A device for automatically adjusting the angle of the oil nozzle according to the change of the length of the cutter

Abstract

The present application relates to a kind of automatic adjustment oil nozzle angle device according to the change of tool length, belong to the technical field of machining cooling.The first pawl movement unit of device includes first cylinder and first pawl, the second pawl reset unit includes second cylinder and second pawl, the ratchet wheel rotation unit includes rotating base, ratchet wheel and spring, and working unit includes rotating shaft and oil injection pipe, ratchet wheel is rotatably installed on rotating base, spring is connected with ratchet wheel, spring has the potential energy of ratchet wheel to initial position, first cylinder is drivingly connected with first pawl, first cylinder can drag first pawl to enter or exit the gear path of ratchet wheel, second cylinder is drivingly connected with second pawl, and second cylinder can drag second pawl to make second pawl rotate ratchet wheel to the direction of deviating from initial position.The present application can automatically identify tool tip position, and adjust the angle of projection according to the change of tool length, ensure that cutting fluid can be accurately sprayed to tool tip position, to reduce the risk of broken tool, reduce tool replacement frequency and cost, improve workpiece surface processing quality and processing efficiency.

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 utilize precise numerical control technology to achieve efficient, high-precision machining of workpieces. However, during machining, friction and heat generated by cutting can rapidly increase the temperature of the tool and workpiece, posing a serious threat to machining quality and tool life. To address this issue, cutting fluids are widely used. Cutting fluids' primary functions include cooling, lubrication, cleaning, and rust prevention, with cooling being particularly critical. By effectively reducing the temperature in the cutting zone, cutting fluids protect the tool and workpiece from heat damage, thereby improving machining accuracy and extending tool life. However, tool length variation is a significant concern in CNC machining. Traditional CNC machine tool cutting fluid injection systems often utilize fixed-position nozzles, which are unable to automatically adjust the injection angle based on tool length variations. When tool length changes, the nozzle may not accurately spray the cutting fluid at the tool tip, preventing the cutting fluid from fully achieving its cooling effect. This can lead to excessive tool and workpiece temperatures, accelerating tool wear and damage, reducing machining accuracy and surface quality, and even causing machine tool failure and interruption. Currently, the main methods for adjusting the nozzle angle based on tool length variations include manual adjustment and stepper motor adjustment. Manual adjustment reduces machine tool utilization; motor adjustment requires the installation of a complete drive control system and communication system, which is costly. Furthermore, motor adjustment requires connecting wires to the nozzle angle adjustment device. Installing wires in areas exposed to oil and where conductive steel is predominantly used presents a 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:

[0005] A device for automatically adjusting the angle of an oil injection nozzle according to changes in tool length includes a motion unit for a first pawl, a reset unit for a second pawl, a ratchet rotation unit, a working unit, and a limiting unit. The motion unit for the first pawl includes a first cylinder and a first pawl, the reset unit for the second pawl includes a second cylinder and a second pawl, the ratchet rotation unit includes a rotating base, a ratchet, and a spring, the working unit includes a rotating shaft and an oil injection pipe, the ratchet is rotatably mounted on the rotating base, the spring is connected to the ratchet, and the spring has potential energy to pull the ratchet to an initial position, and the limiting unit is used to adjust the initial position of the ratchet. The ratchet can be limited to an initial position. The rotating shaft is installed on the ratchet, and the fuel injection pipe is fixed on the rotating shaft. When the ratchet rotates, the rotating shaft moves with it and changes the angle of the fuel nozzle of the fuel injection pipe. The first cylinder is connected to the first pawl for transmission. 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 for transmission. The second cylinder can pull the second pawl so that the second pawl drives 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.

[0006] To optimize the above technical solutions, specific measures taken also include:

[0007] 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 motion unit of the first pawl, the reset unit of the second pawl, 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.

[0008] The motion unit of the first pawl 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 unthreaded 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 with a 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 unthreaded pin, and the first pawl can rotate around the first unthreaded 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 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.

[0009] The reset unit of the second pawl also includes a slide groove, a second push block, a second pin, a third pin, a second unthreaded pin, a second torsion spring, a third protruding screw and a fourth protruding screw. The slide groove is fixed on the base plate, the second pin is fixed on the base plate, the second cylinder is fixed on the slide groove, the third pin is fixed on the slide groove, 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 unthreaded pin, so that the second pawl can rotate around the second unthreaded pin, the third protruding screw is fixed on the second push block, the fourth protruding screw is fixed on the second pawl, and the second torsion spring is installed on the second unthreaded 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 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.

[0010] The ratchet rotation 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 to the base plate. The ratchet pad can be rotatably mounted 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 mounted 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.

[0011] The pressing block is mounted on the rotating base by fixing screws.

[0012] The working unit also includes a knob, which is fixed on the top of the rotating shaft and is used to pass through the oil injection pipe.

[0013] The limiting unit includes a limiting fixing block and a limiting screw. The limiting fixing block is fixed on the base plate, and the limiting screw is installed on the limiting fixing block. The end of the limiting screw is used to limit the ratchet and serves as the initial position of the ratchet. The limiting screw can adjust the position of the end, thereby changing the initial position of the ratchet.

[0014] The limit screw passes through the limit fixing block and can move back and forth in the limit fixing block. The oil 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 is in the initial position, the oil nozzle of the oil spray pipe just matches the shortest length tool.

[0015] The ventilation of the first cylinder and the second cylinder is controlled by two solenoid valves, which are controlled by the machine tool.

[0016] The beneficial effects of the present invention are:

[0017] The device of the present invention automatically adjusts the angle of the oil nozzle according to the change of the tool length, can adjust the injection angle according to the change of the tool length, and 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.

[0018] When adjusting the angle of the fuel injector, the present invention uses two cylinders as the power source. The cylinder is pneumatically driven instead of motor driven. The advantages are that no wiring is required, the structure is easier to install, and it is more effective 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 cylinder is 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

[0019] Figure 1 This is a schematic diagram of a device for automatically adjusting the angle of a fuel injection nozzle according to changes in tool length according to an embodiment of the present invention.

[0020] Figure 2The internal structure of the device for automatically adjusting the angle of the oil injection nozzle according to the change of the length of the tool is shown.

[0021] Figure 3 The cooperation diagram of the second push block and the sliding groove of the device for automatically adjusting the angle of the oil injection nozzle according to the change of the length of the tool is shown.

[0022] Figure 4 The schematic diagram of the ratchet wheel rotating unit and the working unit of the device for automatically adjusting the angle of the oil injection nozzle according to the change of the length of the tool is shown.

[0023] The reference signs are as follows: 1-fixed screw, 2-pressing block, 3-ratchet wheel, 4-first pawl, 5-first protruding screw, 6-first pin, 7-first unthreaded pin, 8-first torsion spring, 9-second protruding screw, 10-first sliding rail, 11-first pulling block, 12-first push block, 13-first sliding rail seat, 14-first air cylinder, 15-bottom plate, 16-second air cylinder, 17-sliding groove, 18-second push block, 19-third protruding screw, 20-second torsion spring, 21-third pin, 22-second unthreaded pin, 23-second pin, 24-fourth protruding screw, 25-second pawl, 26-spring, 27-second sliding rail seat, 28-limiting screw, 29-limiting fixed block, 30-front baffle, 31-first side baffle, 32-oil injection nozzle, 33-knob, 34-cover plate, 35-rear baffle, 36-third side baffle, 37-rotating base, 38-ratchet wheel pad, 39-rotating shaft, 40-second sliding block. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present application more clear and understandable, the present application is described and explained below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0025] Obviously, the drawings in the following description are only some examples or embodiments of the present application, and for those of ordinary skill in the art, the present application can also be applied to other similar scenarios without creative labor on the basis of these drawings. In addition, it can be understood that although the efforts made in this development process can be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacture or production changes based on the technical content disclosed in the present application are only routine technical means and should not be understood as insufficient disclosure of the present application.

[0026] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments unless there is a conflict.

[0027] Unless otherwise defined, the technical or scientific terms used in this application should have the ordinary meaning understood by a person of ordinary skill in the technical field to which this application belongs. The words "a", "an", "a", "the" and the like used in this application do not indicate a limit on quantity and may indicate the singular or plural. The terms "include", "comprise", "have" and any variations thereof used 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 that are inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The words "multiple" / "several" used in this application refer to two or more. "And / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, or 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 order for the objects.

[0028] The purpose of the present invention is to provide a device that automatically adjusts the angle of the oil nozzle according to the change of the tool length. It 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.

[0029] Figure 1 This is a schematic diagram of a device for automatically adjusting the angle of a fuel injection nozzle according to changes 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 tool length according to an embodiment of the present invention. Figure 3 This is a diagram showing the coordination between the second push block and the slide groove of a device for automatically adjusting the angle of a fuel injection nozzle according to changes in tool length according to an embodiment of the present invention. Figure 4This is a schematic diagram of a ratchet rotation 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. The device includes:

[0030] A device for automatically adjusting the angle of a fuel injection nozzle according to changes in tool length, the processing device comprising:

[0031] A moving unit of the first pawl, a resetting unit of the second pawl, a ratchet rotation unit, a working unit, a limiting unit and a protective cover unit.

[0032] Among them, the motion unit of the first pawl 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 unthreaded pin 7, a first torsion spring 8, a first protruding screw 5 and a second protruding screw 9.

[0033] The reset unit of the second pawl includes: a second cylinder 16 , a sliding groove 17 , a second push block 18 , a second pawl 25 , a second pin 23 , a third pin 21 , a second unthreaded pin 22 , a second torsion spring 20 , a third protruding screw 19 and a fourth protruding screw 24 .

[0034] The ratchet rotating unit includes: a rotating base 37 , a ratchet spacer 38 , a pressure block 2 , a fixing screw 1 , a second slide rail seat 27 , a second slider 40 , a spring 26 , and a ratchet 3 .

[0035] The working unit includes a rotating shaft 39 , a knob 32 and an oil injection pipe 31 .

[0036] The limiting unit includes: a limiting fixing block 29 and a limiting screw 28 .

[0037] The protective cover unit includes a bottom plate 15 , a cover plate 34 , a first side guard plate 31 , a second side guard plate 36 , a third side guard plate 36 , a front guard plate 30 and a rear guard plate 35 .

[0038] In the motion unit of the first pawl, 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 on 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 a first unthreaded pin 7 to enable the first pawl 4 to rotate around the first unthreaded pin 7; the first torsion spring 8 is installed on the first unthreaded 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 firmly clamps the ratchet 3.

[0039] In the reset unit of the second pawl, 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 and the second cylinder 16 are fixed by threaded connection, and the second push block 18 and the second pawl 25 are connected by a second non-threaded pin 22 to enable the second pawl 25 to rotate 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.

[0040] 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 bolts.

[0041] 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 .

[0042] In the limiting unit, the limiting fixing block 29 is fixed to the base plate 15 by bolt connection, and the limiting screw 28 is installed on the limiting fixing block 29 .

[0043] 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 bolts, 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 and the third side baffle 36 by bolts.

[0044] The motion principle of the present invention:

[0045] 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 and then drives the first pull block 11. The bottom 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 and the first pawl 4 are connected by the first unthreaded pin 7, so that the first pawl 4 can rotate around the first unthreaded pin 7, but because the first torsion spring 8 is installed on the first unthreaded 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 is fixed by the first slider 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 extending the first cylinder 14, after moving a certain distance, the first pin 6 will contact the cam-like curved surface of the first pawl 4. Continuing to move will cause this curved surface to slide along the first pin 6, thereby causing 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 operate in a similar manner, the second pawl 25 is also separated from the ratchet 3 and does not interfere with the resetting of the ratchet 3.

[0046] 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.

[0047] 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 distance, and then the second pawl 25 is separated from the ratchet 3 due to the second pin 23. Because the stroke is short in this process, the rotation angle of the ratchet 3 is small, and the angle of rotation of the ratchet 3 is fixed by the first pawl 4. 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.

[0048] 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 tool handle plus tool extension lengths, appropriately adjusting the extension length of the limit screw 28 so that it is at the tool tip position of the minimum tool length of the machine tool when reset can effectively reduce the angle of idling during each reset and improve the efficiency of angle adjustment.

[0049] The ratchet rotation principle of the present invention:

[0050] The ratchet 3 rotates by screwing the ratchet 3 and ratchet spacer onto the base, using the rotating base as the axis. The base is then secured with a pressure block and set screws. The angle of the ratchet 3 is transmitted to the knob via a drive shaft. The nozzle passes through the hole in the knob, allowing the nozzle's spray angle to be controlled by the angle of the ratchet.

[0051] The protective cover unit consists 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.

[0052] 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.

[0053] It is understandable 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 this field should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the requirements of the calculation method are met, they are within the scope of protection of the present invention.

Claims

1. A device for automatically adjusting the angle of a fuel injection nozzle according to changes in tool length, characterized by: The invention comprises a motion unit of a first pawl, a reset unit of a second pawl, a ratchet rotation unit, a working unit and a limiting unit, wherein the motion unit of the first pawl comprises a first cylinder (14) and a first pawl (4), the reset unit of the second pawl comprises a second cylinder (16) and a second pawl (25), the ratchet rotation unit comprises a rotating base (37), a ratchet (3) and a spring (26), the working unit comprises a rotating shaft (39) and an oil injection pipe, the ratchet (3) is rotatably mounted on the rotating base (37), the spring (26) is connected to the ratchet (3), the spring (26) has potential energy for pulling the ratchet (3) to an initial position, and the limiting unit is used to adjust the ratchet (3) and can limit the ratchet (3) to the initial position, the rotating shaft (39) is installed on the ratchet (3), and the injection pipe is fixed on the rotating shaft (39). When the ratchet (3) rotates, the rotating shaft (39) follows and changes the injection nozzle angle of the injection pipe. The first cylinder (14) is connected to the first pawl (4) in a transmission manner, and 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) in a transmission manner, and 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 a 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. The automatic nozzle angle adjustment device also includes a protective cover unit, the protective cover unit includes a base plate (15), the reset unit of the second pawl also includes 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 (1 6) is fixed on the slide groove (17), the third pin (21) 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 unthreaded pin (22), so that the second pawl (25) can rotate around the second unthreaded 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), the second torsion spring (20) is installed on the second unthreaded pin (22), and the 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 the 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 continuing to extend. At this time, the tip of the second pawl (25) hooks into the tooth gap of the ratchet (3) at a 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. The second pawl (25) moves the ratchet (3) away from the initial position, causing the ratchet (3) to rotate. When the second pin (23) touches the second pawl (25), the second pawl (25) rotates around the second unthreaded pin (22), and the tip of the second pawl (25) withdraws from the tooth gap of the ratchet (3).

2. The device for automatically adjusting the angle of a fuel injection nozzle according to a change in tool length according to claim 1, characterized in that: The protective cover unit further comprises 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); 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; a moving unit of the first pawl, a reset unit of the second pawl, a ratchet rotation unit, a working unit and a limiting 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 a fuel injection nozzle according to a change in tool length according to claim 2, characterized in that: The motion unit of the first pawl 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 threadless 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 (13) is fixed on the bottom plate (15), the first pin (6) is fixed 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 installed on the first slide rail (10), the first pull block (11) and the first pawl (4) are hinged by the first non-threaded pin (7), and the first pawl (4) can rotate around the first A threadless pin (7) rotates; a first protruding screw (5) is fixed on the first pawl (4), a second protruding screw (9) is fixed on the first pull block (11), a first torsion spring (8) is installed on the first threadless pin (7), and two force application points of the first torsion spring (8) are respectively on the first protruding screw (5) and the second protruding screw (9), and the first torsion spring (8) has potential energy to push the first pawl (4) toward the ratchet (3). When the cylinder shaft of the first cylinder (14) is retracted, the first torsion spring (8) is rotated; a first protruding screw (5) is fixed on the first pawl (4), and a second protruding screw (9) is fixed on the first pull block (11). When returning, the tip of the first pawl (4) hooks into the tooth gap of the ratchet (3), restricting the ratchet (3) from rotating toward the initial position, while not restricting the ratchet (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 unthreaded pin (7), and the tip of the first pawl (4) withdraws from the tooth gap of the ratchet (3).

4. The device for automatically adjusting the angle of a fuel injection nozzle according to a change in tool length according to claim 2, wherein: The ratchet rotation unit further comprises a ratchet pad (38), a pressure block (2), a second slide rail seat (27) and a second slider (40), wherein 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).

5. The device for automatically adjusting the angle of a fuel injection nozzle according to a change in tool length according to claim 4, characterized in that: The pressing block (2) is mounted on the rotating base (37) via fixing screws (1).

6. The device for automatically adjusting the angle of a fuel injection nozzle according to a change in tool length according to claim 2, wherein: The working unit further comprises 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 oil injection pipe.

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

8. The device for automatically adjusting the angle of a fuel injection nozzle according to a change in tool length according to claim 7, 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 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 nozzle of the oil spray pipe just matches the tool with the shortest length.

9. The device for automatically adjusting the angle of a fuel injection nozzle according to a change in 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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