Electric spindle using electric tool changing mechanism

Abstract

The utility model discloses an electric spindle using an electric tool changing mechanism. Wherein the tool changing mechanism is installed behind the motorized spindle, a screw push rod in the tool changing mechanism directly faces a tool pull rod in the motorized spindle, a brushless motor shaft of a brushless motor is connected with a screw connecting nut through a reduction gear set to transmit torque, the screw connecting nut is in threaded connection with the screw push rod, and the screw push rod directly faces the tool pull rod in front. According to the electric spindle tool changing device, tool changing operation is conducted on the electric spindle in an electric mode, the occupied space is reduced, and therefore the space utilization efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of numerical control machine tools, and specifically relates to an electric spindle using an electric tool changing mechanism. Background Art

[0002] At present, the electric spindles on the market mainly use an air compressor to compress air to supply the spindle cylinder to work, so as to achieve the purpose of changing tools. When using the spindle, a compressor needs to be equipped. The compression pump has a large noise, is unsafe, consumes a large amount of electricity, thus increasing the use cost. In addition, there is an external air pipe for ventilation. If the equipment needs to be moved, an additional cylinder needs to be arranged, which is very troublesome. Content of the Utility Model

[0003] Aiming at the problems existing in the background art, the utility model provides an electric spindle using an electric tool changing mechanism, which can realize the tool changing function in an electric way, is convenient, simple, fast and convenient to use, has low requirements for the use environment, and can meet the need of moving the equipment to different sites at any time. The technical solution includes: an electric spindle, a tool changing mechanism and a brushless motor. The tool changing mechanism is installed behind the electric spindle, the screw push rod in the tool changing mechanism is directly opposite to the tool pull rod in the electric spindle, and the brushless motor shaft of the brushless motor is connected with the screw connecting nut through a reduction gear set to transmit torque. The screw connecting nut is threadedly connected with the screw push rod, and the screw push rod is directly opposite to the tool pull rod in the front.

[0004] The way that the brushless motor shaft is connected with the screw connecting nut through the reduction gear set is: the brushless motor shaft is fixed with a large gear, the large gear meshes with a small gear, and the small gear is fixed with the screw connecting nut.

[0005] The tool changing mechanism includes: a screw push rod, a gear rear cover, a screw connecting nut, angular contact bearings, a front housing of the tool changing mechanism and a rear housing of the tool changing mechanism. The front housing of the tool changing mechanism is fixed behind the electric spindle, the rear housing of the tool changing mechanism is fixed with the front housing of the tool changing mechanism, and the rear housing of the tool changing mechanism is connected with the screw connecting nut through a pair of angular contact bearings.

[0006] A detachable gear rear cover is installed behind the rear housing of the tool changing mechanism.

[0007] The brushless motor is installed in a brushless motor seat, and the brushless motor seat is fixed with the rear housing of the tool changing mechanism.

[0008] The electric spindle includes: a coil, a rotor, a coil fixing seat, a hollow rotating shaft, a tool pull rod, a disc spring, a chuck, a tool and an electric spindle housing. The coil fixing seat is fixed in the electric spindle housing, the hollow rotating shaft is connected with the coil fixing seat through a bearing, the rotor is fixed on the outer side of the hollow rotating shaft, the coil is fixed in the coil fixing seat, and the positions of the rotor and the coil correspond;

[0009] The tool pull rod passes through the hollow rotating shaft. A chuck is fixedly installed at the front end of the tool pull rod. The root of the tool is clamped in the chuck. The outside of the chuck is installed in the conical structure at the front end of the hollow rotating shaft. A disc spring is installed at the rear end of the tool pull rod. The first end of the disc spring abuts against the locking nut installed on the hollow rotating shaft, and the second end of the disc spring abuts against the rear end of the tool pull rod.

[0010] A micro-motion guiding shaft of a micro-motion limit switch group is fixedly installed on the screw push rod. The micro-motion limit switch group includes: a first micro-motion limit switch, a second micro-motion limit switch and a micro-motion guiding shaft. Among them, the first micro-motion limit switch and the second micro-motion limit switch are fixed on the surface of the front housing of the tool changing mechanism. The first micro-motion limit switch and the second micro-motion limit switch are connected to the brushless motor. The first micro-motion switch transmission rod of the first micro-motion limit switch is located at the forward safety position of the micro-motion guiding shaft, and the second micro-motion switch transmission rod of the second micro-motion limit switch is located at the backward safety position of the micro-motion guiding shaft.

[0011] The micro-motion limit switch group further includes: a micro-motion deep groove ball bearing. The micro-motion deep groove ball bearing is installed in the middle of the micro-motion guiding shaft. The outside of the micro-motion deep groove ball bearing is in contact with the long inner wall of the strip-shaped hole. The strip-shaped hole is opened in the front housing and / or the rear housing of the tool changing mechanism.

[0012] The beneficial effects of the present utility model are as follows:

[0013] 1. The tool change operation of the motorized spindle is realized by an electric method, which reduces the occupied space and thus increases the space utilization efficiency.

[0014] 2. Protect the structural safety of the tool change operation in the front and rear directions, and at the same time prevent the motor from being burned out due to over-travel jamming. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of an embodiment of a motorized spindle using an electric tool change mechanism of the present utility model;

[0016] Figure 2 It is a bottom view schematic diagram of an embodiment of the present utility model;

[0017] Figure 3 It is Figure 2 A schematic cross-sectional view taken along the A-A section.

[0018] Wherein: 37 - large gear, 40 - small gear, 100 - electric spindle, 101 - coil, 102 - rotor, 103 - coil fixing seat, 104 - hollow rotating shaft, 105 - tool pull rod, 106 - disc spring, 107 - chuck, 108 - tool, 109 - electric spindle housing, 110 - locking nut, 200 - tool changing mechanism, 210 - front housing of tool changing mechanism, 211 - rear housing of tool changing mechanism, 232 - screw push rod, 235 - gear rear cover, 236 - brushless motor seat, 241 - screw connection nut, 242 - angular contact bearing, 249 - deep groove ball bearing for screw, 300 - brushless motor, 310 - brushless motor shaft, 400 - micro - motion limit switch group, 410 - first micro - motion limit switch, 411 - first micro - motion switch drive rod, 420 - second micro - motion limit switch, 421 - second micro - motion switch drive rod, 430 - strip - shaped hole, 445 - deep groove ball bearing for micro - motion, 446 - micro - motion guide shaft. Detailed implementation mode

[0019] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0020] As Figure 1 and Figure 2 shown in the embodiment of the present utility model, it includes: an electric spindle 100, a tool changing mechanism 200 and a brushless motor 300. The tool changing mechanism 200 is installed behind the electric spindle 100. The screw push rod 232 in the tool changing mechanism 200 is directly opposite to the tool pull rod 105 in the electric spindle 100. The brushless motor shaft 310 of the brushless motor 300 is connected to the screw connection nut 241 (screw seat) through a reduction gear set to transmit torque. A threaded hole meshing with the screw push rod 232 is provided at the center of the screw connection nut 241, so as to push the screw push rod 232 to move axially forward and backward when the screw connection nut 241 rotates; the screw push rod 232 is directly opposite to the tool pull rod 105 in the front, so as to change the relative position between the tool pull rod 105 and the hollow rotating shaft 104 when moving forward and backward;

[0021] The way that the brushless motor shaft 310 is connected to the screw connection nut 241 through a reduction gear set is: the brushless motor shaft 310 is fixed to the large gear 37, the large gear 37 meshes with the small gear 40, and the small gear 40 is in interference fit with the screw connection nut 241.

[0022] As Figure 2The shown electric spindle 100 includes: a coil 101, a rotor 102, a coil fixing seat 103, a hollow rotating shaft 104, a tool pull rod 105, a disc spring 106, a chuck 107, a tool 108, and an electric spindle housing 109. Among them, the coil fixing seat 103 is fixed in the electric spindle housing 109, the hollow rotating shaft 104 is connected to the coil fixing seat 103 through bearings, the rotor 102 is fixed on the outer side of the hollow rotating shaft 104, the coil 101 is fixed in the coil fixing seat 103, and the positions of the rotor 102 and the coil 101 correspond so that after being powered on, the tool pull rod 105 and the tool 108 are driven to rotate through the hollow rotating shaft 104;

[0023] The tool pull rod 105 passes through the hollow rotating shaft 104. A chuck 107 is fixedly installed at the front end of the tool pull rod 105. The root of the tool 108 is clamped in the chuck 107. The outer side of the chuck 107 is installed in the conical structure at the front end of the hollow rotating shaft 104. A disc spring 106 is installed at the rear end of the tool pull rod 105; the first end of the disc spring 106 abuts against a locking nut 110 installed on the hollow rotating shaft 104, and the second end of the disc spring 106 abuts against the rear end of the tool pull rod 105, so as to ensure that the chuck 107 is received in the front end of the hollow rotating shaft 104 during work. When changing the tool, the screw push rod 232 moves forward and pushes the tool pull rod 105 forward. The movement of the tool pull rod 105 relative to the hollow rotating shaft 104 causes the chuck 107 to leave the front end of the hollow rotating shaft 104 and open, and then the operation of replacing the tool 108 is carried out.

[0024] As Figure 2 The shown tool changing mechanism 200 includes: a screw push rod 232, a gear rear cover 235, a screw connection nut 241, angular contact bearings 242, a front housing 210 of the tool changing mechanism, and a rear housing 211 of the tool changing mechanism. Among them, the front housing 210 of the tool changing mechanism is fixed behind the electric spindle 100 (specifically, it is connected and fixed to the electric spindle housing 109 through bolts). The rear housing 211 of the tool changing mechanism is fixed to the front housing 210 of the tool changing mechanism. The rear housing 211 of the tool changing mechanism is connected to the screw connection nut 241 through a pair of angular contact bearings 242. A detachable gear rear cover 235 is installed behind the rear housing 211 of the tool changing mechanism to cover and protect the large gear 37 and the small gear 40; the brushless motor seat 236 is fixed to the rear housing 211 of the tool changing mechanism, and the brushless motor 300 is installed in the brushless motor seat 236.

[0025] In this embodiment, there is also a screw deep groove ball bearing 249 for enhancing stability. The screw deep groove ball bearing 249 with an interference fit with the rear housing 211 of the tool changing mechanism and the screw connection nut 241 on the inner and outer sides is arranged on the side close to the large gear 37.

[0026] As Figure 1 And Figure 3The shown micro-motion limit switch group 400 includes: a first micro-motion limit switch 410, a second micro-motion limit switch 420, a micro-motion deep groove ball bearing 445, and a micro-motion guide shaft 446. The first end of the micro-motion guide shaft 446 is fixed to the middle front part of the screw push rod 232. A micro-motion deep groove ball bearing 445 is installed in the middle of the micro-motion guide shaft 446. The outer side of the micro-motion deep groove ball bearing 445 contacts the long inner wall of the strip-shaped hole 430, and the strip-shaped hole is opened in the front housing 210 and / or the rear housing 211 of the tool changing mechanism. The first micro-motion limit switch 410 and the second micro-motion limit switch 420 are connected to the brushless motor 300;

[0027] The first micro-motion limit switch 410 and the second micro-motion limit switch 420 are fixed on the surface of the front housing 210 of the tool changing mechanism (on the other side of the brushless motor 300). The first micro-motion switch transmission rod 411 of the first micro-motion limit switch 410 is located at the forward safety position of the micro-motion guide shaft 446. The first micro-motion switch transmission rod 411 is triggered when the brushless motor 300 drives the screw push rod 232 to continue moving forward without stopping in time when advancing to the tool changing position. After the first micro-motion switch transmission rod 411 is triggered, the first micro-motion limit switch 410 sends a stop signal to the brushless motor 300 to stop its rotation; the second micro-motion switch transmission rod 421 of the second micro-motion limit switch 420 is located at the backward safety position of the micro-motion guide shaft 446. After the tool changing is completed, the second micro-motion switch transmission rod 421 is triggered when the brushless motor 300 drives the screw push rod 232 to continue moving backward without stopping in time after the working position. After the second micro-motion switch transmission rod 421 is triggered, the first micro-motion limit switch 410 sends a stop signal to the brushless motor 300 to stop its rotation, thereby protecting the structural safety of the tool changing operation in both the forward and backward directions and preventing the motor from being burned out due to over-travel jamming.

[0028] When the present utility model is working, a 24V low-voltage power supply supplies power to the brushless motor 300 for forward and reverse rotation, driving the reduction gear set (large gear 37 and small gear 40) to rotate. The reduction gear set drives the screw connecting nut 241 to rotate, thereby driving the screw push rod to move forward and backward; when changing the tool, the screw push rod advances, and the movement of the tool pull rod 105 relative to the hollow rotating shaft 104 causes the chuck 107 to leave the front end of the hollow rotating shaft 104 and open. Subsequently, the chuck 107 releases the tool, and the operation of replacing the tool 108 is performed; when preparing to enter the working position after the tool changing is completed, the brushless motor 300 rotates in reverse. The chuck 107 retracts into the front end of the hollow rotating shaft 104.

Claims

1. An electric spindle using an electric tool changing mechanism, characterized in that: include: An electric spindle (100), a tool changing mechanism (200) and a brushless motor (300), wherein the tool changing mechanism (200) is installed at the rear of the electric spindle (100), a screw push rod (232) in the tool changing mechanism (200) faces a tool pull rod (105) in the electric spindle (100), a brushless motor shaft (310) of the brushless motor (300) is connected to a screw connecting nut (241) through a reduction gear set to transmit torque, the screw connecting nut (241) is threadedly connected to the screw push rod (232), and the screw push rod (232) faces the tool pull rod (105) in front.

2. The electric spindle using an electric tool changing mechanism according to claim 1, characterized in that: The brushless motor shaft (310) is connected to the screw connecting nut (241) via a reduction gear set in the following manner: the brushless motor shaft (310) is fixed to the large gear (37), the large gear (37) is meshed with the small gear (40), and the small gear (40) is fixed to the screw connecting nut (241).

3. The electric spindle using an electric tool changing mechanism according to claim 1, characterized in that: The tool changing mechanism (200) comprises: a screw push rod (232), a gear rear cover (235), a screw connecting nut (241), an angular contact bearing (242), a tool changing mechanism front housing (210) and a tool changing mechanism rear housing (211), wherein the tool changing mechanism front housing (210) is fixed to the rear of the electric spindle (100), the tool changing mechanism rear housing (211) is fixed to the tool changing mechanism front housing (210), and the tool changing mechanism rear housing (211) is connected to the screw connecting nut (241) via a pair of angular contact bearings (242).

4. The electric spindle using an electric tool changing mechanism according to claim 3, characterized in that: A detachable gear rear cover (235) is installed at the rear of the tool changing mechanism rear housing (211).

5. The electric spindle using an electric tool changing mechanism according to claim 1, characterized in that: The brushless motor (300) is installed in a brushless motor seat (236), and the brushless motor seat (236) is fixed to the rear housing (211) of the tool changing mechanism.

6. The electric spindle using an electric tool changing mechanism according to claim 1, characterized in that: The electric spindle (100) comprises: a coil (101), a rotor (102), a coil fixing seat (103), a hollow rotating shaft (104), a tool pull rod (105), a disc spring (106), a chuck (107), a tool (108) and an electric spindle housing (109), wherein the coil fixing seat (103) is fixed in the electric spindle housing (109), the hollow rotating shaft (104) and the coil fixing seat (103) are connected via a bearing, the rotor (102) is fixed on the outside of the hollow rotating shaft (104), the coil (101) is fixed in the coil fixing seat (103), and the positions of the rotor (102) and the coil (101) correspond to each other; The tool pull rod (105) passes through the hollow rotating shaft (104), and a chuck (107) is fixedly installed at the front end of the tool pull rod (105). The root of the tool (108) is clamped in the chuck (107). The outer side of the chuck (107) is installed in the conical structure at the front end of the hollow rotating shaft (104). The rear end of the tool pull rod (105) is installed with a disc spring (106); the first end of the disc spring (106) supports the locking nut (110) installed on the hollow rotating shaft (104), and the second end of the disc spring (106) supports the rear end of the tool pull rod (105).

7. An electric spindle using an electric tool changing mechanism according to any one of claims 1 to 6, characterized in that: A micro motion guide shaft (446) of a micro motion limit switch group (400) is fixedly mounted on the screw push rod (232). The micro motion limit switch group (400) comprises: a first micro motion limit switch (410), a second micro motion limit switch (420) and a micro motion guide shaft (446). The first micro motion limit switch (410) and the second micro motion limit switch (420) are fixed on the surface of a front housing (210) of a tool changing mechanism. The first micro motion limit switch (410) and the second micro motion limit switch (420) are connected to a brushless motor (300). The first micro motion switch transmission rod (411) of the first micro motion limit switch (410) is located at a forward safety position of the micro motion guide shaft (446), and the second micro motion switch transmission rod (421) of the second micro motion limit switch (420) is located at a backward safety position of the micro motion guide shaft (446).

8. The electric spindle using an electric tool changing mechanism according to claim 7, characterized in that: The micro-motion limit switch group (400) further comprises: a micro-motion deep groove ball bearing (445), the micro-motion deep groove ball bearing (445) being mounted in the middle of the micro-motion guide shaft (446), the outer side of the micro-motion deep groove ball bearing (445) being in contact with the long inner wall of the strip-shaped hole (430), and the strip-shaped hole (430) being opened in the front housing (210) and / or the rear housing (211) of the tool changing mechanism.

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