Torque-adjustable pneumatic air screwdriver

Abstract

The utility model discloses a pneumatic air screwdriver with adjustable torque, which relates to the technical field of air screwdrivers and comprises a pneumatic motor, a shell structure mounted outside the pneumatic motor, a force measuring structure mounted at the driving end of the pneumatic motor, a pressurizing structure mounted on the front wall surface of the force measuring structure, and an air valve structure mounted at the tail of the pneumatic motor. The force measuring structure comprises a force measuring bottom plate, a force measuring top frame, a top frame bearing, a top frame supporting plate and a supporting plate bearing; the force measuring bottom plate is fixedly mounted at the driving end of the pneumatic motor, and the force measuring top frame is movably mounted on the front wall surface of the force measuring bottom plate; according to the air screw driver with the two torque adjusting modes, one mode is that the maximum torque value can be adjusted through a mechanical structure, the pneumatic motor in the air screw driver can be protected, and the pneumatic motor can work under the permissible torque, and the other mode is that the power of the pneumatic motor can be adjusted through the mode of adjusting the air inflow, so that the torque of the pneumatic motor can be adjusted. Therefore, the adjusting range of the torque is expanded.

Description

Technical Field

[0001] The utility model relates to the technical field of air screwdrivers, in particular to a moment-adjustable pneumatic air screwdriver. Background Art

[0002] A pneumatic screwdriver, also known as a pneumatic screwdriver, is a commonly used pneumatic tool used to tighten and loosen screws and nuts. The pneumatic screwdriver uses compressed air as power to operate. Due to its high speed, high efficiency and low temperature rise, the pneumatic screwdriver has become an indispensable tool in the assembly industry. The pneumatic screwdriver head is the blade head on the pneumatic screwdriver.

[0003] Most of the current pneumatic screwdrivers use a fixed torque method, but when assembling different bolts, different maximum torques are required, so different types of torques need to be prepared. Most pneumatic screwdrivers also use the method of adjusting the air intake to adjust the power of the pneumatic motor in the pneumatic screwdriver, thereby completing the adjustment of the pneumatic screwdriver torque. However, this method of adjusting the air intake cannot accurately adjust the torque of the pneumatic motor. When the air intake is too large and greater than the maximum load of the pneumatic motor, it will cause damage to the pneumatic motor. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a torque-adjustable pneumatic air screwdriver. The utility model has two torque adjustment methods. One is to adjust the maximum torque value through a mechanical structure, which can protect the pneumatic motor in the air screwdriver and allow the pneumatic motor to work under the allowed torque. The other is to adjust the power of the pneumatic motor by adjusting the air intake, thereby expanding the torque adjustment range of the utility model.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A torque-adjustable pneumatic air screwdriver comprises: a pneumatic motor, a shell structure is installed on the outside of the pneumatic motor, a force measuring structure is installed on the driving end of the pneumatic motor, a pressurizing structure is installed on the front wall of the force measuring structure, and an air valve structure is installed on the tail of the pneumatic motor; the force measuring structure comprises: a force measuring base plate, a force measuring top frame, a top frame bearing, a top frame support plate and a support plate bearing; the force measuring base plate is fixedly installed on the driving end of the pneumatic motor, the force measuring top frame is movably installed on the front wall of the force measuring base plate, the top frame bearing is fixedly mounted on the outside of the force measuring top frame, the top frame support plate is movably mounted on the outside of the force measuring top frame, and the support plate bearing is mounted on the outside of the top frame support plate.

[0007] The utility model is further configured such that the pressurizing structure includes: two turntables and a pressurizing spring; one of the turntables is mounted on the front wall of the force measuring top frame, one end of the pressurizing spring is mounted on the side wall of the turntable, and the other turntable is mounted on the other end of the pressurizing spring.

[0008] The utility model is further configured such that the shell structure includes: a main shell, a bracket shell and a pressurized shell; the main shell is sleeved on the outside of the pneumatic motor, the bracket shell is sleeved on the outside of the top frame bearing and the support plate bearing, and the pressurized shell is sleeved on the outside of the bracket shell through a threaded movement.

[0009] The utility model is further configured that the air valve structure comprises: an air pipe and an adjustable air valve; one end of the air pipe is installed at the tail of the pneumatic motor, and the adjustable air valve is sleeved on the outside of the air pipe.

[0010] The utility model is further configured that a tool shaft is installed on the front wall surface of the force measuring top frame.

[0011] The utility model is further configured that a start button is installed on the upper wall surface of the main body shell.

[0012] The utility model is further configured that the force measuring bottom plate is provided with a plurality of circular pits, and the circular pits of the force measuring bottom plate can correspond to the top pins of the force measuring top frame.

[0013] The beneficial effects of the utility model are as follows: the utility model has an air screwdriver with two torque adjustment methods, one of which is to adjust the maximum torque value through a mechanical structure, thereby protecting the pneumatic motor in the air screwdriver and allowing the pneumatic motor to work under an allowable torque, and the other is to adjust the power of the pneumatic motor by adjusting the air intake volume, thereby expanding the torque adjustment range of the utility model.

[0014] 1. The torque-adjustable pneumatic air screwdriver is equipped with a force measuring structure, which can adjust the maximum torque allowed by the pneumatic motor from a mechanical structure. When the torque is too large, the force measuring structure will be unloaded and idle to avoid overloading of the pneumatic motor.

[0015] 2. The torque-adjustable pneumatic air screwdriver is provided with an air valve structure, which can adjust the air intake of the utility model, thereby adjusting the maximum power of the pneumatic motor, and adjusting the maximum torque that the pneumatic motor can bear from the perspective of the pneumatic motor.

[0016] 3. The torque-adjustable pneumatic air screwdriver is provided with a pressurizing structure, which can adjust the maximum torque peak value borne by the force measuring structure, thereby ensuring the safe operation of the pneumatic motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic diagram of the overall external structure of a torque-adjustable pneumatic screwdriver proposed by the utility model;

[0018] Figure 2 This is a schematic diagram of the overall internal structure of a torque-adjustable pneumatic air screwdriver proposed by the utility model;

[0019] Figure 3 This is a schematic diagram of the internal partial structure of a torque-adjustable pneumatic air screwdriver proposed by the utility model;

[0020] Figure 4 The utility model is a schematic diagram of the internal partial explosion structure of a torque-adjustable pneumatic air hammer.

[0021] In the figure: 1. pneumatic motor; 2. force measuring base plate; 3. force measuring top frame; 4. top frame bearing; 5. top frame support plate; 6. support plate bearing; 7. turntable; 8. pressurized spring; 9. main body shell; 10. bracket shell; 11. pressurized shell; 12. air pipe; 13. adjustable air valve; 14. tool shaft; 15. start button. DETAILED DESCRIPTION

[0022] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0025] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0026] Reference Figure 1-4A torque-adjustable pneumatic air screwdriver comprises: a pneumatic motor 1, a shell structure is installed on the outside of the pneumatic motor 1, a force measuring structure is installed on the driving end of the pneumatic motor 1, a pressurizing structure is installed on the front wall of the force measuring structure, and a valve structure is installed on the tail of the pneumatic motor 1; the force measuring structure comprises: a force measuring bottom plate 2, a force measuring top frame 3, a top frame bearing 4, a top frame support plate 5 and a support plate bearing 6; the force measuring bottom plate 2 is fixedly installed on the driving end of the pneumatic motor 1, the force measuring top frame 3 is movably installed on the front wall of the force measuring bottom plate 2, and the top frame shaft The bearing 4 is fixedly mounted on the outside of the force measuring frame 3, the frame support plate 5 is movably mounted on the outside of the force measuring frame 3, the support plate bearing 6 is mounted on the outside of the frame support plate 5, the front wall of the force measuring frame 3 is installed with a tool shaft 14, the force measuring base plate 2 is provided with a plurality of circular pits, and the circular pits of the force measuring base plate 2 can correspond to the top needles of the force measuring frame 3. The force measuring structure can adjust the maximum torque allowed by the pneumatic motor 1 from the mechanical structure. When the torque is too large, the force measuring structure will be unloaded and idle to avoid overloading of the pneumatic motor 1.

[0027] Specifically, the pressurizing structure includes: two turntables 7 and a pressurizing spring 8; one turntable 7 is installed on the front wall of the force measuring frame 3, one end of the pressurizing spring 8 is installed on the side wall of the turntable 7, and the other turntable 7 is installed on the other end of the pressurizing spring 8. The pressurizing structure can adjust the maximum torque peak value that the force measuring structure can withstand, thereby ensuring the safe operation of the pneumatic motor 1.

[0028] Specifically, the air valve structure includes: an air pipe 12 and an adjustable air valve 13; one end of the air pipe 12 is installed at the tail of the pneumatic motor 1, and the adjustable air valve 13 is mounted on the outside of the air pipe 12. The air valve structure can adjust the air intake volume of the utility model, thereby adjusting the maximum power of the pneumatic motor 1, and adjusting the maximum torque that the pneumatic motor 1 can bear from the perspective of the pneumatic motor 1.

[0029] Specifically, the shell structure includes: a main shell 9, a bracket shell 10 and a pressurized shell 11; the main shell 9 is mounted on the outside of the pneumatic motor 1, the bracket shell 10 is mounted on the outside of the top frame bearing 4 and the support plate bearing 6, the pressurized shell 11 is mounted on the outside of the bracket shell 10 through a threaded movement, and a start button 15 is installed on the upper wall of the main shell 9.

[0030] Working principle: When using the utility model, first connect the external air source to the utility model and connect it to the air pipe 12 to provide energy for the rotation of the pneumatic motor 1, and the air intake of the air pipe 12 can be adjusted through the adjustable air valve 13. When using the utility model, the operator presses the start button 15 to start the pneumatic motor 1, which drives the force measuring base plate 2 to rotate, and drives the force measuring top frame 3 to rotate through the friction force, that is, drives the tool shaft 14 to rotate. At this time, the rotating tool shaft 14 can rotate the bolt. When the bolt is installed to the bottom, the friction between the force measuring base plate 2 and the force measuring top frame 3 is less than the torque of the tool shaft 14, and the force measuring base plate 2 and the force measuring top frame 3 are in air contact. Rotation, thereby avoiding damage to the pneumatic motor 1 caused by excessive torque on the pneumatic motor 1. The operator can increase the maximum torque by rotating the pressurized shell 11. Rotating the pressurized shell 11 can compress the pressurized spring 8 under the action of the thread, thereby increasing the pressure of the force measuring top frame 3 on the force measuring base plate 2. According to the friction formula, the friction force is equal to the product of the friction coefficient and the positive pressure. At this time, the positive pressure between the force measuring base plate 2 and the force measuring top frame 3 is increased. Therefore, the torque that the pneumatic motor 1 can drive can become larger, thereby completing the adjustment of the torque. At the same time, the operator can adjust the air intake through the adjustable air valve 13, and adjust the rotational power of the pneumatic motor 1 from the source, thereby adjusting the peak value of the maximum torque that the pneumatic motor 1 can drive.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A torque-adjustable pneumatic screwdriver, comprising: A pneumatic motor (1), characterized in that a housing structure is installed on the outside of the pneumatic motor (1), a force measuring structure is installed on the driving end of the pneumatic motor (1), a pressurizing structure is installed on the front wall of the force measuring structure, and a valve structure is installed at the tail of the pneumatic motor (1); The force measuring structure comprises: a force measuring bottom plate (2), a force measuring top frame (3), a top frame bearing (4), a top frame support plate (5) and a support plate bearing (6); The force measuring base plate (2) is fixedly mounted on the driving end of the pneumatic motor (1), the force measuring top frame (3) is movably mounted on the front wall of the force measuring base plate (2), the top frame bearing (4) is fixedly sleeved on the outside of the force measuring top frame (3), the top frame support plate (5) is movably sleeved on the outside of the force measuring top frame (3), and the support plate bearing (6) is sleeved on the outside of the top frame support plate (5).

2. The torque-adjustable pneumatic screwdriver according to claim 1, characterized in that: The pressurizing structure comprises: two rotating disks (7) and a pressurizing spring (8); One of the turntables (7) is mounted on the front wall of the force measuring top frame (3), one end of the pressure spring (8) is mounted on the side wall of the turntable (7), and the other turntable (7) is mounted on the other end of the pressure spring (8).

3. The torque-adjustable pneumatic screwdriver according to claim 1 is characterized in that: The shell structure comprises: a main shell (9), a support shell (10) and a pressurized shell (11); The main body shell (9) is sleeved on the outside of the pneumatic motor (1), the bracket shell (10) is sleeved on the outside of the top frame bearing (4) and the support plate bearing (6), and the pressurized shell (11) is sleeved on the outside of the bracket shell (10) through a threaded movement.

4. The torque-adjustable pneumatic screwdriver according to claim 1, characterized in that: The air valve structure comprises: an air pipe (12) and an adjustable air valve (13); One end of the air pipe (12) is mounted on the tail of the pneumatic motor (1), and the adjustable air valve (13) is sleeved on the outside of the air pipe (12).

5. The torque-adjustable pneumatic screwdriver according to claim 1, characterized in that: A tool shaft (14) is installed on the front wall surface of the force measuring top frame (3).

6. The torque-adjustable pneumatic screwdriver according to claim 3 is characterized in that: A start button (15) is installed on the upper wall surface of the main body shell (9).

7. The torque-adjustable pneumatic screwdriver according to claim 1, characterized in that: The force measuring bottom plate (2) is provided with a plurality of circular pits, and the circular pits of the force measuring bottom plate (2) can correspond to the top pins of the force measuring top frame (3).

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