CN114434324A - A grinding device with pressure feedback - Google Patents

Abstract

The invention belongs to the technical field of mechanical grinding, and particularly relates to a grinding device with pressure feedback, which comprises a spring shaft, a peripheral main shaft, a linear rotating bearing, a connecting piece, an elastic piece, a stress body and a pressure sensor, wherein the spring shaft is arranged on the periphery of the spring shaft; a channel is arranged in the peripheral main shaft, and the connecting piece, the elastic piece, the stress body and the pressure sensor are all positioned in the channel; the grinding head is connected with one end of the spring shaft, and the other end of the spring shaft extends into a channel of the peripheral main shaft to be connected with the elastic part; the linear rotating bearing is sleeved outside the spring shaft and is connected with the peripheral main shaft; the elastic piece is connected with one end of the stress body, and the other end of the stress body is connected with the pressure sensor; the spring shaft linearly moves along the direction of the peripheral main shaft through the elastic piece; the spring shaft is connected with the peripheral main shaft through a connecting piece and integrally rotates along with the peripheral main shaft through the connecting piece. The axial movement and the rotary movement of the spring shaft are kept independent, and the axial pressure of the grinding head can be accurately measured.

Description

A grinding device with pressure feedback

technical field

The invention belongs to the technical field of mechanical grinding, and in particular relates to a grinding device with pressure feedback.

Background technique

In the field of metal material grinding, especially in the field of CNC machining such as metal pipe chamfering, the grinding amount of the grinding head and the surface quality of the workpiece after grinding are all related to the contact pressure between the grinding head and the workpiece and the speed of the grinding head. Relatedly, the existing CNC system can precisely control the rotation speed of the grinding head, but cannot input the contact pressure between the grinding head and the workpiece into the CNC system as a real-time feedback quantity for control, so that the precise process cannot be achieved. grinding.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a grinding device with pressure feedback in order to solve the above problems.

To achieve the above technical purpose, the present invention adopts the following technical solutions:

A grinding device with pressure feedback includes a grinding head, a spring shaft, a peripheral main shaft, a linear rotary bearing, a connecting piece, an elastic piece, a force-bearing body and a pressure sensor; the peripheral main shaft is provided with a channel, the connecting piece, The elastic part, the force receiving body and the pressure sensor are all located in the channel; the grinding head is connected with one end of the spring shaft, and the other end of the spring shaft extends into the channel of the peripheral main shaft to connect with the elastic part; the linear rotary bearing is sleeved on the spring shaft The elastic member is connected to one end of the force-receiving body, and the other end of the force-receiving body is connected to the pressure sensor; both the force-receiving body and the pressure sensor are connected to the peripheral main shaft; the spring shaft passes the elastic member along the direction of the peripheral main shaft Linear motion; the spring shaft is connected with the peripheral main shaft through the connecting piece, and the spring shaft rotates integrally with the peripheral main shaft through the connecting piece.

Further, the connecting member is a key transmission member, and the key transmission member includes a first key groove disposed on the inner wall of the channel and a key disposed on the outer wall of the spring shaft, and the peripheral spindle drives the spring shaft to rotate through the matching of the key groove and the key.

Further, the outer wall of the spring shaft is provided with a second keyway for installing the key.

Further, the outer wall of the peripheral main shaft between the linear rotary bearing sleeve and the second keyway is provided with a first stepped structure, and the diameter of the peripheral main shaft at the first stepped structure is larger than the diameter of the peripheral main shaft in the linear rotary bearing.

Further, the elastic member includes a spring, one end of the spring is sleeved outside the spring shaft, and the other end is sleeved outside the force receiving body.

Further, the outer wall of the peripheral main shaft between the second key groove and one end of the spring is provided with a second stepped structure, and the diameter of the peripheral main shaft at the second stepped structure is larger than the diameter of the peripheral main shaft inside the spring.

Further, a ring of protrusions is provided on the outer wall of the force-bearing body, and the other end of the spring can abut against the protrusions.

Further, the end of the peripheral spindle is connected with the slip ring, and the signal wire and the power wire of the pressure sensor are connected to the connection terminal of the slip ring after passing through the through hole.

Further, the outer wall of the peripheral main shaft is provided with a third keyway connected with the external transmission mechanism.

Compared with the prior art, the beneficial technical effects of the present invention are:

(1) The present invention constitutes a linear elastic measurement system through a spring shaft, a linear rotary bearing, an elastic member, a force receiving body and a pressure sensor, which can accurately measure the axial pressure of the grinding head during the grinding process in real time. In addition, the peripheral main shaft drives the spring shaft to rotate through the connecting piece. Because of the function of the linear rotary bearing, the axial movement of the spring shaft under axial pressure can be kept independent of the rotational movement, which are two degrees of freedom that do not interfere with each other. form of movement. The overall structure of the device is very simple and compact, and can accurately measure the axial pressure of the grinding head in real time, which is very suitable for the application of numerical control equipment in the high-speed grinding process;

(2) The signal line and power line of the pressure sensor pass through the inner hole of the peripheral spindle to connect with the fixed position slip ring, so that the pressure signal can be transmitted to the corresponding controller.

Description of drawings

1 is a schematic diagram of the internal structure of this embodiment;

FIG. 2 is a schematic diagram of the external structure of this embodiment.

In the figure, 1 grinding head, 2 spring shaft, 3 end cover, 4 linear rotary bearing, 5 flat key, 6 spring, 7 force body, 8 pressure sensor, 9 peripheral spindle, 10 slip ring, 11 first keyway.

Detailed ways

The present invention will be further described below with reference to specific embodiments, but the protection scope of the present invention is not limited thereto.

As shown in Figures 1 and 2, a grinding device with pressure feedback in this embodiment includes a grinding head 1, a spring shaft 2, a peripheral main shaft 9, a linear rotary bearing 4, a connecting piece, an elastic piece, a receiving Force body 7 and pressure sensor 8 . The peripheral main shaft 9 is provided with a channel, and the connecting piece, the elastic piece, the force receiving body 7 and the pressure sensor 8 are all located in the channel. The grinding head 1 is connected with one end of the spring shaft 2, and the other end of the spring shaft 2 extends into the peripheral main shaft 9 and is connected with the elastic member. The linear rotation bearing 4 is sleeved outside the spring shaft 2 and is connected with the peripheral main shaft 9 . The elastic piece is connected to one end of the force-receiving body 7 , and the other end of the force-receiving body 7 is connected to the pressure sensor 8 . Both the force receiving body 7 and the pressure sensor 8 are connected to the peripheral main shaft 9 .

The spring shaft 2 moves linearly along the direction of the peripheral main shaft 9 through the elastic element. The spring shaft 2 is connected with the peripheral main shaft 9 through the connecting piece, and the spring shaft 2 integrally rotates with the peripheral main shaft 9 through the connecting piece. The grinding head 1 is fastened on the spring shaft 2 in the form of screw connection, and the linear rotary bearing 4 is fixed on the peripheral main shaft 9 in the form of bolt connection. The lower end of the pressure sensor 8 is fixed in the inner threaded hole in the peripheral main shaft 9 by means of threads. The force-receiving body 7 of the spring 6 is fastened on the upper end of the pressure sensor 8 by means of threads.

The pressure sensor 8 is used to measure the contact pressure between the grinding head 1 and the workpiece. External transmission mechanisms such as synchronous pulleys or gears can drive the peripheral main shaft 9 to rotate. When the peripheral main shaft 9 rotates, it drives the grinding head 1, the spring shaft 2, the linear rotary bearing 4, the connecting piece, the elastic piece, the force-bearing body 7 and the pressure sensor. 8 turn as a whole. During the rotation, when the contact pressure between the grinding head 1 and the workpiece changes, the peripheral spindle 9 can lengthen or shorten the length extending out of the channel. Therefore, in this embodiment, a linear elastic measurement system is constituted by the spring shaft 2, the linear rotary bearing 4, the elastic member, the force receiving body 7 and the pressure sensor 8, which can accurately measure in real time the amount of force that the grinding head 1 receives during the grinding process. Axial pressure. In addition, the peripheral main shaft 9 drives the spring shaft 2 to rotate through the connecting piece. Because of the action of the linear rotary bearing 4, the axial movement of the spring shaft 2 when subjected to the axial pressure can be kept independent of the rotational movement, and the two are independent of each other. The degree of freedom motion form of the interference. The overall structure of the device is very simple and compact, and can accurately measure the axial pressure of the grinding head 1 in real time, which is very suitable for the application of numerical control equipment in the high-speed grinding process.

The connecting member in this embodiment is a key transmission member. The key transmission member includes a first keyway 11 disposed on the inner wall of the channel and a key disposed on the outer wall of the spring shaft 2. The peripheral spindle 9 drives the spring shaft 2 to rotate through the matching of the keyway and the key. The first keyway 11 has a certain length, and the spring shaft 2 can perform axial movement under the support and constraint of the linear rotary bearing 4 . When the length is determined, the key will collide with the first keyway 11 of the peripheral spindle 9 . In order to facilitate the installation of a key matching the keyway, the outer wall of the spring shaft 2 is provided with a second keyway for installing the key. The key is a round head flat key 5. The key and the second keyway constitute a key transmission structure. A first keyway 11 of a certain length is opened in the through hole of the peripheral main shaft 9, and a second keyway is opened in the spring shaft 2, and the second keyway can be installed with a round head flat key 5. The key and the second keyway form a key transmission structure, and the peripheral main shaft 9 makes the spring shaft 2 rotate through the form of key transmission.

The outer wall of the peripheral main shaft 9 located between the linear rotary bearing 4 sleeve and the second keyway is provided with a first stepped structure. The front end of the spring shaft 2 cooperates with the linear rotary bearing 4, and the diameter of the first stepped structure at the rear end of the spring shaft 2 is larger than that of the front end and has steps. When the spring shaft 2 moves axially to the outside of the channel of the peripheral main shaft 9, the step at the first stepped structure of the spring shaft 2 will collide with the linear rotary bearing 4, thereby forming a constraint. The first stepped structure in this embodiment is two steps.

The elastic member includes a spring 6 , one end of the spring 6 is sleeved outside the spring shaft 2 , and the other end is sleeved outside the force receiving body 7 . The force-bearing body 7 is an elastic force-bearing body 7 . Specifically, the inner ring of the spring 6 is sleeved on the upper end stud portion of the force receiving body 7 , the lower end stud portion of the spring shaft 2 is inserted into the inner ring of the spring 6 , and the spring shaft 2 moves axially toward the interior of the peripheral main shaft 9 , acting directly on the force-receiving body 7 through the spring 6 .

The outer wall of the peripheral main shaft 9 located between the second keyway and one end of the spring 6 is provided with a second stepped structure. The diameter of the peripheral main shaft 9 at the second stepped structure is larger than the diameter of the peripheral main shaft 9 inside the spring 6. The steps at the stepped structure can abut against the spring 6 so as to install the fixed spring 6 . The outer wall of the force-receiving body 7 is provided with a circle of protrusions, and the other end of the spring 6 can abut against the protrusions, so as to install the fixed spring 6 . The second stepped structure in this embodiment is two steps.

The head end of the peripheral main shaft 9 is provided with an end cover 3 sleeved outside the shaft of the spring 6 . The end of the peripheral spindle 9 is connected to the slip ring 10 , and the signal wire and the power wire of the pressure sensor 8 are connected to the connection terminals of the slip ring 10 after passing through the through hole. The slip ring 10 is fixedly mounted on the rear end of the peripheral main shaft 9 .

The outer wall of the peripheral main shaft 9 is provided with a third keyway which is connected with the external transmission mechanism. An external transmission mechanism such as a synchronous pulley or a gear can make the peripheral main shaft 9 rotate through the key transmission provided in the third key groove.

The use principle of this embodiment is as follows: during the grinding process, the external transmission mechanism drives the peripheral main shaft 9 to rotate, and the peripheral main shaft 9 drives the spring shaft 2 and the grinding head 1 to rotate as a whole through the key transmission; during the rotation of the grinding head 1, When the contact pressure between the grinding head 1 and the workpiece changes, the spring shaft 2 and the grinding head 1 move along the axial direction of the spring shaft 2 as a whole, approaching or away from the channel inside the peripheral spindle 9; the pressure is transmitted to the force-bearing body through the spring 6 7. The pressure sensor 8 senses the pressure of the force-receiving body 7 and presents the pressure in numerical form.

To sum up, in this embodiment, the spring shaft 2, the linear rotary bearing 4, the spring 6, the elastic force-receiving body 7 and the pressure sensor 8 together form a linear elastic measuring system, which can accurately measure the grinding head 1 in real time. Axial pressure during cutting. The peripheral main shaft 9 drives the spring shaft 2 to rotate through the form of key transmission. Due to the support and restraint effect of the linear rotary bearing 4, the axial movement of the spring shaft 2 when subjected to axial pressure can remain independent from the rotational movement without interfering with each other. .

The embodiments of the present invention have been described in detail above. For those of ordinary skill in the art, based on the ideas provided by the present invention, there will be changes in the specific embodiments, and these changes should also be regarded as the protection scope of the present invention. .

Claims (9)

1. A grinding device with pressure feedback, comprising a grinding head, characterized in that: It also includes a spring shaft, a peripheral spindle, a linear rotary bearing, a connecting piece, an elastic piece, a force-bearing body and a pressure sensor; the outer spindle is provided with a channel, and the connecting piece, the elastic piece, the force-bearing body and the pressure sensor are all located in the channel; The cutting head is connected with one end of the spring shaft, and the other end of the spring shaft extends into the channel of the peripheral main shaft and is connected with the elastic member; the linear rotary bearing is sleeved outside the spring shaft and connected with the peripheral main shaft; the elastic member is connected to the force-bearing body. One end is connected, and the other end of the force-bearing body is connected with the pressure sensor; both the force-bearing body and the pressure sensor are connected with the peripheral spindle; The spring shaft moves linearly along the direction of the peripheral main shaft through the elastic member; the spring shaft is connected with the peripheral main shaft through the connecting member, and the spring shaft rotates integrally with the peripheral main shaft through the connecting member. 2. The grinding device with pressure feedback according to claim 1, characterized in that: the connecting piece is a key transmission piece, and the key transmission piece comprises a first keyway arranged on the inner wall of the channel and a key arranged on the outer wall of the spring shaft, and the peripheral The main shaft is matched with the key through the keyway to drive the spring shaft to rotate. 3 . The grinding device with pressure feedback according to claim 2 , wherein the outer wall of the spring shaft is provided with a second key groove for installing the key. 4 . 4. The grinding device with pressure feedback according to claim 3, wherein the outer wall of the peripheral main shaft between the linear rotary bearing sleeve and the second keyway is provided with a first stepped structure, and the first stepped structure is The diameter of the peripheral main shaft is larger than the diameter of the peripheral main shaft in the linear rotary bearing. 5 . The grinding device with pressure feedback according to claim 3 , wherein the elastic member comprises a spring, one end of the spring is sleeved outside the spring shaft, and the other end is sleeved outside the force receiving body. 6 . 6. The grinding device with pressure feedback according to claim 5, wherein the outer wall of the peripheral spindle between the second keyway and one end of the spring is provided with a second stepped structure, and the second stepped structure is provided with a second stepped structure. The peripheral spindle diameter is larger than the peripheral spindle diameter inside the spring. 7 . The grinding device with pressure feedback according to claim 5 , wherein a ring of protrusions is provided on the outer wall of the force-receiving body, and the other end of the spring can abut against the protrusions. 8 . 8. The grinding device with pressure feedback according to any one of claims 1-7, characterized in that: the end of the peripheral spindle is connected with the slip ring, and the signal line and the power line of the pressure sensor pass through the through hole with the slip ring. The terminals of the ring are connected. 9. The grinding device with pressure feedback according to any one of claims 1-7, wherein the outer wall of the peripheral main shaft is provided with a third keyway connected to the external transmission mechanism.

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