WO2022166318A1

WO2022166318A1 - Device for switching and locking forward and reverse rotation functions of impact wrench by using one key

Info

Publication number: WO2022166318A1
Application number: PCT/CN2021/132265
Authority: WO
Inventors: 王祥录; 陈吉雄
Original assignee: 漳州南方机械有限公司
Priority date: 2021-01-19
Filing date: 2021-11-23
Publication date: 2022-08-11
Also published as: CN114193383A; CN112518650A

Abstract

Disclosed in the present invention is a device for switching and locking forward and reverse rotation states of an impact wrench by using one key, the device comprising a housing, an air cylinder, screws A, an air valve seat sealing ring, an air valve seat, a sealing ring A, a valve bolt, a guide wheel A, a guide wheel B, an E-shaped retaining ring, a solid pin, screws B, a baffle, a sealing ring B, a key, a reset spring and a screw C, wherein the housing is provided with a motor chamber, an air exhaust chamber and an air intake chamber; a sealing ring slot A is provided at an opening portion of the air intake chamber; and a screw hole B, a baffle mounting depressed platform, a sealing ring slot B, a through hole, a spring positioning depressed platform and a key mounting square hole are provided below the motor chamber of the housing. According to the device for switching and locking forward and reverse rotation functions of the impact wrench by using one key, the rotation-type and two-key-type switching modes of a traditional impact wrench are abandoned, and the forward and reverse rotations of the impact wrench are switched by using one key in a self-lockable state, thereby simplifying operations.

Description

A device that uses a button to switch and lock the forward and reverse functions of an air wrench

technical field

The invention relates to the technical field of pneumatic wrenches, in particular to a device which adopts a button to switch and lock the forward and reverse functions of the pneumatic wrench.

Background technique

The working principle of the pneumatic wrench is that the compressed air enters the cylinder through the air-closing mechanism, the speed regulating mechanism, and the forward and reverse mechanism, and pushes the blades to drive the rotor to rotate, so that the striking mechanism generates an instantaneous high-energy alternating impact load. Because of its large torque output, it is safe to use. It has good performance and is widely used in screw assembly and disassembly occasions such as assembly production lines and maintenance places. Screw assembly and disassembly are realized by switching the forward and reverse functions of the pneumatic wrench, so the switching operations of the forward and reverse functions of the pneumatic wrench are more frequent.

The forward and reverse switching of the traditional pneumatic wrench is generally divided into three categories: the first type is directly realized by the axial rotation of the regulating valve. When the pneumatic wrench is switched between the forward and reverse directions, the operator must operate it with both hands, that is, the operator holds the hand with one hand. Pneumatic wrench, rotate the knob of the regulating valve with the fingers of the other hand to realize the forward and reverse switching of the pneumatic wrench. The second type is directly realized by the axial linear movement of the regulating valve. There is always one end protruding from the pneumatic wrench housing at both ends of the pneumatic wrench regulating valve. The operator presses the protruding end to make the axial movement of the pneumatic wrench regulating valve to achieve positive and negative. Therefore, the forward and reverse switching function of this type of pneumatic wrench is a two-button type. These two buttons are located at the front and rear ends of the pneumatic wrench or on the left and right sides. After careful analysis, due to the structural limitations of such traditional pneumatic wrenches, adjusting The two ends of the valve are a certain distance from the hand grip, and the forward and reverse switching of the pneumatic wrench brings inconvenience to the operator. The third type is achieved by indirectly pushing the regulating valve to rotate axially by two side-by-side buttons at the rear end of the pneumatic wrench. The forward and reverse switching device of this type of pneumatic wrench uses two buttons, which is slightly redundant, and misoperation often occurs. To sum up, the traditional pneumatic wrench brings a lot of inconvenience to the operator when switching functions, especially when switching between forward and reverse.

Therefore, the switching of the forward and reverse functions of the traditional pneumatic wrench has the defects that it cannot be operated without changing the holding posture and that operators with different hand habits can all obtain the same operating feel.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a device for switching and locking the forward and reverse functions of a pneumatic wrench by using a button, so as to solve the problems raised in the above-mentioned background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: a device for switching and locking the forward and reverse states of a pneumatic wrench with a button comprises a casing, a cylinder, a screw A, a valve seat sealing ring, a gas valve seat, and a sealing ring A. , valve bolt, guide wheel A, guide wheel B, E-type retaining ring, solid pin, screw B, baffle, sealing ring B, button, return spring, screw C; the housing is provided with a motor chamber, an exhaust chamber , intake chamber, the mouth of the intake chamber is provided with a sealing ring groove A, the lower part of the housing motor chamber is provided with a screw hole B, a baffle mounting sink, a sealing ring slot B, a through hole, a spring positioning sink, and a button installation The cylinder is placed in the motor group, and the cylinder is provided with air groove A, air groove B, screw hole A, eccentric inner hole, exhaust hole, and arc grooves on both ends; the air valve seat is provided with a seal Ring groove C, air groove C, air groove D, air inlet hole, exhaust groove, air valve hole, screw through hole A, solid pin mounting hole, the air valve seat sealing ring is placed in the sealing ring groove C, the air valve seat Connect the cylinder with the screw A, so that the air groove C is always connected to the air groove A of the cylinder, the air groove D is always connected to the air groove B of the cylinder, and the air inlet hole is always connected to the air inlet chamber of the casing; the sealing ring A is placed in the casing In the groove A of the body seal ring, the air inlet chamber of the casing is sealed and connected with the air inlet hole of the valve seat; the valve bolt is provided with an air groove E, an air groove F, a shaft shoulder, a guide wheel shaft, a retaining ring groove, a square head, Screw hole C, the valve bolt can slide axially in the valve hole of the valve seat; the outer circle of the guide wheel A is alternately provided with a rear stop guide groove with a certain inclination angle, and a front stop guide groove with a certain inclination angle. , the front stop guide groove dead point, the shaft center through hole A, the small end is provided with a clamping groove A; the outer circle of the guide wheel B is provided with a guide rotation groove with a certain inclination angle, the guide groove stop point, and the shaft center through hole A; Hole B, the small end is provided with a slot B; the guide wheel B cooperates with the slot A of the guide wheel A through the slot B, so that the guide wheel A and the guide wheel B form a guide wheel group, and the rear stop guide slot, front stop guide slot and The guide groove constitutes a completed working guide groove. The guide wheel group is installed on the valve bolt guide wheel shaft and can be rotated; the valve bolt retaining ring groove is equipped with an E-type retaining ring, which is used to limit the axial direction of the guide wheel group and the valve bolt. The solid pin is inserted into the installation hole of the solid pin of the valve seat and placed in the working guide groove of the guide wheel group, and is restrained by the solid pin. It can perform specific axial movement and rotation movement; the sealing ring B and the baffle are placed in the casing sealing ring groove B and the baffle installation sink in turn, and the baffle is locked on the casing by screws B; the valve bolt guides The axle passes through the inner hole of the sealing ring B and the through hole of the casing into the square hole for installing the button of the casing. The sealing ring B plays the role of isolating the compressed air in the motor chamber of the casing from leaking to the outside of the casing; the button is provided with a spring The positioning shaft, square hole and screw hole are countersunk. The square hole is matched with the square head of the valve bolt and is locked by screw C, so that the valve bolt and the button are connected as a whole. It can only move axially but cannot rotate axially; the reset spring is placed between the housing spring positioning sink and the button spring positioning shaft, and plays the role of locking the positive and negative working state of the valve bolt and restoring the state; when the external force presses When pressing the button, the button pushes the valve bolt, E-type retaining ring, and guide wheel set to overcome the axial direction of the return spring. When the guide groove of the guide wheel B in the guide wheel group contacts the solid pin, the guide wheel group automatically rotates to avoid the solid pin, and finally the stop point of the guide groove of the guide wheel B is locked on the solid pin. Release the external force of the button. Under the action of the reset spring, the valve bolt, guide wheel group, E-type retaining ring, and button start to perform axial reset movement. When the front stop guide groove of the guide wheel A in the guide wheel group contacts the solid pin, The guide wheel group rotates automatically to avoid the solid pin, and finally the dead point of the front guide groove of the guide wheel A is locked on the solid pin. At this time, the air groove F of the valve bolt is connected to the air inlet hole of the valve seat and the air groove D. The valve bolt air groove E connects the valve seat air groove C and the housing exhaust chamber, so that the pneumatic wrench is switched to the reverse working state; when the button is pressed again by external force, the button pushes the valve bolt, E-type retaining ring, and guide wheel group. Overcoming the axial movement of the return spring, when the guide groove of the guide wheel B in the guide wheel group contacts the solid pin, the guide wheel group automatically rotates to avoid the solid pin, and finally the stop point of the guide groove of the guide wheel B is locked at the solid pin. The solid pin, at this time, releases the external force of the button. Under the action of the reset spring, the valve bolt, guide wheel group, E-type retaining ring, and button start to perform axial reset motion. When the guide groove of the guide wheel A in the guide wheel group stops When contacting the solid pin, the guide wheel group automatically rotates to avoid the solid pin, and finally the valve bolt shaft shoulder is locked on the solid pin. The bolt air groove F is connected to the air valve seat air groove D and the exhaust groove, so that the pneumatic wrench is switched to the working state of forward rotation. That is, every time the external force presses the button to the bottom and then releases it, the pneumatic wrench will switch and lock the working state of forward rotation and reverse rotation.

Preferably, the housing is provided with a motor chamber, an exhaust chamber, and an air intake chamber, a sealing ring groove A is provided at the mouth of the air intake chamber, a screw hole B is provided under the motor chamber of the housing, a baffle mounting sink, and a sealing ring is provided. Ring groove B, through hole, spring positioning sink, button installation square hole.

Preferably, the cylinder is placed in the motor group, and the cylinder is provided with an air groove A, an air groove B, a screw hole A, an eccentric inner hole, and an exhaust hole, and both ends are provided with arc grooves.

Preferably, the air valve seat is provided with a sealing ring groove C, an air groove C, an air groove D, an air inlet hole, an air exhaust groove, an air valve hole, a screw through hole A, a solid pin mounting hole, and a gas valve seat sealing ring. It is placed in the sealing ring groove C to isolate the channeling between the air groove C, the air groove D and the outside world; the air valve seat is connected with the cylinder through the screw A, so that the air groove C and the air cylinder air groove A are always connected, and the air groove D is always communicated with the cylinder air groove B, and the air inlet hole is always communicated with the air intake chamber of the casing; the sealing ring A is placed in the groove A of the casing sealing ring, so that the air intake chamber of the casing is in sealing communication with the air inlet hole of the valve seat.

Preferably, the valve bolt is provided with an air groove E, an air groove F, a shaft shoulder, a guide wheel shaft, a retaining ring groove, a square head, and a screw hole C, and the valve bolt can slide axially in the valve hole of the valve seat.

Preferably, the outer circle of the guide wheel A is alternately provided with a rear stop guide slot with a certain inclination angle, a front stop guide slot with a certain inclination angle, a dead point of the front stop guide slot, a shaft center through hole A, and a small end There is a card slot A.

Preferably, the outer circle of the guide wheel B is provided with a guide groove with a certain inclination angle, the stop point of the guide groove, and the through hole B of the shaft center, and the small end is provided with a clamping groove B; The guide pulley A is matched with the groove A, so that the guide pulley A and the guide pulley B form a guide pulley group. The rear stop guide groove, the front stop guide groove and the guide rotation groove form a completed working guide groove. The wheel shaft can be rotated; the valve bolt retaining ring groove is equipped with an E-type retaining ring, which is used to limit the axial relative movement of the guide wheel group and the valve bolt, so that the guide wheel group and the valve bolt can move axially together.

Preferably, the solid pin is inserted into the installation hole of the solid pin of the valve seat and placed in the working guide groove of the guide wheel set. The guide wheel set can only perform specific axial movement and autorotation movement due to the restraint of the solid pin.

Preferably, the button is provided with a spring positioning shaft, a square hole, and a screw sink, the square hole is matched with the square head of the valve bolt, and is locked by a screw C, so that the valve bolt and the button are integrally connected, and the button is installed on the installation side of the shell button. In the hole, the valve bolt and the key can only move axially but cannot rotate axially.

Preferably, the reset spring is placed between the housing spring positioning sink and the button spring positioning shaft, and plays the role of locking the forward and reverse working state of the valve bolt and restoring the state.

Compared with the prior art, the beneficial effects of the present invention are: a device for switching and locking the forward and reverse functions of the pneumatic wrench is adopted. A self-locking button is used to switch the forward and reverse rotation of the pneumatic wrench, which simplifies the operation. All personnel can obtain the same operating feel, which reduces the occurrence of misoperation.

Description of drawings

Fig. 1 is the exploded structure schematic diagram of the present invention

Fig. 2 is the exploded structure schematic diagram of the present invention

Figure 3 is a schematic diagram of the upper half of the shell

Figure 4 is a schematic diagram of the cylinder structure

Figure 5 is a schematic diagram of the structure of the upper half of the valve seat

Figure 6 is a schematic diagram of the valve plug structure

Figure 7 is a schematic diagram of the structure of Introduction A

Figure 8 is a schematic diagram of the structure of Introduction B

Figure 9 is a schematic diagram of the structure of the upper part of the button

Figure 10 is a schematic diagram of the partial structure of the present invention

Figure 11 is a schematic diagram of the structure of the present invention in the forward rotation working state

Fig. 12 is the state schematic diagram of the first step of switching the reverse working state of the present invention

Fig. 13 is the state schematic diagram of the first step of switching to the reverse working state of the present invention

14 is a schematic diagram of the process of switching the forward rotation working state of the present invention

Figure 15 is a schematic diagram of the gas flow in the left half of the forward rotation state

Figure 16 is a schematic diagram of the gas flow in the left half of the reverse state

Figure 17 is a schematic diagram of the lower half of the valve seat

Figure 18 is a schematic diagram of the structure of the lower half of the button

Figure 19 is a schematic cross-sectional view of the forward rotation working state

Figure 20 is a schematic cross-sectional view of the present invention switching to the reverse working state

Figure 21 is a schematic diagram of the lower half of the housing

Figure 22 is a schematic diagram of the gas flow in the right half of the forward rotation state

Figure 23 is a schematic diagram of the gas flow in the right half of the reverse state

Fig. 24 is the state schematic diagram of the second step of switching the reverse working state of the present invention

Fig. 25 is a state schematic diagram of the third step of switching the reverse working state of the present invention

Fig. 26 is the state schematic diagram of the second step of switching to the reverse working state of the present invention

Figure 27 is a state schematic diagram of the present invention switching to the third step of the reverse working state

FIG. 28 is a state diagram of the fourth step of switching to the reverse working state of the present invention.

In the picture: 1 shell 1-1 motor chamber 1-2 exhaust chamber 1-3 intake chamber 1-4 sealing ring groove A 1-5 screw hole B 1-6 baffle mounting sink 1-7 sealing ring groove B 1-8 Through hole 1-9 Spring positioning sink 1-10 Button mounting square hole 2 Air cylinder 2-1 Air groove A 2-2 Air groove B 2-3 Tap hole A 2-4 Eccentric inner hole 2-5 rows Air hole 2-6 Arc groove 3 Screw A 4 Air valve seat seal 5 Air valve seat 5-1 Seal ring groove C 5-2 Air groove C 5-3 Air groove D 5-4 Air inlet 5-5 rows Air groove 5-6 Air valve hole 5-7 Screw through hole A 5-8 Solid pin mounting hole 6 Seal ring A 7 Valve bolt 8 Guide wheel A 8-1 Rear guide groove 8-2 Front guide groove 8-3 Front stop guide groove dead point 8-4 Axle through hole A 8-5 Card slot A 9 Guide wheel B 9-1 Guide groove 9-2 Guide groove dead point 9-3 Axle through hole B 9-4 Card Slot B 10 E-type retaining ring 11 Solid pin 12 Screw B 13 Bezel 14 Sealing ring B 15 Button 15-1 Spring positioning shaft 15-2 Square hole 15-3 Screw hole counter 16 Return spring 17 Screw C 18 Motor group 19 Strike group 20 guide wheel group.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The present invention provides a technical solution: a device for switching and locking the forward and reverse states of a pneumatic wrench with one button comprises a casing 1, a cylinder 2, a screw A3, a valve seat sealing ring 4, a gas valve seat 5, and a sealing ring A6 , valve bolt 7, guide wheel A8, guide wheel B9, E-type retaining ring 10, solid pin 11, screw B12, baffle 13, sealing ring B14, button 15, return spring 16, screw C17; housing 1 is equipped with a motor Chamber 1-1, exhaust chamber 1-2, intake chamber 1-3, a sealing ring groove A1-4 is provided at the mouth of intake chamber 1-3, and a screw hole B1 is provided under the motor chamber 1-1 of housing 1 -5, baffle installation sink 1-6, sealing ring groove B1-7, through hole 1-8, spring positioning sink 1-9, button installation square hole 1-10; cylinder 2 is placed in motor group 18, Cylinder 2 is provided with air groove A2-1, air groove B2-2, screw hole A2-3, eccentric inner hole 2-4, exhaust hole 2-5, both ends are provided with arc groove 2-6; air valve seat 5. There are sealing ring groove C5-1, air groove C5-2, air groove D5-3, air inlet hole 5-4, exhaust groove 5-5, air valve hole 5-6, screw through hole A5-7, Solid pin mounting holes 5-8, the air valve seat sealing ring 4 is placed in the sealing ring groove C5-1, the air valve seat 5 is connected with the cylinder 2 through the screw A3, so that the air groove C5-2 and the air groove A2-1 of the air cylinder 2 Always connected, the air groove D5-3 is always connected with the air groove B2-2 of the cylinder 2, the air inlet 5-4 is always connected with the air inlet chamber 1-3 of the housing 1; the sealing ring A6 is placed in the sealing ring groove A1 of the housing 1 In -4, the air inlet chamber 1-3 of the housing 1 and the air inlet hole 5-4 of the valve seat 5 are sealed in communication; the valve bolt 7 is provided with an air groove E7-1, an air groove F7-2, and a shaft shoulder 7-3 , guide wheel shaft 7-4, retaining ring groove 7-5, square head 7-6, screw hole C7-7, valve bolt 7 can slide axially in valve seat 5 and valve hole 5-6; outside guide wheel A8 The circle is alternately provided with a rear guide groove 8-1 with a certain inclination angle, a front guide groove 8-2 with a certain inclined angle, a dead point of the front guide groove 8-3, and an axial through hole A8-4. The small end is provided with a card slot A8-5; the outer circle of the guide wheel B9 is provided with a guide groove 9-1 with a certain inclination angle, the stop point of the guide groove 9-2, and the shaft through hole B9-3. There is a card slot B9-4; the guide wheel B9 is matched with the guide wheel A8 card slot A8-5 through the card slot B9-4, so that the guide wheel A8 and the guide wheel B9 form the guide wheel group 20, the rear stop guide groove 8-1, the front The stop guide groove 8-2 and the guide rotation groove 9-1 form a completed working guide groove. The guide wheel group 20 is installed on the guide wheel shaft 7-4 of the valve bolt 7 and can be rotated; the valve bolt 7 retaining ring groove 7-5 is installed An E-type retaining ring 10 is used to limit the axial relative movement of the guide wheel group 20 and the valve bolt 7, so that the guide wheel group 20 and the valve bolt 7 can move axially together; the solid pin 11 is inserted into the valve seat 5 solid pin The installation holes 5-8 are placed in the working guide groove of the guide wheel group 20, restrained by the solid pin 11, the guide wheel group 20 can only perform specific axial movement and autorotation movement; the sealing ring B14 and the baffle 13 are placed in sequence In the housing 1 sealing ring groove B1-7, baffle installation sink 1-6, through Screw B12 to lock the baffle plate 13 on the shell 1; the valve bolt 7 guide wheel shaft 7-4 passes through the inner hole of the sealing ring B14 and the through hole 1-8 of the shell 1 into the square hole 1-10 of the shell 1 button installation , the sealing ring B14 plays the role of isolating the compressed air in the motor chamber 1-1 of the casing 1 from leaking to the outside of the casing 1; -3, the square hole 15-2 is matched with the square head 7-6 of the valve bolt 7, and is locked by the screw C17, so that the valve bolt 7 and the button 15 are connected as a whole, and the button 15 is installed in the casing 1 button installation square hole 1-10 , restricting the valve bolt 7 and the button 15 to only move axially but not to rotate axially; the return spring 16 is placed between the spring positioning sink 1-9 of the shell 1 and the spring positioning shaft 15-1 of the button 15 to lock the valve The function of the positive and negative working state of the bolt 7 and the state reset; when the external force presses the button 15, the button 15 pushes the valve bolt 7, the E-type retaining ring 10, and the guide wheel group 20 to overcome the axial movement of the reset spring 16. When the guide wheel group 20 When the guide groove 9-1 of the middle guide wheel B9 contacts the solid pin 11, the guide wheel group 20 automatically rotates to avoid the solid pin 11, and finally the stop point 9-2 of the guide groove of the guide wheel B9 is locked on the solid pin. 11. At this time, the external force of the button 15 is released. Under the action of the reset spring 16, the valve bolt 7, the guide wheel group 20, the E-type retaining ring 10, and the button 15 start to make an axial reset movement. When the guide wheel in the guide wheel group 20 When the front stop guide groove 8-2 of A8 contacts the solid pin 11, the guide wheel group 20 automatically rotates to avoid the solid pin 11, and finally the stop point 8-3 of the guide wheel A8 is locked on the solid pin 11. At this time, the air groove F7-2 of the valve bolt 7 is connected to the air inlet hole 5-4 of the valve seat 5 and the air groove D5-3, and the air groove E7-1 of the valve bolt 7 is connected to the air groove C5-2 of the valve seat 5 and the air groove D5-3. Shell 1 exhaust chamber 1-2, so that the pneumatic wrench is switched to the reverse working state; when the button 15 is pressed by external force again, the button 15 pushes the valve bolt 7, E-type retaining ring 10, and guide wheel group 20 to overcome the return spring 16 axis When the guide groove 9-1 of the guide wheel B9 in the guide wheel group 20 contacts the solid pin 11, the guide wheel group 20 automatically rotates in order to avoid the solid pin 11, and finally the guide groove of the guide wheel B9 stops at the point of rotation. 9-2 is locked on the solid pin 11, at this time, the external force of the button 15 is released. Under the action of the return spring 16, the valve bolt 7, the guide wheel group 20, the E-type retaining ring 10, and the button 15 start to make an axial reset movement. When the rear stop guide groove 8-1 of the guide wheel A8 in the guide wheel set 20 contacts the solid pin 11, the guide wheel set 20 automatically rotates to avoid the solid pin 11, and finally the shaft shoulder 7-3 of the valve bolt 7 is locked in the solid pin 11. Solid pin 11. At this time, the air groove E7-1 of the valve bolt 7 is connected to the air inlet hole 5-4 of the valve seat 5 and the air groove C5-2, and the air groove F7-2 of the valve bolt 7 is connected to the air groove D5 of the valve seat 5. -3 and exhaust grooves 5-5, make the pneumatic wrench switch to the working state of forward rotation. That is, every time the external force presses the button 15 to the bottom and then releases it, the pneumatic wrench will switch and lock the working state of forward rotation and reverse rotation.

As shown in Fig. 1 and Fig. 3, the housing 1 is provided with a motor chamber 1-1, an exhaust chamber 1-2, and an intake chamber 1-3, and a sealing ring groove A1-4 is provided at the mouth of the intake chamber 1-3. , there are screw holes B1-5 under the housing 1 motor chamber 1-1, baffle mounting sinks 1-6, sealing ring grooves B1-7, through holes 1-8, spring positioning sinks 1-9, button installation Square holes 1-10.

As shown in Figure 4, the cylinder 2 is placed in the motor group 18, and the cylinder 2 is provided with an air groove A2-1, an air groove B2-2, a screw hole A2-3, an eccentric inner hole 2-4, and an exhaust hole 2-5 , there are arc grooves 2-6 on both ends.

As shown in Figure 1, Figure 4 and Figure 5, the valve seat 5 is provided with a sealing ring groove C5-1, an air groove C5-2, an air groove D5-3, an air inlet hole 5-4, and an air outlet groove 5-5 , air valve hole 5-6, screw through hole A5-7, solid pin mounting hole 5-8, the air valve seat sealing ring 4 is placed in the sealing ring groove C5-1, isolating the air groove C5-2, the air groove D5- 3 and the outside world; the air valve seat 5 is connected with the cylinder 2 through the screw A3, so that the air groove C5-2 is always connected with the air groove A2-1 of the air cylinder 2, and the air groove D5-3 is connected with the air groove of the air cylinder 2. B2-2 is always connected, and the air inlet hole 5-4 is always connected with the air inlet chamber 1-3 of the housing 1; the sealing ring A6 is placed in the sealing ring groove A1-4 of the housing 1, so that the air inlet chamber 1-3 of the housing 1 3 is in sealing communication with the air inlet hole 5-4 of the valve seat 5.

As shown in Figures 5 and 6, the valve bolt 7 is provided with an air groove E7-1, an air groove F7-2, a shaft shoulder 7-3, a guide wheel shaft 7-4, a retaining ring groove 7-5, and a square head 7-6 , Screw hole C7-7, valve bolt 7 can slide axially in valve seat 5 and valve hole 5-6.

As shown in Figure 7, the outer circle of the guide wheel A8 is alternately provided with a rear guide groove 8-1 with a certain inclined angle, a front guide groove 8-2 with a certain inclined angle, and a front guide groove dead point 8- 3. The shaft through hole A8-4, and the small end is provided with a card slot A8-5.

As shown in Figure 7, Figure 8 and Figure 10, the outer circumference of the guide wheel B9 is provided with a guide groove 9-1 with a certain inclination angle, a stop point 9-2 of the guide groove, and a shaft through hole B9-3. There is a card slot B9-4 at the end; the guide wheel B9 cooperates with the guide wheel A8 card slot A8-5 through the card slot B9-4, so that the guide wheel A8 and the guide wheel B9 form a guide wheel group 20, and the rear stop guide groove 8-1 , The front stop guide groove 8-2 and the guide groove 9-1 form a completed working guide groove. The guide wheel group 20 is installed on the valve bolt 7 guide wheel shaft 7-4 and can be rotated; the valve bolt 7 retaining ring groove 7- 5. Install an E-type retaining ring 10 to limit the axial relative movement of the guide wheel group 20 and the valve bolt 7, so that the guide wheel group 20 and the valve bolt 7 move axially together.

As shown in FIG. 10 , the solid pin 11 is inserted into the solid pin mounting holes 5-8 of the valve seat 5 and placed in the working guide groove of the guide wheel group 20. Due to the restraint of the solid pin 11, the guide wheel group 20 can only be used for a specific purpose. Axial motion and rotational motion.

As shown in Figures 9 to 10, the button 15 is provided with a spring positioning shaft 15-1, a square hole 15-2, and a screw sink. The square hole 15-2 is matched with the square head 7-6 of the valve bolt 7, and is locked by a screw C17. Tighten, connect the valve bolt 7 and the button 15 as a whole, and the button 15 is installed in the button installation square hole 1-10 of the casing 1, so that the valve bolt 7 and the button 15 can only move axially and cannot rotate axially.

As shown in FIG. 10 , the return spring 16 is placed between the spring positioning sink 1-9 of the housing 1 and the spring positioning shaft 15-1 of the button 15, and plays the role of locking the forward and reverse working state of the valve bolt 7 and restoring the state.

As shown in Figure 11 to Figure 14, the following is an explanation of the forward and reverse switching principle of a device of the present invention that uses a button to switch and lock the forward and reverse state of the pneumatic wrench:

In the forward rotation state, under the action of the return spring 16, the shaft shoulder 7-3 of the valve bolt 7 is locked on the solid pin 11. At this time, the air groove E7-1 of the valve bolt 7 is connected to the air inlet hole 5-4 of the valve seat 5 and the air valve. Slot C5-2, valve bolt 7, air groove F7-2 is connected to valve seat 5, air groove D5-3 and exhaust groove 5-5. At this time, it is in the forward rotation working state, and the air intake of the pneumatic wrench will work forward.

In the reversed state, when the external force presses the button 15, the button 15 pushes the valve bolt 7, the E-type retaining ring 10, and the guide wheel group 20 to overcome the return spring 16 to move axially. When -1 contacts the solid pin 11, the guide wheel group 20 automatically rotates to avoid the solid pin 11, and finally the stop point 9-2 of the guide groove of the guide wheel B9 is locked on the solid pin 11, and the external force of the button 15 is released at this time. , Under the action of the return spring 16, the valve bolt 7, the guide wheel group 20, the E-type retaining ring 10, and the button 15 start to make an axial reset movement. When contacting the solid pin 11, the guide wheel group 20 automatically rotates to avoid the solid pin 11, and finally the dead point 8-3 of the front guide groove of the guide wheel A8 is locked on the solid pin 11. At this time, the valve bolt 7 air groove F7 -2 is connected to the air inlet hole 5-4 of the valve seat 5 and the air groove D5-3, and the air groove E7-1 of the valve bolt 7 is connected to the air groove C5-2 of the valve seat 5 and the exhaust chamber 1-2 of the shell 1 , at this time switch to the reverse working state, the air intake of the pneumatic wrench will work reversely.

Return to the forward rotation state, when the button 15 is pressed again by the external force, the button 15 pushes the valve bolt 7, the E-type retaining ring 10, and the guide wheel group 20 to overcome the axial movement of the return spring 16. When the guide wheel B9 in the guide wheel group 20 rotates When the groove 9-1 contacts the solid pin 11, the guide wheel group 20 automatically rotates to avoid the solid pin 11, and finally the stop point 9-2 of the guide groove of the guide wheel B9 is locked on the solid pin 11, and the button 15 is released at this time. Under the action of the reset spring 16, the valve bolt 7, the guide wheel group 20, the E-type retaining ring 10, and the button 15 start to make an axial reset movement. When -1 contacts the solid pin 11, the guide wheel group 20 automatically rotates to avoid the solid pin 11, and finally the shaft shoulder 7-3 of the valve bolt 7 is locked on the solid pin 11. At this time, the air groove E7-1 of the valve bolt 7 is connected The air inlet hole 5-4 and the air groove C5-2 of the valve seat 5 are connected, and the air groove F7-2 of the valve bolt 7 is connected to the air groove D5-3 of the valve seat 5 and the exhaust groove 5-5, and the switch is positive at this time. When it turns to working state, the air intake of the pneumatic wrench will work forward.

As shown in Figure 15 to Figure 16, the following is a description of the gas flow when a device of the present invention that uses a button to switch and lock the forward and reverse states of the pneumatic wrench is working:

During the air intake process in the forward rotation working state, when the pneumatic wrench is connected to the air source and the switch is turned on, the compressed air enters the air inlet chamber 1-3 of the housing 1, passes through the air inlet hole 5-4 of the valve seat 5, and the air groove of the valve bolt 7 E7-1, air valve seat 5 air groove C5-2, enter the motor group 18 cylinder 2 air groove A2-1, make the motor group 18 rotate clockwise and drive the strike group 19 to rotate clockwise.

The exhaust process in the forward working state is divided into two parts:

Part of the exhaust gas is discharged from the exhaust hole 2-5 of the cylinder 2 of the motor group 18, and is discharged to the outside through the exhaust chamber 1-2 of the casing 1.

The rest of the exhaust gas is discharged from the air groove B2-2 of the motor group 18 cylinder 2, and enters the housing row 1 through the air valve seat 5 air groove D5-3, the valve bolt 7 air groove F7-2, and the air valve seat 5 exhaust groove 5-5 The air chambers 1-2 are exhausted from the outside.

The compressed air continues to flow through the above path, which can realize the continuous clockwise rotation of the pneumatic wrench.

Reverse the air intake process in the working state. When the pneumatic wrench is connected to the air source and the switch is turned on, the compressed air enters the air intake chamber 1-3 of the housing 1, passes through the air valve seat 5 air intake hole 5-4, and the valve bolt 7 air groove F7-2, valve seat 5, air groove D5-3, enter the motor group 18, cylinder 2 air groove B2-2, and make the motor group 18 rotate counterclockwise to drive the strike group 19 to also rotate counterclockwise.

The exhaust process in the reverse working state is divided into two parts:

①Part of the exhaust gas is discharged from the exhaust hole 2-5 of the cylinder 2 of the motor group 18, and is discharged to the outside through the exhaust chamber 1-2 of the casing 1.

②The rest of the exhaust gas is discharged from the air groove A2-1 of the motor group 18 cylinder 2, and enters the housing 1 through the air groove C5-2 of the valve seat 5, the air groove E7-1 of the valve bolt 7, and the valve hole 5-6 of the air valve seat 5 The exhaust chamber 1-2 is discharged to the outside.

The compressed air continues to flow through the above path, which can realize the continuous counterclockwise rotation of the pneumatic wrench. If you need to switch the reverse operation, just press the button 15 to switch the working state.

Working principle: For this type of device that uses a button to switch and lock the forward and reverse function of the pneumatic wrench, in the forward rotation state, under the action of the return spring, the valve bolt shaft shoulder is locked on the solid pin, and the valve bolt air groove E is connected at this time. The air inlet hole and air groove C of the air valve seat are connected, and the air groove F of the valve plug is connected to the air groove D and the exhaust groove of the air valve seat. At this time, it is in the working state of forward rotation, and the air intake of the pneumatic wrench will work in forward rotation;

In the reversed state, when the button is pressed by external force, the button pushes the valve bolt, E-type retaining ring, and the guide wheel group to overcome the axial movement of the return spring. When the guide groove of the guide wheel B in the guide wheel group contacts the solid pin, the guide wheel group In order to avoid the solid pin, it rotates automatically, and finally the stop point of the guide groove of the guide wheel B is locked on the solid pin. At this time, the external force of the button is released. The ring and the button start to perform axial reset movement. When the front stop guide groove of the guide wheel A in the guide wheel group contacts the solid pin, the guide wheel group automatically rotates to avoid the solid pin, and finally the front stop guide groove of the guide wheel A is set. The dead point is locked on the solid pin. At this time, the valve plug air groove F is connected to the air inlet hole of the valve seat and the air groove D, and the valve plug air groove E is connected to the air valve seat air groove C and the housing exhaust chamber. At this time Switch to the reverse working state, the air intake of the pneumatic wrench will work reversely;

Return to the forward rotation state, when the button is pressed again by external force, the button pushes the valve bolt, E-type retaining ring, and the guide wheel group to overcome the axial movement of the return spring. When the guide groove of the guide wheel B in the guide wheel group contacts the solid pin, the guide wheel The wheel set rotates automatically to avoid the solid pin, and finally the stop point of the guide groove of the guide wheel B is locked on the solid pin. At this time, the external force of the button is released. Under the action of the return spring, the valve bolt, guide wheel set, E The retaining ring and the button start to perform axial reset movement. When the rear stop guide groove of the guide wheel A in the guide wheel group contacts the solid pin, the guide wheel group automatically rotates to avoid the solid pin, and finally the valve bolt shaft shoulder is locked. For the solid pin, the valve plug air groove E is connected to the air inlet hole of the valve seat and the air groove C, and the valve plug air groove F is connected to the valve seat air groove D and the exhaust groove. At this time, it switches to the forward rotation working state. , the air intake of the pneumatic wrench will work forward.

The following is a description of the gas flow during operation of a device of the present invention that uses a button to switch and lock the forward and reverse states of the pneumatic wrench:

In the air intake process in the forward rotation working state, when the pneumatic wrench is connected to the air source and the switch is turned on, the compressed air enters the air intake chamber of the housing, and enters through the air inlet hole of the valve seat, the air groove E of the valve bolt, the air groove C of the valve seat, The air groove A of the motor group cylinder makes the motor group rotate clockwise to drive the strike group to rotate clockwise.

The exhaust process in the forward working state is divided into two parts:

Part of the exhaust gas is discharged from the exhaust hole of the cylinder of the motor group, and is discharged to the outside through the exhaust chamber of the casing.

The rest of the exhaust gas is discharged from the cylinder air groove B of the motor group, and enters the housing exhaust chamber through the valve seat air groove D, valve plug air groove F, and valve seat exhaust groove to be discharged to the outside world.

The compressed air continues to flow through the above path, which can realize the continuous clockwise rotation of the pneumatic wrench. If you need to switch the reverse operation, you only need to press the button to switch the working state.

Reverse the air intake process in the working state. When the pneumatic wrench is connected to the air source and the switch is turned on, the compressed air enters the air intake chamber of the housing, and enters through the air inlet hole of the valve seat, the air groove F of the valve bolt, and the air groove D of the valve seat. The air groove B of the motor group cylinder makes the motor group rotate counterclockwise to drive the strike group to rotate counterclockwise.

The exhaust process in the reverse working state is divided into two parts:

The rest of the exhaust gas is discharged from the cylinder air groove A of the motor group, and enters the housing exhaust chamber through the valve seat air groove C, the valve plug air groove E, and the valve seat air valve hole to be discharged to the outside world.

The compressed air continues to flow through the above path, which can realize the continuous counterclockwise rotation of the pneumatic wrench. If you need to switch the reverse operation, you only need to press the button to switch the working state.

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims

A device that uses a button to switch and lock the forward and reverse functions of a pneumatic wrench, including a casing, a cylinder, a screw A, a valve seat seal, a valve seat, a seal A, a valve bolt, a guide wheel A, and a guide wheel B , E-type retaining ring, solid pin, screw B, baffle, sealing ring B, button, return spring, screw C, characterized in that: the housing is provided with a motor chamber, an exhaust chamber, an air intake chamber, and an air intake chamber. There is a sealing ring groove A at the mouth of the chamber, and a screw hole B, a baffle mounting sink, a sealing ring slot B, a through hole, a spring positioning sink, and a button mounting square hole are arranged under the motor chamber of the housing; In the motor group, the cylinder is provided with air groove A, air groove B, screw hole A, eccentric inner hole, exhaust hole, and arc grooves on both ends; the air valve seat is provided with sealing ring groove C, air groove C , air groove D, air intake hole, exhaust groove, air valve hole, screw through hole A, solid pin installation hole, the air valve seat sealing ring is placed in the sealing ring groove C, and the air valve seat is connected with the cylinder through the screw A, The air groove C is always communicated with the cylinder air groove A, the air groove D is always communicated with the cylinder air groove B, and the air inlet hole is always communicated with the housing air inlet chamber; the sealing ring A is placed in the housing sealing ring groove A, The air inlet chamber of the housing is sealed and communicated with the air inlet hole of the valve seat; the valve bolt is provided with an air groove E, an air groove F, a shaft shoulder, a guide wheel shaft, a retaining ring groove, a square head, and a screw hole C, and the valve bolt can be It slides axially in the valve hole of the valve seat; the outer circle of the guide wheel A is alternately provided with a rear stop guide slot with a certain inclination angle, a front stop guide slot with a certain inclination angle, and a dead point of the front stop guide slot. , A shaft center through hole A, the small end is provided with a card slot A; the outer circle of the guide wheel B is provided with a guide groove with a certain inclination angle, the guide groove stop point, and the shaft center through hole B, and the small end is provided with Card slot B; the guide wheel B cooperates with the guide wheel A card slot A through the card slot B, so that the guide wheel A and the guide wheel B form a guide wheel group, and the rear stop guide groove, the front stop guide groove and the guide rotation groove form a complete The working guide groove, the guide wheel group is installed on the valve bolt guide wheel shaft and can be rotated; the valve bolt retaining ring groove is equipped with an E-type retaining ring, which is used to limit the axial relative movement of the guide wheel group and the valve bolt, so that the guide wheel The group moves axially together with the valve bolt; the solid pin is inserted into the installation hole of the solid pin of the valve seat and placed in the working guide groove of the guide wheel group. Due to the restraint of the solid pin, the guide wheel group can only make a specific axial movement. The sealing ring B and the baffle are placed in the casing sealing ring groove B and the baffle installation sink in turn, and the baffle is locked on the casing by the screw B; , The through hole of the casing penetrates into the square hole of the button installation of the casing, and the sealing ring B plays the role of isolating the compressed air in the motor chamber of the casing from leaking to the outside of the casing; the button is provided with a spring positioning shaft, a square hole, a screw The hole is submerged in the table, the square hole is matched with the square head of the valve bolt, and the valve bolt and the button are connected together by screw C locking. Axial rotation; the return spring is placed between the housing spring positioning sink and the button spring positioning shaft.
A device for switching and locking the forward and reverse functions of a pneumatic wrench by using a button according to claim 1, wherein the housing is provided with a motor chamber, an exhaust chamber, an air intake chamber, and the mouth of the air intake chamber is provided with There is a sealing ring groove A, and a screw hole B, a baffle mounting sink, a sealing ring slot B, a through hole, a spring positioning sink, and a button mounting square hole are arranged under the motor chamber of the housing.
A device for switching and locking the forward and reverse functions of a pneumatic wrench by using one button according to claim 1, wherein the air cylinder is placed in the motor group, and the air cylinder is provided with an air groove A, an air groove B, and a screw hole. A. The eccentric inner hole and the exhaust hole are provided with arc grooves on both ends.
A device for switching and locking the forward and reverse functions of a pneumatic wrench with one button according to claim 1, wherein the gas valve seat is provided with a sealing ring groove C, an air groove C, an air groove D, an air inlet Hole, exhaust groove, air valve hole, screw through hole A, solid pin installation hole, the air valve seat sealing ring is placed in the sealing ring groove C to isolate the channeling between the air groove C, the air groove D and the outside world. ;The valve seat is connected with the cylinder through the screw A, so that the air groove C is always connected with the air groove A of the cylinder, the air groove D is always connected with the air groove B of the cylinder, and the air inlet hole is always connected with the air inlet chamber of the housing; In the casing sealing ring groove A, the casing air inlet chamber is in sealing communication with the air inlet hole of the valve seat.
A device for switching and locking the forward and reverse functions of a pneumatic wrench with one button according to claim 1, wherein the valve bolt is provided with an air groove E, an air groove F, a shaft shoulder, a guide wheel shaft, a retaining ring Slot, square head, screw hole C, the valve bolt can slide axially in the valve hole of the valve seat.
A device for switching and locking the forward and reverse functions of a pneumatic wrench with one button according to claim 1, wherein the outer circle of the guide wheel A is alternately provided with a rear stop guide groove with a certain inclination angle, an opening There is a front stop guide groove with a certain inclination angle, a stop point of the front stop guide groove, a through hole A in the shaft center, and a card groove A at the small end.
A device for switching and locking the forward and reverse functions of a pneumatic wrench by using a button according to claim 1, wherein the outer circle of the guide wheel B is provided with a guide groove and a guide groove with a certain inclination angle. The stop point and the through hole B of the shaft center, and the small end is provided with a slot B; the guide wheel B is matched with the slot A of the guide wheel A through the slot B, so that the guide wheel A and the guide wheel B form a guide wheel group, and the rear stop guide groove , The front stop guide groove and the guide rotation groove form a completed working guide groove. The guide wheel group is installed on the valve bolt guide wheel shaft and can be rotated; the valve bolt retaining ring groove is equipped with an E-type retaining ring, which is used to limit the guide wheel group and the guide wheel. The relative axial movement of the valve bolt causes the guide wheel group to move axially together with the valve bolt.
A device for switching and locking the forward and reverse functions of a pneumatic wrench with one button according to claim 1, wherein the solid pin is inserted into the installation hole of the solid pin of the valve seat and placed in the working guide groove of the guide wheel group In the middle, due to the restraint of the solid pin, the guide wheel group can only perform specific axial motion and autorotation motion.
A device for switching and locking the forward and reverse functions of a pneumatic wrench by using a button according to claim 1, wherein the button is provided with a spring positioning shaft, a square hole, and a screw sink, and the square hole and the valve bolt are square. The head is matched and locked by screw C, so that the valve bolt and the button are connected as one.
A device for switching and locking the forward and reverse functions of a pneumatic wrench by using a button according to claim 1, wherein the return spring is placed between the housing spring positioning sink and the button spring positioning shaft to play the role of The function of locking the valve bolt forward and reverse working state and state reset.