A vacuum device applicable to a numerically controlled lathe

Abstract

The present invention provides a vacuum device applicable to a numerically controlled lathe. The vacuum device is used for fixing a workpiece to be machined. The vacuum device includes an oil seal unit, a connection unit, and an adsorption unit. By connecting the oil seal unit to one end of the connection unit, it is convenient to form an oil seal between the connection unit and the oil seal unit through the oil seal unit, ensuring the sealing effect inside the device and improving the lubrication effect between the connection unit and the oil seal unit at the same time. By connecting the adsorption unit to the other end of the connection unit, it is convenient to evacuate air outward through the connection unit to make the adsorption unit adsorb the workpiece to be machined, ensuring the surface quality of the product, having strong versatility, and being simple to use and operate.

Description

Technical Field

[0001] The present invention relates to the technical field of precision machining, and particularly to a vacuum device applicable to a numerically controlled lathe. Background Art

[0002] Currently, with the continuous emergence of new technologies and new materials, the processing of products is becoming more and more inclined to high precision and good surface finish. Excellent products are an important guarantee for enterprises to improve the added value and competitiveness of products.

[0003] The semiconductor industry has very high requirements for the surface quality of mechanical parts. There should be no clamping scars on the part surface. At the same time, the machine tool should have a high rotational speed during processing to ensure the roughness requirements of the part surface. During conventional turning processing, locking devices such as three-jaw chucks, clamping plates, and screws are usually used to clamp the parts, which will more or less have a certain impact on the part surface. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcoming in the prior art that conventional turning processing cannot meet the requirements of the surface quality of parts, and to propose a vacuum device applicable to a numerically controlled lathe.

[0005] To achieve the above purpose, the present invention adopts the following technical solution: A vacuum device applicable to a numerically controlled lathe, which is used to fix a workpiece to be processed. The vacuum device includes an oil seal unit, a connection unit, and an adsorption unit. One end of the connection unit is connected to the oil seal unit, and the other end of the connection unit is connected to the adsorption unit. A vacuum seal is formed between the connection unit and the oil seal unit through the oil seal unit. The end of the connection unit connected to the oil seal unit evacuates air outward to enable the adsorption unit to adsorb the workpiece to be processed.

[0006] Preferably, the connection unit includes a transmission shaft. A suction hole is provided in the middle of the transmission shaft, and the suction hole penetrates the transmission shaft. The transmission shaft includes a first part, an intermediate part, and a second part. The first part is connected to the oil seal unit, the second part is connected to the adsorption unit, and the intermediate part is located between the oil seal unit and the adsorption unit.

[0007] Further, the oil seal unit includes an oil seal, a first bearing, and a second bearing. A first accommodation groove, a first connection hole, and a second accommodation groove are sequentially provided in the middle of the oil seal from the end far away from the adsorption unit to the end close to the adsorption unit. The first accommodation groove, the first connection hole, and the second accommodation groove are coaxially arranged and are sequentially communicated. The first bearing is arranged in the first accommodation groove, and the second bearing is arranged in the second accommodation groove. The first part passes through the second bearing, the first connection hole, and the first bearing in sequence and is rotatably fixed in the oil seal. An oil storage groove and a spiral groove are provided on the inner wall of the first connection hole. The spiral groove is located on the side of the oil storage groove close to the first accommodation groove. The oil storage groove and the spiral groove are communicated. An oil injection port is provided at a position on the side wall of the oil seal corresponding to the oil storage groove. The oil injection port is communicated with the oil storage groove, and a sealing member is provided at the oil injection port.

[0008] Still further, the oil seal unit further includes an end cover. The end cover is connected to the end of the oil seal far away from the adsorption unit. An air extraction port is provided in the middle of the end cover. The air extraction port is communicated with the air extraction hole. A temperature sensor is provided on the outer side wall of the oil seal.

[0009] Further, the adsorption unit includes an adsorbent. The adsorbent includes a connection part and an adsorption part. The connection part and the adsorption part are connected. A connection groove is provided in the middle of the connection part. Fixing holes are provided on the side wall of the connection part. The fixing holes are communicated with the connection groove. Screws are provided in the fixing holes. Fixing grooves are provided at positions on the side wall of the second part corresponding to the fixing holes close to the fixing holes. The screws pass through the fixing holes and are inserted into the fixing grooves to fixedly connect the second part with the adsorbent. A first air extraction port is provided in the middle of the adsorption part. The first air extraction port is communicated with the connection groove. The adsorption part further includes a second air extraction port. One end of the second air extraction port is provided on the end face of the adsorption part far away from the connection part. The other end of the second air extraction port is communicated with the first air extraction port.

[0010] Still further, a first adsorption groove is provided in the middle of the end face of the adsorption part far away from the connection part. The first adsorption groove is communicated with the first air extraction port. A second adsorption groove is provided on the outer periphery of the end face of the adsorption part far away from the connection part. The second adsorption groove is communicated with the second air extraction port. The adsorption unit further includes a cover. The cover is connected to the adsorbent. A first through hole is provided in the middle of the cover. The second part passes through the first through hole and is fixedly connected with the adsorbent.

[0011] Still further, the second adsorption groove is formed by connecting a plurality of sub-adsorption grooves evenly distributed along the outer periphery of the end face of the adsorption part far away from the connection part end to end.

[0012] Further, the connection unit further includes a guide sleeve. The guide sleeve is coaxially sleeved on the middle part with the transmission shaft.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: By connecting an oil seal unit to one end of the connection unit, it is convenient to form an oil seal between the connection unit and the oil seal unit through the oil seal unit, ensuring the sealing effect inside the device and improving the lubrication effect between the connection unit and the oil seal unit; By connecting an adsorption unit to the other end of the connection unit, it is convenient to evacuate air through the connection unit to make the adsorption unit adsorb the workpiece to be processed, ensuring the surface quality of the product, with strong versatility and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 FIG. is a schematic structural diagram of a vacuum device applicable to a numerically controlled lathe according to an embodiment of the present invention.

[0015] Figure 2 is Figure 1 right view structural diagram of.

[0016] Figure 3 is Figure 2 cross-sectional structural diagram along the A-A direction.

[0017] Figure 4 is Figure 3 enlarged structural diagram at A in.

[0018] Figure 5 is Figure 3 enlarged structural diagram at B in.

[0019] Figure 6 FIG. is a schematic structural diagram of a transmission shaft according to an embodiment of the present invention.

[0020] Figure 7 FIG. is a schematic structural diagram of an oil seal part according to an embodiment of the present invention.

[0021] Figure 8 FIG. is a schematic structural diagram of an adsorbing part according to an embodiment of the present invention.

[0022] Figure 9 FIG. is an application structural diagram of a vacuum device applicable to a numerically controlled lathe according to an embodiment of the present invention.

[0023] Figure 10 is Figure 9 cross-sectional structural diagram of. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To further understand the purpose, structure, features, and functions of the present invention, the following is a detailed description in conjunction with embodiments.

[0025] Please refer to Figures 1 to 3, A vacuum device applicable to a numerically controlled lathe according to the present invention is used to fix a workpiece to be machined. The vacuum device includes an oil seal unit 1, a connection unit 2, and an adsorption unit 3. One end of the connection unit 2 is connected to the oil seal unit 1, and the other end of the connection unit 2 is connected to the adsorption unit 3. A vacuum seal is formed between the connection unit 2 and the oil seal unit 1 through the oil seal unit 1. When the end of the connection unit 2 connected to the oil seal unit 1 evacuates air outward, the adsorption unit 3 adsorbs the workpiece to be machined.

[0026] By connecting the oil seal unit 1 to one end of the connection unit 2, it is convenient to form an oil seal between the connection unit 2 and the oil seal unit 1 through the oil seal unit 1, ensuring the sealing effect inside the device and improving the lubrication effect between the connection unit 2 and the oil seal unit 1 at the same time. By connecting the adsorption unit 3 to the other end of the connection unit 2, it is convenient to evacuate air outward through the connection unit 2 so that the adsorption unit 3 adsorbs the workpiece to be machined, ensuring the surface quality of the product, having strong versatility, and being simple to use and operate.

[0027] Please refer to Figure 1 , Figure 3 and Figure 6 , The connection unit 2 includes a transmission shaft 21. A vent hole 211 is provided in the middle of the transmission shaft 21, and the vent hole 211 penetrates the transmission shaft 21. The transmission shaft 21 includes a first part 212, a middle part 213, and a second part 214. The first part 212 is connected to the oil seal unit 1 to form an oil seal between the first part 212 and the oil seal unit 1. The second part 214 is connected to the adsorption unit 3, facilitating the adsorption of the workpiece to be machined by the adsorption unit 3 when air is evacuated outward through the vent hole 211 in the first part 212. The middle part 213 is located between the oil seal unit 1 and the adsorption unit 2.

[0028] In a preferred embodiment, the connection unit 2 further includes a guide sleeve 22. The guide sleeve 22 is coaxially sleeved on the middle part 213 with the transmission shaft 21 to prevent the transmission shaft 21 from generating excessive centrifugal force and fluttering under the condition of high rotational speed of the lathe. The guide sleeve 22 is preferably made of high molecular polyethylene material.

[0029] Please continue to refer to Figure 6 , The outer diameters of the first part 212 and the second part 214 are both smaller than the outer diameter of the middle part 213 to facilitate the connection of the transmission shaft 21 to the oil seal unit 1 and the adsorption unit 3.

[0030] Please refer to Figure 3 , Figure 4 and Figure 7, the oil seal unit 1 includes an oil seal 11, a first bearing 12 and a second bearing 13. In the middle of the oil seal 11, a first accommodation groove 111, a first connection hole 112 and a second accommodation groove 113 are successively provided from the end far away from the adsorption unit 3 to the end close to the adsorption unit 3. The first accommodation groove 111, the first connection hole 112 and the second accommodation groove 113 are coaxially arranged and are successively communicated with each other. The first bearing 12 is arranged in the first accommodation groove 111, and the second bearing 13 is arranged in the second accommodation groove 113. The first part 212 passes through the second bearing 13, the first connection hole 112 and the first bearing 12 in sequence and is rotatably fixed in the oil seal 11. An oil storage groove 1121 and a spiral groove 1122 are provided on the inner wall of the first connection hole 112. The oil storage groove 1121 and the spiral groove 1122 are communicated with each other. An oil injection port 114 is provided at a position on the side wall of the oil seal 11 corresponding to the oil storage groove 1121. The oil injection port 114 is communicated with the oil storage groove 1121, and a sealing member 115 is provided at the oil injection port 114.

[0031] After replenishing and injecting grease into the oil storage groove 1121 through the oil injection port 114, the oil injection port 114 is sealed with the sealing member 115. When the first part 212 evacuates air outward through the air extraction hole 211, the grease in the oil storage groove 1121 slowly slides into the spiral groove 1122 to form a vacuum seal. The spiral groove 1122 can reduce the rapid loss of grease and can solve the problem of insufficient lubrication at the same time, improving the lubrication effect.

[0032] In actual use, the spiral groove 1122 is at least provided on the side of the oil storage groove 1121 close to the first accommodation groove 111 so that the grease can diffuse along the spiral groove 1122 when evacuating air outward. As Figure 7 shown, the spiral groove 1122 is provided on both sides of the oil storage groove 1121 to make the lubricable area of the grease as large as possible. The rotation direction of the spiral groove is the same as the rotation direction of the lathe spindle.

[0033] To prevent high temperature and damage caused by excessive friction due to lack of grease, a temperature sensor 4 is provided on the outer side wall of the oil seal 11. The temperature sensor 4 can monitor the temperature of the oil seal 11 and remind the staff to replenish grease when the temperature is high.

[0034] Please continue to refer to Figure 4 , the oil seal unit 1 further includes an end cover 14. The end cover 14 is connected to the end of the oil seal 11 far away from the adsorption unit 3 to fix the first bearing 12 and ensure the sealing effect of the oil seal unit 1. An air extraction port 141 is provided in the middle of the end cover 14. The air extraction port 141 is communicated with the air extraction hole 211 to facilitate air extraction outward.

[0035] Preferably, a sealing ring 15 is provided between the end cap 14 and the oil seal 11 to further ensure the sealing effect of the oil seal unit 1.

[0036] The oil seal unit 1 further includes a tail cap 16. The tail cap 16 is connected to one end of the oil seal 11 close to the adsorption unit 3 to fix the second bearing 13 and ensure the sealing effect of the oil seal unit 1. A through hole is provided in the middle of the tail cap 16. The first part 212 can be rotatably fixed in the oil seal 11 after passing through the through hole, the second bearing 13, the first connection hole 112, and the first bearing 12 in sequence.

[0037] Please refer to Figure 3 , Figure 5 , Figure 6 and Figure 8 , the adsorption unit 3 includes an adsorbent 31. The adsorbent 31 includes a connecting part 311 and an adsorption part 312, and the connecting part 311 and the adsorption part 312 are connected.

[0038] A connecting groove 3111 is provided in the middle of the connecting part 311. Fixing holes 3112 are provided on the side wall of the connecting part 311. The fixing holes 3112 communicate with the connecting groove 3111. Screws 3113 are provided in the fixing holes 3112. Fixing grooves 2141 are provided at positions corresponding to the fixing holes 3112 on the side wall of the second part 214 close to the fixing holes 3112. After the screws 3113 pass through the fixing holes 3112, they are inserted into the fixing grooves 2141 to fixedly connect the second part 214 and the adsorbent 31, so that the adsorbent 31 and the transmission shaft 21 are linked.

[0039] To ensure the sealing effect, the screws 3113 are sealed with sealant.

[0040] A first air extraction port 3121 is provided in the middle of the adsorption part 312. The first air extraction port 3121 communicates with the connecting groove 3111. The adsorption part 312 further has a second air extraction port 3122. One end of the second air extraction port 3122 is provided on the end face of the adsorption part 312 away from the connecting part 311, and the other end of the second air extraction port 3122 communicates with the first air extraction port 3121.

[0041] When the first part 212 extracts air outward through the air extraction hole 211, the gas between the adsorption part 312 and the workpiece to be processed is extracted through the first air extraction port 3121, the second air extraction port 3122, the connecting groove 3111, and the air extraction hole 211, so that a vacuum adsorption is formed between the adsorption part 312 and the workpiece to be processed, avoiding the influence of clamping on the surface of the workpiece to be processed and ensuring the surface quality of the product.

[0042] To increase the adsorption area between the adsorbent 31 and the workpiece to be processed and ensure the adsorption effect, please continue to refer to Figure 8, a first adsorption groove 3123 is provided in the middle of the end face of the adsorption part 312 away from the connection part 311. The first adsorption groove 3123 is communicated with the first air extraction port 3121. A second adsorption groove 3124 is provided on the outer periphery of the end face of the adsorption part 312 away from the connection part 311. The second adsorption groove 3124 is communicated with the second air extraction port 3122.

[0043] Preferably, the second adsorption groove 3124 is composed of a plurality of sub-adsorption grooves 31241 evenly distributed along the outer periphery of the end face of the adsorption part 312 away from the connection part 311 and connected end to end, so as to make the adsorption area as large as possible, thereby ensuring the adsorption effect.

[0044] Please continue to refer to Figure 5 , the adsorption unit 3 further includes a cover 32. The cover 32 is connected to the adsorbent 31 to ensure the sealing effect of the adsorption unit 3. A first through hole 33 is provided in the middle of the cover 32. The second part 214 passes through the first through hole 33 and is fixedly connected to the adsorbent 31.

[0045] Please refer to in combination with Figure 9 and Figure 10 , Figure 9 is a schematic application structure diagram of a vacuum device applicable to a numerical control lathe according to an embodiment of the present invention, Figure 10 is Figure 9 The sectional structure diagram of. The adsorbent 31 of the adsorption unit 3 of the vacuum device is clamped between the three-jaw chucks 100 of the numerical control lathe. The middle part 213 and the guide sleeve 22 are arranged in the shaft platform 110, and the oil seal unit 1 is arranged outside the shaft platform 110 for convenient air extraction operation.

[0046] First, after the air extraction port 141 is connected to the vacuum pump, air extraction starts. The grease in the oil storage tank 1121 slowly slides into the spiral groove to form a vacuum seal. The gas between the adsorbent 31 and the workpiece to be processed is drawn away through the first air extraction port, the second air extraction port, the connection groove, and the air extraction hole 211, so as to form a vacuum adsorption between the adsorbent 31 and the workpiece to be processed, avoiding the influence of clamping on the surface of the workpiece to be processed.

[0047] During the processing, the air extraction port 141 is continuously connected to the vacuum pump for air extraction. The adsorbent 31 always adsorbs the workpiece to be processed. The three-jaw chuck 100 rotates to drive the adsorbent 31 to rotate. The adsorbent 31 drives the transmission shaft 21 to rotate. The grease in the spiral groove can ensure the lubrication effect of the transmission shaft 21. The temperature sensor 4 monitors the temperature of the oil seal part. When the temperature is relatively high, it reminds the staff to replenish the grease, thereby avoiding friction damage of the transmission shaft 21.

[0048] After the processing is completed, the three-jaw chuck 100 stops rotating, the air extraction port 141 no longer performs air extraction, the adsorbent 31 no longer adsorbs the workpiece, and the workpiece can be taken off.

[0049] A vacuum device applicable to a numerical control lathe according to the present invention is provided with an oil seal unit connected to one end of a connection unit, facilitating the formation of an oil seal between the connection unit and the oil seal unit through the oil seal unit, ensuring the sealing effect inside the device and improving the lubrication effect between the connection unit and the oil seal unit; an adsorption unit is connected to the other end of the connection unit, facilitating the adsorption of a workpiece to be processed by the adsorption unit through the connection unit exhausting air outward, ensuring the surface quality of the product, having strong versatility and simple operation.

[0050] The present invention has been described by the above related embodiments. However, the above embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention fall within the scope of patent protection of the present invention.

Claims

1. A vacuum device applicable to a numerically controlled lathe, used for fixing a workpiece to be machined, characterized in that, The vacuum device includes an oil seal unit, a connection unit, and an adsorption unit. One end of the connection unit is connected to the oil seal unit, and the other end of the connection unit is connected to the adsorption unit. A vacuum seal is formed between the connection unit and the oil seal unit through the oil seal unit. The end of the connection unit connected to the oil seal unit evacuates air outward to enable the adsorption unit to adsorb the workpiece to be processed; The connection unit includes a transmission shaft. A gas extraction hole is provided in the middle of the transmission shaft, and the gas extraction hole penetrates the transmission shaft. The transmission shaft includes a first part, a middle part, and a second part. The first part is connected to the oil seal unit, the second part is connected to the adsorption unit, and the middle part is located between the oil seal unit and the adsorption unit; The oil seal unit includes an oil seal member, a first bearing, and a second bearing. A first accommodation groove, a first connection hole, and a second accommodation groove are sequentially provided in the middle of the oil seal member from the end far from the adsorption unit to the end close to the adsorption unit. The first accommodation groove, the first connection hole, and the second accommodation groove are coaxially arranged and are sequentially communicated. The first bearing is arranged in the first accommodation groove, and the second bearing is arranged in the second accommodation groove. The first part passes through the second bearing, the first connection hole, and the first bearing in sequence and is rotatably fixed in the oil seal member. An oil storage groove and a spiral groove are provided on the inner wall of the first connection hole. The spiral groove is located on the side of the oil storage groove close to the first accommodation groove. The oil storage groove and the spiral groove are communicated. An oil injection port is provided at a position on the side wall of the oil seal member corresponding to the oil storage groove, and the oil injection port is communicated with the oil storage groove. A sealing member is provided at the oil injection port; The adsorption unit includes an adsorption member. The adsorption member includes a connection part and an adsorption part. The connection part and the adsorption part are connected. A connection groove is provided in the middle of the connection part, and a fixing hole is provided on the side wall of the connection part. The fixing hole is communicated with the connection groove. A screw is provided in the fixing hole. A fixing groove is provided at a position on the side wall of the second part close to the fixing hole corresponding to the fixing hole. The screw passes through the fixing hole and is inserted into the fixing groove to fixedly connect the second part and the adsorption member. A first air extraction port is provided in the middle of the adsorption part, and the first air extraction port is communicated with the connection groove. The adsorption part further includes a second air extraction port. One end of the second air extraction port is provided on the end face of the adsorption part far from the connection part, and the other end of the second air extraction port is communicated with the first air extraction port.

2. The vacuum device applicable to a numerically controlled lathe according to claim 1, characterized in that, The oil seal unit further includes an end cover. The end cover is connected to the end of the oil seal member far from the adsorption unit. An air extraction port is provided in the middle of the end cover, and the air extraction port is communicated with the gas extraction hole.

3. The vacuum device applicable to a numerically controlled lathe according to claim 1, characterized in that, A temperature sensor is provided on the outer side wall of the oil seal member.

4. The vacuum device applicable to a numerically controlled lathe according to claim 1, characterized in that, In the middle of the end face of the adsorption part far from the connection part, a first adsorption groove is provided, and the first adsorption groove is communicated with the first air extraction port. On the outer periphery of the end face of the adsorption part far from the connection part, a second adsorption groove is provided, and the second adsorption groove is communicated with the second air extraction port.

5. The vacuum device applicable to a numerically controlled lathe according to claim 4, characterized in that, The second adsorption groove is composed of a plurality of sub-adsorption grooves uniformly distributed along the outer periphery of the end face of the adsorption part far from the connection part and connected end to end.

6. The vacuum device applicable to a numerically controlled lathe according to claim 1, characterized in that, The adsorption unit further includes a cover, the cover is connected to the adsorbent, a first through hole is provided in the middle of the cover, and the second part is fixedly connected to the adsorbent after passing through the first through hole.

7. The vacuum device applicable to a numerically controlled lathe according to claim 1, characterized in that, The connection unit further includes a guide sleeve, and the guide sleeve is coaxially sleeved on the middle part together with the transmission shaft.

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