain by 50% of its length. Now, this is reduced to 25%, significantly decreasing the distance the tool needs to move. This results in faster and shorter tool retrieval, effectively improving the tool changing efficiency of the equipment.

[0018] 2、If the cylinder is placed behind the tool holder, it will cause the length of the device in the horizontal direction to be too long, which is not conducive to the placement of the device. By making the cylinder one tightly attached to the two sides of the tool holder and connecting the push-out end of the cylinder one with the inner wall of the groove one, the cylinder one is placed side by side with the tool holder, which optimizes the spatial shape of the device while achieving the above functions, making the structure of the entire tool release device more compact and the space utilization more reasonable. By setting the baffle on the upper tool holder end face, the tool magazine will not cause the tool to fall out of the tool holder due to the shaking of the machine during operation, preventing the tool from falling and hitting the tool and equipment below, causing the tool to break and the equipment to be damaged.

[0019] 3、By setting the reinforcing plate, when the manipulator hits the tool, the force received by the tool will be transmitted to the push rod of cylinder two and the reinforcing plate, which avoids the push rod from being deformed due to bearing too much force under the protection of the reinforcing plate. By setting the telescopic rod to connect the tool holder with the shell, when cylinder one pushes out the tool holder, the telescopic rod will share the force received by the push rod of cylinder one, so that the push rod will not bend and deform after long-term use due to receiving too much gravity, prolonging the service life of the device. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the present application;

[0021] Figure 2 is a front view of the chain tool magazine in the present application;

[0022] Figure 3 is a position relationship diagram of the tool changing device in the present application;

[0023] Figure 4 is a front view of the tool changing device in the present application;

[0024] Figure 5 is Figure 4 is a sectional view at A-A in the present application;

[0025] Figure 6 is a structural schematic diagram of the tool release device in the present application;

[0026] Figure 7 is a structural schematic diagram of the tool release device after cylinder one is pushed out in the present application;

[0027] Figure 8 is a structural schematic diagram of the tool release device after being completely expanded in the present application;

[0028] Figure 9 is an exploded view of the tool release device in the present application;

[0029] Figure 10 is a position relationship diagram of the baffle in the present application.

[0030] In the figure: 1, machine tool; 2, mechanical hand; 3, tool magazine shell; 4, tool holder; 401, upper tool holder; 402, lower tool holder; 5, transmission chain; 6, transmission gear; 7, tool taking point 1; 8, tool taking point 2; 9, shell; 10, cylinder 1; 11, cylinder 2; 12, slide rail; 13, fixed seat; 14, motor; 15, screw; 16, moving platform; 17, groove 1; 18, baffle; 19, reinforcing plate; 20, groove 2; 21, telescopic rod; 22, sliding groove; 23, photoelectric sensor; 24, positioning hemisphere. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] Embodiment one, please refer to Figures 1 to 10 The present application provides a chain tool magazine of a numerical control machining center, which is used when the number of tools in the chain tool magazine is greater than 100, and the technical solution is as follows:

[0033] A numerical control machining center chain tool magazine, including machine tool 1, manipulator 2, tool magazine shell 3, tool pocket 4, transmission chain 5 and transmission gear 6, machine tool 1 is installed with manipulator 2, machine tool 1 opposite side is provided with tool magazine shell 3, tool magazine shell 3 is rotatably installed with transmission gear 6, transmission gear 6 is provided with transmission chain 5, transmission chain 5 is provided with a plurality of tool pockets 4, tool magazine shell 3 is provided with tool taking point one 7 and tool taking point two 8, transmission chain 5 is installed with 100 housings 9, 2 cylinders one 10 are fixedly installed in housing 9, tool pocket 4 is installed in housing 9, cylinder one 10 push-out end is connected with tool pocket 4, tool pocket 4 is divided into upper tool pocket 401 and lower tool pocket 402, 2 cylinders two 11 are installed in upper tool pocket 401, cylinder two 11 push-out end is connected with lower tool pocket 402, machine tool 1 is fixedly installed with slide rail 12, slide groove 22 is set up in slide rail 12, slide rail 12 adopts lighter aluminum alloy material, one end of slide rail 12 is provided with fixed seat 13, and the other end of slide rail 12 is provided with motor 14, motor 14 is servo motor 14, screw rod 15 is rotatably installed in fixed seat 13, and the other end of screw rod 15 is connected with motor 14 output end, movable platform 16 is movably installed on screw rod 15, and the other end of movable platform 16 is slidably installed in slide groove 22, movable platform 16 is connected with manipulator 2, groove one 17 accommodating cylinder one 10 is set up on both sides of tool pocket 4, cylinder one 10 is placed side by side with tool pocket 4, and cylinder one 10 push-out end is connected with groove one 17 inner wall, baffle 18 is set up on upper tool pocket 401 end face, baffle 18 is located at the front end of tool pocket 4, reinforcing plate 19 is installed on both sides of lower tool pocket 402, reinforcing plate 19 moves and slides in groove one 17 along with cylinder two 11, groove two 20 is set up on the upper end of housing 9, telescopic rod 21 is rotatably installed in groove two 20, the other end of telescopic rod 21 is connected with upper tool pocket 401 end face, tool taking point one 7 and tool taking point two 8 are located in the upper and lower of tool magazine shell 3 respectively, and correspond to the position of slide rail 12, photoelectric sensor 23 is installed on motor 14, and the emission end of photoelectric sensor 23 points to movable platform 16, positioning hemisphere 24 is set up on the upper end of movable platform 16, and positioning hemisphere 24 cooperates with photoelectric sensor 23.

[0034] Before starting formal work need to ensure that the photoelectric sensor 23 emission end accurately irradiated at the center of the hemisphere to avoid light refraction error, correction is completed take a tool installed in the chain tool magazine 4 in the tool pocket, after installation is complete set machine tool 1 simulation tool change, at this time the tool magazine starts to drive chain rotation and drive the chain on the tool movement, tool magazine will move to the tool point one 7 after the manipulator 2 in the lead screw 15 slide rail 12 driven fast moving to the tool point one 7 corresponding position, then the cylinder one 10 forward push tool pocket 4, completely push out after the second cylinder 11 in the upper tool pocket 401 will lower tool pocket 402 push away from the current chain horizontal plane, tool release device complete action after the manipulator 2 rotates the tool, after grabbing the tool to the tool outward pull tool pocket 4 and with slide rail 12 fast moving to the spindle tool change, at this time the manipulator 2 again rotates the tool to pull out the old tool from the spindle after rotating the manipulator 2 will install the new tool in the spindle, complete tool change after the manipulator 2 rotates and moves upward through the slide rail 12, the old tool is aligned with the tool pocket 4 of the tool point one 7 after the old tool is installed in the tool pocket 4, complete the tool after the second cylinder 11 reverse operation upwardly moving to combine the lower tool pocket 402 and the upper tool pocket 401, after the combination is completed, the first cylinder 10 is reversely operated to store the entire tool pocket 4 back into the shell 9 to complete the tool change action; After the trial operation is completed, the required tools of the production line can be installed in the tool magazine, after the installation of all tools is completed, the information of the tools in the tool pocket 4 in the tool magazine is input on the machine tool 1 equipment, after the input is completed, the normal work can be started, after starting, the manipulator 2 starts self-checking according to the distance measured by the photoelectric sensor 23, the manipulator 2 is driven by the lead screw 15 and the moving platform 16 to move to the zero position of the slide rail 12, then according to the program input by the operator, the tool magazine starts to rotate to move the corresponding tool to the nearest one of the tool point one 7 and the tool point two 8, and the manipulator 2 repeats the above tool change action to complete the tool change.

[0035] Embodiment two, please refer to Figures 1 to 10 The application provides a chain tool magazine of a numerical control machining center, which is used when the number of tools in the chain tool magazine is less than or equal to 100.

[0036] In the second embodiment, the number of tool pockets 4 in the chain tool magazine can be increased or decreased by disassembling and assembling the chain plates, and the number of tool pockets 4 determines the number of tools that can be stored in the tool magazine. When the number of tool pockets 4 used in the tool magazine is too small, frequent up and down movement of the robot 2 will slow down the tool changing time and reduce the work efficiency. When the number of tool pockets 4 in the tool magazine is equal to 100, if the method of placing the two tool taking points in the middle is used in the first embodiment, the chain tool magazine needs to call 25 tool pockets 4 that are farthest apart. Compared with the 50 tool pockets 4 that are away from only one tool taking point, the speed of driving 25 tool pockets 4 and the farthest distance that the robot 2 needs to move are compared. At this time, this structure does not have absolute efficiency advantage. Therefore, the position of the tool taking point 7 in the first embodiment can be abandoned, and only the tool taking point 8 close to the spindle is used to meet the processing requirements when the number of tool pockets 4 is less than 100. When the production line needs to increase the number of tools, the chain tool magazine can be used to increase the number of tool pockets 4 at will, and the processing method of placing two tool taking points in the middle can be restored to improve the tool changing efficiency and achieve the purpose of improving the production efficiency.

[0037] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A chain type tool magazine of a numerical control machining center, comprising a machine tool (1), a manipulator (2), a tool magazine shell (3), a tool holder (4), a transmission chain (5) and a transmission gear (6), the machine tool (1) is provided with the manipulator (2), the machine tool (1) is provided with the tool magazine shell (3) on the opposite side, the transmission gear (6) is rotatably installed in the tool magazine shell (3), the transmission chain (5) is arranged on the transmission gear (6), and a plurality of tool holders (4) are arranged on the transmission chain (5), characterized in that: The machine tool (1) is provided with a tool changing device capable of clamping tools from two tool taking points to reduce the moving stroke of the transmission chain (5), and the tool changing device is used for taking down tools on a tool magazine and exchanging the tools with old tools on a main shaft and putting the old tools back into the tool magazine. ​ 2. A chain tool magazine of a numerically controlled machining center according to claim 1, characterized in that: The tool changing device comprises a sliding rail (12) fixedly installed on the machine tool (1), a sliding groove (22) is formed in the sliding rail (12), a fixed seat (13) is arranged at one end of the sliding rail (12), and a motor (14) is arranged at the other end of the sliding rail (12), a lead screw (15) is rotatably installed in the fixed seat (13), and the other end of the lead screw (15) is connected with the output end of the motor (14), a moving platform (16) is movably installed on the lead screw (15), and the moving platform (16) is slidably installed in the sliding groove (22), the mechanical hand (2) is installed on the moving platform (16), and a plurality of tool releasing devices are installed on the transmission chain (5), the tool releasing devices are used for moving tools in the tool magazine to appropriate tool taking points, so that the tool changing of the mechanical hand (2) will not affect adjacent tools.

3. A chain tool magazine for a numerically controlled machining center according to claim 2, characterized in that: The tool releasing device comprises a shell (9) installed on the transmission chain (5), a first air cylinder (10) is fixedly installed in the shell (9), a tool sleeve (4) is installed in the shell (9), the pushing end of the first air cylinder (10) is connected with the tool sleeve (4), the tool sleeve (4) is divided into an upper tool sleeve (401) and a lower tool sleeve (402), a second air cylinder (11) is installed in the upper tool sleeve (401), and the pushing end of the second air cylinder (11) is connected with the lower tool sleeve (402).

4. A chain tool magazine for a numerically controlled machining center according to claim 3, characterized in that: Grooves (17) for accommodating the first air cylinder (10) are formed in the two sides of the tool sleeve (4), the first air cylinder (10) is arranged side by side with the tool sleeve (4), and the pushing end of the first air cylinder (10) is connected with the inner wall of the groove (17).

5. A chain tool magazine for a numerically controlled machining center according to claim 3, characterized in that: A baffle (18) is arranged on the end face of the upper tool sleeve (401), and the baffle (18) is located at a position corresponding to the front end of the tool sleeve (4) and the tool handle gripped by the mechanical hand (2).

6. A chain tool magazine for a numerically controlled machining center according to claim 3, characterized in that: Reinforcing plates (19) are installed on the two sides of the lower tool sleeve (402) and movably installed in the groove (17).

7. A chain tool magazine of a CNC machining center according to claim 3, characterized in that: A groove (20) is formed in the upper end of the shell (9), a telescopic rod (21) is rotatably installed in the groove (20), the other end of the telescopic rod (21) is connected with the end face of the upper tool sleeve (401), and the telescopic rod (21) is attached to the bottom face of the groove (20).

8. A chain tool magazine of a CNC machining center according to claim 2, characterized in that: The tool taking points comprise a first tool taking point (7) and a second tool taking point (8), the first tool taking point (7) and the second tool taking point (8) are respectively located above and below the middle of the tool magazine shell (3) and correspond to the positions of the sliding rail (12).

9. A chain tool storage magazine for a numerically controlled machining center according to claim 2, characterized in that: An optical sensor (23) is installed on the motor (14), and the emitting end of the optical sensor (23) is directed towards the moving platform (16).

10. A chain tool magazine for a numerically controlled machining center according to claim 9, characterized in that: A positioning hemisphere (24) is arranged on the upper end of the moving platform (16), and the positioning hemisphere (24) cooperates with the optical sensor (23).

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