Device for automatically adjusting angle of oil nozzle according to length change of cutter

Abstract

The invention relates to a device for automatically adjusting the angle of an oil nozzle according to the length change of a cutter, and belongs to the technical field of machining cooling. A first pawl moving unit of the device comprises a first air cylinder and a first pawl, a second pawl resetting unit comprises a second air cylinder and a second pawl, a ratchet wheel rotating unit comprises a rotating base, a ratchet wheel and a spring, a working unit comprises a rotating shaft and an oil spraying pipe, the ratchet wheel is rotatably installed on the rotating base, and the spring is connected with the ratchet wheel. The spring has potential energy for pulling the ratchet wheel to the initial position, the first air cylinder is in transmission connection with the first pawl and can pull the first pawl to enter or exit from the gear tooth path of the ratchet wheel, and the second air cylinder is in transmission connection with the second pawl and can pull the second pawl to drive the ratchet wheel to rotate in the direction away from the initial position. The tool nose position can be automatically recognized, the spraying angle is adjusted according to the change of the tool length, it is ensured that cutting fluid can be accurately sprayed to the tool nose position, and therefore the tool breaking risk is reduced, the tool replacement frequency and cost are reduced, and the workpiece surface machining quality and machining efficiency are improved.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical processing cooling, and in particular to a device for automatically adjusting the angle of an oil injection nozzle according to changes in tool length. Background Art

[0002] CNC (computer numerical control) machine tools are key equipment in modern manufacturing. They achieve efficient and high-precision processing of workpieces through precise numerical control technology. However, during the processing, the temperature of the tool and the workpiece will rise rapidly due to friction and heat generated by cutting, which poses a serious threat to the processing quality and tool life. To solve this problem, cutting fluids are widely used. The main functions of cutting fluids include cooling, lubrication, cleaning and rust prevention, among which the cooling effect is particularly critical. By effectively reducing the temperature in the cutting area, the cutting fluid can protect the tool and the workpiece from high temperature damage, thereby improving the processing accuracy and extending the tool life. However, in CNC machine tool processing, the change in tool length is an issue that cannot be ignored. Traditional CNC machine tool cutting fluid injection systems often use fixed-position nozzles and cannot automatically adjust the injection angle according to the change in tool length. When the tool length changes, the nozzle may not be able to accurately spray the cutting fluid to the tool tip position, resulting in the cutting fluid being unable to fully exert its cooling effect. This will cause the temperature of the tool and workpiece to be too high, which will accelerate the wear and damage of the tool, reduce the processing accuracy and surface quality, and may even cause machine tool failure and processing interruption. At present, the methods for adjusting the angle of the fuel injector according to the change of the length of the machining tool mainly include manual adjustment and stepper motor adjustment. The manual adjustment method affects the utilization rate of the machine tool; the motor adjustment method requires the installation of a complete drive control system and communication system, which is costly, and when the motor is used for adjustment, it is necessary to install wires on the fuel injector angle adjustment device. Setting wires in areas where the oil is wetted and the structure is mostly conductive steel will cause the risk of electric shock. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a device for automatically adjusting the angle of an oil injection nozzle according to changes in the length of a tool.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is: A device for automatically adjusting the angle of an oil injection nozzle according to the change of the tool length comprises a first ratchet movement unit, a second ratchet reset unit, a ratchet rotation unit, a working unit and a limiting unit, wherein the first ratchet movement unit comprises a first cylinder and a first ratchet, the second ratchet reset unit comprises a second cylinder and a second ratchet, the ratchet rotation unit comprises a rotating base, a ratchet and a spring, the working unit comprises a rotating shaft and an oil injection pipe, the ratchet is rotatably mounted on the rotating base, the spring is connected to the ratchet, the spring has the potential energy to pull the ratchet to an initial position, the limiting unit is used to adjust the initial position of the ratchet, and can The ratchet is limited to an initial position, a rotating shaft is mounted on the ratchet, and an oil injection pipe is fixed on the rotating shaft. When the ratchet rotates, the rotating shaft moves with it and changes the angle of the oil injection nozzle of the oil injection pipe. The first cylinder is connected to the first pawl in a transmission manner, and the first cylinder can pull the first pawl into or out of the tooth path of the ratchet. The second cylinder is connected to the second pawl in a transmission manner, and the second cylinder can pull the second pawl to make the second pawl drive the ratchet to rotate in a direction away from the initial position. When the first pawl enters the tooth path of the ratchet, the first pawl can limit the rotation of the ratchet toward the initial position, while not limiting the rotation of the ratchet away from the initial position.

[0005] To optimize the above technical solutions, the specific measures taken also include: The device for automatically adjusting the angle of the fuel injection nozzle according to the change of the tool length also includes a protective cover unit, which includes a base plate, a cover plate, a first side baffle, a second side baffle, a third side baffle, a front baffle and a rear baffle. The base plate, the cover plate, the first side baffle, the second side baffle, the third side baffle, the front baffle and the rear baffle together form a box body, and the first pawl movement unit, the second pawl reset unit, the ratchet rotation unit, the working unit and the limit unit are installed in the box body, wherein the upper end of the rotating shaft extends from the cover plate, and the fuel injection nozzle of the fuel injection pipe is located on the rotating shaft above the cover plate.

[0006] The first pawl motion unit also includes a first slide rail seat, a first slide rail, a first slider, a first push block, a first pull block, a first pin, a first threadless pin, a first torsion spring, a first protruding screw and a second protruding screw; the first slide rail seat is fixed to the base plate by bolt connection, the first cylinder and the first slide rail are fixedly arranged on the first slide rail seat, the first slide rail seat is fixed to the base plate, the first pin is installed and fixed on the first slide rail seat, the first push block is fixedly connected to the cylinder shaft of the first cylinder, the first push block is fixedly connected to the first pull block, the first push block is fixed on the first slider, the first slider is slidably installed on the first slide rail, the first pull block and the first pawl are hinged by the first threadless pin, and the first pawl can rotate around the first threadless pin Rotation; the second protruding screw is fixed on the first pawl, the first protruding screw is fixed on the first pulling block, the first torsion spring is installed on the first unthreaded pin, and the two force application points of the first torsion spring are respectively on the second protruding screw and the first protruding screw, the first torsion spring has the potential energy to push the first pawl toward the ratchet, when the cylinder shaft of the first cylinder retracts, the tip of the first pawl hooks into the wheel tooth gap of the ratchet, limiting the rotation of the ratchet to the initial position, while not limiting the rotation of the ratchet away from the initial position, when the cylinder shaft of the first cylinder is pushed out, the first push block, the first pulling block and the first pawl follow, the first pin touches the first pawl, causing the first pawl to rotate around the first unthreaded pin, and the tip of the first pawl withdraws from the wheel tooth gap of the ratchet.

[0007] The second pawl resetting unit also includes a slide slot, a second push block, a second pin, a third pin, a second non-threaded pin, a second torsion spring, a third protruding screw and a fourth protruding screw. The slide slot is fixed to the base plate, the second pin is fixed to the base plate, the second cylinder is fixed to the slide slot, the third pin is fixed to the slide slot, the second push block is fixedly connected to the cylinder shaft of the second cylinder, the second push block and the second pawl are hingedly connected through the second non-threaded pin, so that the second pawl can rotate around the second non-threaded pin, the third protruding screw is fixed to the second push block, the fourth protruding screw is fixed to the second pawl, and the second torsion spring is installed on the second non-threaded pin. At the same time, the two force application points of the second torsion spring are respectively on the third protruding screw and the fourth protruding screw; the second torsion spring has the potential energy to push the second pawl toward the ratchet. When the second cylinder extends to a predetermined position, the third pin can prevent the second cylinder from continuing to extend. At this time, the tip of the second pawl is hooked into the tooth gap of the ratchet at a predetermined position. When the second cylinder retracts, the second cylinder drives the second push block and the second pawl to move, and the second pawl pushes the ratchet in a direction away from the initial position to rotate the ratchet. When the second pin touches the second pawl, the second pawl rotates around the second unthreaded pin, and the tip of the second pawl withdraws from the tooth gap of the ratchet.

[0008] The ratchet rotating unit also includes a ratchet pad, a pressure block, a second slide rail seat and a second slider. The rotating base and the second slide rail seat are fixed on the base plate. The ratchet pad can be rotatably installed on the rotating base. The rotating axis of the ratchet is fixed on the ratchet pad. The pressure block is used to press the ratchet so that it cannot move up and down. The second slider is slidably installed on the slide rail of the second slide rail seat. The second slider is fixedly connected to the wheel surface of the ratchet. One end of the spring is connected to the ratchet, and the other end is connected to the second slide rail seat.

[0009] The pressing block is mounted on the rotating base by fixing screws.

[0010] The working unit also includes a knob, which is fixed on the top of the rotating shaft and is used to pass the fuel injection pipe.

[0011] The limit unit includes a limit fixing block and a limit screw. The limit fixing block is fixed on the base plate, and the limit screw is installed on the limit fixing block. The end of the limit screw is used to limit the ratchet and serves as the initial position of the ratchet. The limit screw can adjust the position of the end to change the initial position of the ratchet.

[0012] The limit screw passes through the limit fixing block and can move forward and backward in the limit fixing block. The oil nozzle of the oil injection pipe is used to spray oil to the tool to cool the tool. The tool has various lengths. When the ratchet is in the initial position, the oil nozzle of the oil injection pipe just matches the shortest length tool.

[0013] The ventilation of the first cylinder and the second cylinder is controlled by two solenoid valves, which are controlled by the machine tool.

[0014] The beneficial effects of the present invention are: The device for automatically adjusting the angle of the oil nozzle according to the change of the tool length of the present invention can adjust the injection angle according to the change of the tool length, ensuring that the cutting fluid can be accurately sprayed to the tool tip position, thereby reducing the risk of tool breakage, reducing the frequency and cost of tool replacement, and improving the surface processing quality and processing efficiency of the workpiece.

[0015] When the present invention adjusts the angle of the fuel injector, two cylinders are used as power sources. The cylinders are pneumatically driven instead of motor driven. The advantages are that no wiring is required, the structure is easier to install, and it is more advantageous in resisting harsh environments such as oil pollution and water mist. In addition, no wiring and control such as a driver are required. In addition, the cylinders are provided with two solenoid valves, which are directly controlled by the machine tool IO, are easy to implement, and have good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a device for automatically adjusting the angle of a fuel injection nozzle according to a change in the length of a tool according to an embodiment of the present invention; Figure 2 This is a diagram showing the internal structure of a device for automatically adjusting the angle of a fuel injection nozzle according to a change in the length of a tool according to an embodiment of the present invention; Figure 3 This is a diagram showing the cooperation between the second push block and the slide groove of a device for automatically adjusting the angle of a fuel injection nozzle according to the change of the tool length according to an embodiment of the present invention; Figure 4 A schematic diagram of a ratchet rotating unit and a working unit of a device for automatically adjusting the angle of a fuel injection nozzle according to a change in the length of a tool according to an embodiment of the present invention; Description of the accompanying drawings: 1-fixing screw, 2-pressure block, 3-ratchet, 4-first pawl, 5-first protruding screw, 6-first pin, 7-first non-threaded pin, 8-first torsion spring, 9-second protruding screw, 10-first slide rail, 11-first pull block, 12-first push block, 13-first slide rail seat, 14-first cylinder, 15-bottom plate, 16-second cylinder, 17-slide groove, 18-second push block, 19-third protruding screw, 20-second torsion spring Spring, 21-third pin, 22-second non-threaded pin, 23-second pin, 24-fourth protruding screw, 25-second pawl, 26-spring, 27-second slide rail seat, 28-limit screw, 29-limit fixing block, 30-front baffle, 31-first side baffle, 32-injector nozzle, 33-knob, 34-cover, 35-rear baffle, 36-third side baffle, 37-rotating base, 38-ratchet pad, 39-rotating shaft, 40-second slider. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0018] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0019] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0020] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or units (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" / "several" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships, for example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0021] The purpose of the present invention is to provide a device for automatically adjusting the angle of the oil nozzle according to the change of the tool length, which can cooperate with the PLC to automatically identify the position of the tool tip and adjust the injection angle according to the change of the tool length to ensure that the cutting fluid can be accurately sprayed to the tool tip position, thereby reducing the risk of tool breakage, reducing the frequency and cost of tool replacement, and improving the surface processing quality and processing efficiency of the workpiece.

[0022] Figure 1 This is a schematic diagram of a device for automatically adjusting the angle of a fuel injection nozzle according to a change in tool length according to an embodiment of the present invention. Figure 2 This is a diagram showing the internal structure of a device for automatically adjusting the angle of a fuel injection nozzle according to changes in the length of a tool according to an embodiment of the present invention. Figure 3 This is a diagram showing the cooperation between the second push block and the slide groove of a device for automatically adjusting the angle of a fuel injection nozzle according to the change of the tool length according to an embodiment of the present invention. Figure 4Schematic diagram of a ratchet rotating unit and a working unit of a device for automatically adjusting the angle of a fuel injection nozzle according to the change of the tool length according to an embodiment of the present invention. Figure 1-Figure 4 The present invention is described in detail, and the device comprises: A device for automatically adjusting the angle of a fuel injection nozzle according to the change of the tool length, the processing device comprising: A first ratchet moving unit, a second ratchet resetting unit, a ratchet wheel rotating unit, a working unit, a limiting unit and a protective cover unit.

[0023] Among them, the first pawl motion unit includes: a first cylinder 14, a first slide rail seat 13, a first slide rail 10, a first slider, a first push block 12, a first pull block 11, a first pawl 4, a first pin 6, a first threadless pin 7, a first torsion spring 8, a first protruding screw 5 and a second protruding screw 9.

[0024] The second pawl resetting unit includes: a second cylinder 16 , a slide slot 17 , a second push block 18 , a second pawl 25 , a second pin 23 , a third pin 21 , a second non-threaded pin 22 , a second torsion spring 20 , a third protruding screw 19 and a fourth protruding screw 24 .

[0025] The ratchet rotating unit includes: a rotating base 37 , a ratchet pad 38 , a pressing block 2 , a fixing screw 1 , a second slide rail seat 27 , a second sliding block 40 , a spring 26 , and a ratchet 3 .

[0026] The working unit includes: a rotating shaft 39 , a knob 32 and an oil injection pipe 31 .

[0027] The limiting unit includes: a limiting fixing block 29 and a limiting screw 28 .

[0028] The protective cover unit includes: a bottom plate 15 , a cover plate 34 , a first side baffle 31 , a second side baffle 36 , a third side baffle 36 , a front baffle 30 and a rear baffle 35 .

[0029] In the first pawl motion unit, the first slide rail seat 13 is fixed to the base plate 15 by bolt connection, the first cylinder 14 and the first slide rail 10 are fixed to the first slide rail seat 13 by bolt connection, the first pin 6 is installed and fixed to the first slide rail seat 13, the first push block 12 is fixedly connected to the first cylinder 14 by threaded connection, the first push block 12 is fixedly connected to the first pull block 11 by bolt connection, the first push block 12 is fixedly connected to the first slider by bolt connection, the first slider is installed on the first slide rail 10, the first pull block 11 is connected to the first pawl 4 by the first non-threaded pin 7, so that the first pawl 4 can rotate around the first non-threaded pin 7; the first torsion spring 8 is installed on the first non-threaded pin 7, and the two force application points of the first torsion spring 8 are respectively on the first protruding screw 9 of the first pull block 11 and the second protruding screw 5 of the first pawl 4, so that the first pawl 4 can firmly clamp the ratchet 3.

[0030] In the second pawl resetting unit, the slide groove 17 is fixed to the base plate 15 by bolt connection, the second pin 23 is installed and fixed on the base plate 15, the second cylinder 16 is fixed to the slide groove 17 by bolt connection, the third pin 21 is installed and fixed on the slide groove 17, the second push block 18 is fixedly connected to the second cylinder 16 by threaded connection, and the second push block 18 is connected to the second pawl 25 by a second non-threaded pin 22 to realize the rotation of the second pawl 25 around the second non-threaded pin 22; the second torsion spring 20 is installed on the second non-threaded pin 22, and the two force application points of the second torsion spring 20 are respectively on the third protruding screw 19 of the second push block 18 and the fourth protruding screw 24 of the second pawl 25.

[0031] In the ratchet rotating unit, the rotating base 37 and the second slide rail seat 27 are fixed to the base plate 15 by bolt connection, the ratchet pad 38 and the ratchet 3 are installed on the rotating base 37 by a screw combination, the pressure block 2 is installed on the rotating base 37 by the fixing screw 1, the second slider 40 is installed on the two slide rails of the second slide rail seat 27, the spring 26 is installed on the outer slide rail of the second slide rail seat 27, and the ratchet 3 and the second slider 40 are fixedly connected by bolt connection.

[0032] In the working unit, the rotating shaft 39 is fixed to the ratchet 3 by bolt connection, the knob 32 is fixed to the rotating shaft 39 by bolt connection, and the oil injection pipe 31 is installed in the knob 32 .

[0033] In the limiting unit, the limiting fixing block 29 is fixed on the bottom plate 15 by bolt connection, and the limiting screw 28 is installed on the limiting fixing block 29 .

[0034] In the protective cover unit, the front baffle 30, the rear baffle 35, the first side baffle 31, the second side baffle 36 are fixed to the base plate 15 by bolt connection, and the cover plate 34 is installed on the front baffle 30, the rear baffle 35, the first side baffle 31, the second side baffle 36 by bolt connection.

[0035] The motion principle of the present invention: The movements of the first pawl 4 and the second pawl 25 are both driven by the starting cylinder, wherein the first pawl 4 is driven by the first cylinder 14. When the first cylinder 14 extends, it first pushes the first push block 12. The first push block 12 is connected to the first pull block 11 with screws to drive the first pull block 11. The lower part of the first pull block 11 is connected to the first slider of the first slide rail 10 to ensure that the direction of movement is straight. The first pull block 11 is connected to the first pawl 4 by the first non-threaded pin 7, so that the first pawl 4 can rotate around the first non-threaded pin 7, but because the first torsion spring 8 is installed on the first non-threaded pin 7, and the two force application points are respectively on the second protruding screw 9 of the first pull block 11 and the first protruding screw 5 of the first pawl 4. Because the first pull block 11 has been fixed by the first sliding block and cannot rotate, the first torsion spring 8 will cause the first pawl 4 to be subjected to a pressure so that it is firmly stuck on the ratchet below. At this time, because the first cylinder 14 is pushed out to drive the first pull block 11 and then drive the first pawl 4 to move in the direction of the first cylinder 14 extending out, after moving a certain distance, the first pin 6 will contact the cam-like curved surface of the first pawl 4, and continued movement will cause this curved surface to slide along the first pin 6 and then cause the first pawl 4 to rotate away from the ratchet 3. When the rotation reaches a certain degree, the first pawl 4 is separated from the ratchet 3, and the ratchet 3 begins to rotate due to the spring 26 below it until the limit is reached to realize the reset of the ratchet 3. Note: During the resetting process, the second cylinder 16 is in a retracted state. Since the two pawls have similar principles, the second pawl 25 is also in a separated state from the ratchet 3 and will not interfere with the resetting of the ratchet 3.

[0036] The principle of the second cylinder 16 driving the second pawl 25 is similar to that of the first cylinder 14 driving the first pawl 4. The difference is that due to the limiting effect of the third pin 21 on the second push block 18, the overall stroke is shorter, so the requirement for linear motion deviation is also reduced. For cost saving considerations, a slide groove is used here.

[0037] Because the third pin 21 limits the second push block 18, the overall stroke is shorter, so the second cylinder 16 is pushed out to make the second pawl 25 cooperate with the ratchet 3, and then the second cylinder 16 is retracted to make the second pawl 25 pull the ratchet 3 to rotate a certain distance, and then the second pawl 25 is separated from the ratchet 3 due to the second pin 23. In this process, the rotation angle of the ratchet 3 is smaller because the stroke is shorter, and the angle of rotation of the ratchet 3 is fixed by the first pawl 4. Thus, the angle is accumulated to the required angle through multiple cycles. When the current angle is greater than the required angle, the first cylinder 14 is used to separate the ratchet 3 from the first pawl 4 to achieve reset, and then the appropriate angle is accumulated again.

[0038] When the ratchet 3 is reset, its initial angle is determined by the extension length of the limit screw 28 on the limit fixing block 29. Because different machine tools have different minimum extension lengths of the tool handle plus the tool, the extension length of the limit screw 28 can be appropriately adjusted so that it is at the tool tip position of the minimum tool length of the machine tool when reset. This can effectively reduce the angle of idling during each reset and improve the efficiency of angle adjustment.

[0039] The ratchet rotation principle of the present invention: The rotation of the ratchet 3 is achieved by placing the ratchet 3 and the ratchet spacer block on the base with screws, and fixing the base with a pressure block and fixing screws. The angle of the ratchet 3 is transmitted to the knob through the transmission shaft, and the injection pipe passes through the hole of the knob, so that the angle of the ratchet controls the injection angle of the injection pipe.

[0040] The protective cover unit is composed of a base plate 15, a cover plate 34, a first side baffle 31, a second side baffle, a third side baffle 36, a front baffle 30 and a rear baffle 35, and is used to prevent external impurities such as dust, debris, water vapor, etc. from entering the device and affecting the normal movement of components such as the cylinder.

[0041] In addition, the present invention uses program control to obtain the current tool number and then obtain the current tool length based on the tool number. After each tool change, the program is run and the tool length is stored in a fixed variable. The PLC then obtains the tool length to determine how many times each cylinder moves to reach the specified angle.

[0042] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solution described in the implementation of the calculation method of the present invention. Ordinary technicians in the field should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effect; as long as the requirements of the calculation method are met, they are all within the protection scope of the present invention.

Claims

1. A device for automatically adjusting the angle of a fuel injection nozzle according to the change of tool length, characterized in that: The invention comprises a first ratchet pawl movement unit, a second ratchet pawl reset unit, a ratchet wheel rotation unit, a working unit and a limiting unit, wherein the first ratchet pawl movement unit comprises a first cylinder (14) and a first ratchet pawl (4), the second ratchet pawl reset unit comprises a second cylinder (16) and a second ratchet pawl (25), the ratchet wheel rotation unit comprises a rotating base (37), a ratchet wheel (3) and a spring (26), the working unit comprises a rotating shaft (39) and an oil injection pipe, the ratchet wheel (3) is rotatably mounted on the rotating base (37), the spring (26) is connected to the ratchet wheel (3), the spring (26) has a potential energy for pulling the ratchet wheel (3) to an initial position, the limiting unit is used to adjust the initial position of the ratchet wheel (3) and can limit the ratchet wheel (3) to the initial position, the rotating shaft (3 9) is installed on the ratchet (3), and the fuel injection pipe is fixed on the rotating shaft (39). When the ratchet (3) rotates, the rotating shaft (39) moves with it and changes the angle of the fuel injection nozzle of the fuel injection pipe. The first cylinder (14) is connected to the first pawl (4) by transmission. The first cylinder (14) can pull the first pawl (4) into or out of the tooth path of the ratchet (3). The second cylinder (16) is connected to the second pawl (25) by transmission. The second cylinder (16) can pull the second pawl (25) so that the second pawl (25) drives the ratchet (3) to rotate in a direction away from the initial position. When the first pawl (4) enters the tooth path of the ratchet (3), the first pawl (4) can limit the rotation of the ratchet (3) toward the initial position, while not limiting the rotation of the ratchet (3) away from the initial position.

2. The device for automatically adjusting the angle of the fuel injection nozzle according to the change of the tool length according to claim 1 is characterized in that: The invention also comprises a protective cover unit, wherein the protective cover unit comprises a bottom plate (15), a cover plate (34), a first side baffle (31), a second side baffle (36), a front baffle (30) and a rear baffle (35); the bottom plate (15), the cover plate (34), the first side baffle (31), the second side baffle, the third side baffle (36), the front baffle (30) and the rear baffle (35) are enclosed to form a box body; the first ratchet movement unit, the second ratchet reset unit, the ratchet rotation unit, the working unit and the limit unit are installed in the box body; wherein the upper end of the rotating shaft (39) extends from the cover plate (34); and the fuel injection nozzle of the fuel injection pipe is located on the rotating shaft (39) above the cover plate (34).

3. The device for automatically adjusting the angle of the fuel injection nozzle according to the change of the tool length according to claim 2 is characterized in that: The first pawl motion unit further comprises a first slide rail seat (13), a first slide rail (10), a first slider, a first push block (12), a first pull block (11), a first pin (6), a first non-threaded pin (7), a first torsion spring (8), a first protruding screw (5) and a second protruding screw (9); the first slide rail seat (13) is fixed to the base plate (15) by bolt connection, the first cylinder (14) and the first slide rail (10) are fixedly arranged on the first slide rail seat (13), and the first slide rail seat ( The first push block (12) is fixed on the bottom plate (15), the first pin (6) is fixedly mounted on the first slide rail seat (13), the first push block (12) is fixedly connected to the cylinder shaft of the first cylinder (14), the first push block (12) is fixedly connected to the first pull block (11), the first push block (12) is fixed on the first slider, the first slider is slidably mounted on the first slide rail (10), the first pull block (11) is hinged with the first pawl (4) through the first non-threaded pin (7), and the first pawl (4) can rotate around the first The unthreaded pin (7) rotates; the second protruding screw (5) is fixed on the first pawl (4), the first protruding screw (9) is fixed on the first pull block (11), and the first torsion spring (8) is installed on the first unthreaded pin (7). At the same time, the two force application points of the first torsion spring (8) are respectively on the second protruding screw (5) and the first protruding screw (9). The first torsion spring (8) has the potential energy to push the first pawl (4) toward the ratchet (3). When the cylinder shaft of the first cylinder (14) is retracted When the first pawl (4) is pushed out, the tip of the first pawl (4) hooks into the tooth gap of the ratchet wheel (3), restricting the ratchet wheel (3) from rotating toward the initial position, while not restricting the ratchet wheel (3) from rotating away from the initial position. When the cylinder shaft of the first cylinder (14) is pushed out, the first push block (12), the first pull block (11) and the first pawl (4) follow, and the first pin (6) touches the first pawl (4), causing the first pawl (4) to rotate around the first threadless pin (7), and the tip of the first pawl (4) withdraws from the tooth gap of the ratchet wheel (3).

4. The device for automatically adjusting the angle of the fuel injection nozzle according to the change of the tool length according to claim 2 is characterized in that: The second pawl resetting unit further comprises a slide groove (17), a second push block (18), a second pin (23), a third pin (21), a second non-threaded pin (22), a second torsion spring (20), a third protruding screw (19) and a fourth protruding screw (24); the slide groove (17) is fixed on the base plate (15); the second pin (23) is fixed on the base plate (15); the second cylinder (16) is fixed on the slide groove (17); the third pin (21) is fixed on the base plate (15); The second push block (18) is fixed on the slide groove (17), the second push block (18) is fixedly connected to the cylinder shaft of the second cylinder (16), the second push block (18) and the second pawl (25) are hinged through the second non-threaded pin (22), so that the second pawl (25) can rotate around the second non-threaded pin (22), the third protruding screw (19) is fixed on the second push block (18), the fourth protruding screw (24) is fixed on the second pawl (25), and the second torsion spring (20) is installed On the second unthreaded pin (22), two force application points of the second torsion spring (20) are respectively on the third protruding screw (19) and the fourth protruding screw (24); the second torsion spring (20) has potential energy to push the second pawl (25) toward the ratchet (3); when the second cylinder (16) extends to a predetermined position, the third pin (21) can prevent the second cylinder (16) from extending further, and at this time, the tip of the second pawl (25) hooks into the ratchet (3) In the tooth gap at the predetermined position, when the second cylinder (16) retracts, the second cylinder (16) drives the second push block (18) and the second pawl (25) to move, and the second pawl (25) pushes the ratchet wheel (3) in a direction away from the initial position, so that the ratchet wheel (3) rotates. When the second pin (23) touches the second pawl (25), the second pawl (25) rotates around the second non-threaded pin (22), and the tip of the second pawl (25) withdraws from the tooth gap of the ratchet wheel (3).

5. The device for automatically adjusting the angle of the fuel injection nozzle according to the change of the tool length according to claim 2 is characterized in that: The ratchet rotating unit further comprises a ratchet pad (38), a pressure block (2), a second slide rail seat (27) and a second slider (40). The rotating base (37) and the second slide rail seat (27) are fixed on the bottom plate (15). The ratchet pad (38) is rotatably mounted on the rotating base (37). The rotation axis of the ratchet (3) is fixed on the ratchet pad (38). The pressure block (2) is used to press the ratchet (3) so that it cannot move up and down. The second slider (40) is slidably mounted on the slide rail of the second slide rail seat (27). The second slider (40) is fixedly connected to the wheel surface of the ratchet (3). One end of the spring (26) is connected to the ratchet (3), and the other end is connected to the second slide rail seat (27).

6. The device for automatically adjusting the angle of the fuel injection nozzle according to the change of the tool length according to claim 5 is characterized in that: The pressing block (2) is mounted on the rotating base (37) via fixing screws (1).

7. The device for automatically adjusting the angle of the fuel injection nozzle according to the change of the tool length according to claim 2 is characterized in that: The working unit also includes a knob (33), wherein the knob (33) is fixed on the top of the rotating shaft (39), and the knob (33) is used to pass through the fuel injection pipe.

8. The device for automatically adjusting the angle of the fuel injection nozzle according to the change of the tool length according to claim 2 is characterized in that: The limiting unit comprises a limiting fixing block (29) and a limiting screw (28); the limiting fixing block (29) is fixed on the base plate (15), and the limiting screw (28) is installed on the limiting fixing block (29); the end of the limiting screw (28) is used to limit the ratchet (3) and serves as the initial position of the ratchet (3); the limiting screw (28) can adjust the position of the end, thereby changing the initial position of the ratchet (3).

9. The device for automatically adjusting the angle of the fuel injection nozzle according to the change of the tool length according to claim 8, characterized in that: The limit screw (28) passes through the limit fixing block (29) and can move forward and backward in the limit fixing block (29). The oil spray nozzle of the oil spray pipe is used to spray oil to the tool to cool the tool. The tool has various lengths. When the ratchet (3) is in the initial position, the oil spray nozzle of the oil spray pipe just matches the tool with the shortest length.

10. The device for automatically adjusting the angle of a fuel injection nozzle according to the change of tool length according to claim 1, characterized in that: The ventilation of the first cylinder (14) and the second cylinder (16) is controlled by two solenoid valves, and the solenoid valves are controlled by the machine tool.

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