Pneumatic cutter and leather cutting machine

Abstract

The utility model relates to the field of leather cutting devices, in particular to a pneumatic cutter and a leather cutting machine, which comprise a body provided with a reciprocating device for driving a cutter to move back and forth, and are characterized in that the reciprocating device is arranged in a gas flow channel in the body, and a limiting structure close to the reciprocating device is further arranged in the gas flow channel. The maximum stroke in the back-and-forth direction is restrained; the purpose of rapid cutting is achieved in a pneumatic mode, in the reciprocating motion process, the limiting structure restrains the reciprocating device to have more displacement changes, the reciprocating device can reach the maximum stroke value more rapidly, and in short, the number of times of completing reciprocating motion in unit time is increased due to rising of the motion frequency.

Description

Technical Field

[0001] The utility model relates to the field of leather cutting devices, in particular to a pneumatic knife and a leather cutting machine. Background Art

[0002] Pneumatic knife, a pneumatically driven knife head that cuts corresponding shapes on the leather.

[0003] Conventional pneumatic knives, such as the one named as patent number 202120142922.1, have the biggest feature of noise reduction effect. The improvement of quietness can reduce the impact on operators.

[0004] However, the frequency of this pneumatic knife is 1.3~1.5Wr / min, and it cannot cut certain leather materials, and may cause wire drawing and sawtooth. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a pneumatic knife, which solves the problem of continuous cutting by accelerating the internal air exchange frequency and thus the up and down frequency of the piston.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a pneumatic knife, comprising a main body, the main body having a reciprocating device that enables the cutting knife to move back and forth, characterized in that the reciprocating device is arranged in a gas flow channel inside the main body, and a limiting structure close to the reciprocating device is also provided in the gas flow channel to constrain the maximum stroke in the reciprocating direction.

[0007] Furthermore, the limiting structures are distributed in the reciprocating direction of the reciprocating device.

[0008] Furthermore, a step is provided in the gas flow channel, and the limiting structure has a shape matching the step, and is fixed in the gas flow channel in cooperation with the step.

[0009] Furthermore, the limiting structure is a limiting glue.

[0010] Furthermore, a feedback passage and a valve core are provided inside the main body. The reciprocating device divides the gas flow path into a first part and a second part which are independent of each other. The feedback passage corresponds to the second part. The negative pressure gas flow formed when the reciprocating device moves flows through the feedback passage into the valve core provided in the first part, pushing the valve core to close the gas flow path.

[0011] Furthermore, a cavity is provided in the body, and the cavity and the gas flow channel are kept connected. The valve core is arranged in the cavity and has a clearance fit with the cavity. The feedback passage is connected to the cavity, and pressure is applied to the valve core to cut off the flow of compressed air on the gas flow channel.

[0012] Furthermore, the area in the body corresponding to the reciprocating device is composed of a reversing sleeve and a reversing cover. The reversing sleeve is sealed on the surface of the reversing cover. The reversing sleeve is a hollow structure with upper and lower openings. The surface of the reversing cover is also provided with an opening structure. The compressed air flow enters the interior of the reversing sleeve from the opening structure. The combination of the reversing cover and the reversing sleeve is used to provide a normal space required for the activity of the reciprocating device. In addition, the lower part of the valve core is supported by the reversing cover. Under its own gravity, the valve core closes the opening structure of the reversing cover.

[0013] Furthermore, the reciprocating device is a plug rod with a piston.

[0014] Furthermore, an annular groove is provided on the circumferential surface of the upper part of the valve core, and the annular groove corresponds to the feedback passage.

[0015] A leather cutting machine comprises the above-mentioned pneumatic knife and can quickly cut leather.

[0016] Beneficial effects of the utility model:

[0017] The utility model realizes the purpose of rapid cutting by pneumatic means. During the reciprocating motion, the limiting structure constrains the reciprocating device to have more displacement changes, so that the reciprocating device reaches the maximum stroke value faster. In short, the increase of the motion frequency leads to more times of reciprocating motion completed in unit time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a stereogram of the utility model.

[0019] Figure 2 It is a cross-sectional view of the utility model.

[0020] Figure 3 is a cross-sectional view of the shunt block.

[0021] Figure 4 It is a three-dimensional diagram of the plug rod.

[0022] Figure 5 It is a three-dimensional picture of the race pole.

[0023] Figure 6 This is the connection diagram between the diverter block and the valve core.

[0024] Figure 7 This is a cross-sectional view of the valve core after it is assembled into the diverter block.

[0025] Figure 8 yes Figure 7 Another perspective view.

[0026] Fig. 9 yes Figure 8 Sectional view at point A.

[0027] Fig.10 It is a three-dimensional diagram of the reversing cover sealed on the reversing sleeve. DETAILED DESCRIPTION

[0028] In the specification, references to "one embodiment", "an embodiment" or "some embodiments" mean that a particular feature, structure or element described with reference to the embodiment is included in at least one embodiment of the subject matter being described. Thus, sentences in the specification saying "in one embodiment" or "in an embodiment" or "in some embodiments" do not necessarily refer to the same embodiment or embodiments. The particular features, structures or elements may be further combined in any embodiment in a suitable manner.

[0029] A leather cutting machine, comprising a pneumatic knife (such as Figure 1-10 As shown in FIG. 1 , it is a pneumatic tool for working on leather. The pneumatic knife comprises a main body 1, which has a gas flow channel, a cavity 2a, a reciprocating device, and a cutting knife 4. Figure 2 It is a cross-sectional view of the utility model. Figure 2 The arrows show the flow path of the compressed air flow in the gas flow channel. It can be seen from the figure that the cavity 2a is close to the gas flow channel, the valve core 3 installed in the cavity 2a is movable, the area corresponding to the gas flow channel and the valve core 3 is an opening, and the valve core 3 partially falls into the gas flow channel under its own gravity. The reciprocating device is located below the valve core 3, and the cutter 4 is installed at the lower end of the reciprocating device. The reciprocating device is in the gas flow channel, and its interior is divided into a first part and a second part that are independent of each other. The inner wall of the second part has a feedback passage 5, and the feedback passage 5 is connected to the cavity 2a. The air intake shaft 6 is located above the body 1. After the compressed air flow is introduced into the air intake shaft 6, the compressed air flow passes through the divider The flow block 2 lifts the valve core 3 and opens the gas flow channel. The compressed air flow pushes the reciprocating device to move downward, driving the cutter 4 to penetrate the leather. During cutting, the reciprocating device squeezes the gas inside the second part, and the gas enters the cavity 2a through the feedback passage 5, exerting pressure on the lifted valve core 3, causing the valve core 3 to intercept the compressed air, and the reciprocating device is reset, so that the cutter head leaves the leather. The reciprocating device is a plug rod 7, and the plug rod 7 has a piston 7a with an arched middle area. The compressed air flow will impact the middle area of ​​the piston 7a, causing the middle area to deform in the opposite direction, pushing out or squeezing out the air in the second part. After losing the compressed air flow, the middle area of ​​the piston 7a is reset.

[0030] It can be seen that the piston 7a used in the utility model will prepare a new round of compressed airflow under the action of the compressed airflow of the power source, and the compressed airflow serves as the trigger threshold for controlling the valve core 3 to cut off the flow: the compressed airflow enters the cavity 2a through the feedback passage 5, so that the air pressure inside the cavity 2a expands, pushing the valve core 3 to move into the gas flow channel, thereby achieving the purpose of cutting off the flow.

[0031] At present, in actual use, the frequency of the pneumatic knife can reach between 2Wr / min-2.4Wr / min.

[0032] It should be noted that this leather cutting machine uses intermittent compressed air flow to the air inlet shaft 6. In the case of high-frequency air flow, the cutter 4 performs a uniform reciprocating motion.

[0033] In the embodiment, an annular groove 31 is provided on the circumference of the upper portion of the valve core 3 , and the annular groove 31 corresponds to the feedback passage 5 .

[0034] The cavity 2a is the interior of the diverter block 2 that constitutes the gas flow channel. The diverter block 2 is also provided with a first channel 21 that serves as the gas flow channel. The first channel 21 is connected from top to bottom at the lower end of the cavity 2a. The valve core 3 has a gap D1 in the cavity 2a. The compressed air flows through the first channel 21 to lift the valve core 3.

[0035] The area of ​​the gas flow channel corresponding to the piston 7a is formed by the reversing cover 82 sealing the surface of the reversing sleeve 81. The reversing sleeve 81 is a hollow structure with upper and lower openings. The surface of the reversing cover 82 is also provided with an opening structure. The compressed air flow enters the interior of the reversing sleeve 81 from the opening structure. The combination of the reversing cover 82 and the reversing sleeve 81 is used to provide the normal space required for the movement of the piston 7a. In addition, the lower part of the valve core 3 is supported by the reversing cover 82. Under its own gravity, the valve core 3 closes the opening structure of the reversing cover 82.

[0036] A limit structure 83 is provided in the reversing sleeve 81 for use with the piston 7a to restrict the maximum stroke of the piston 7a in the reciprocating direction, thereby allowing the plug rod 7 to reach the maximum stroke more quickly. In short, the increase in the movement frequency means that the number of reciprocating movements completed per unit time increases.

[0037] The limiting structure 83 is a limiting rubber, which is located at the upper and lower parts of the reversing sleeve 81 respectively. The limiting rubber has a buffering effect.

[0038] In order to prevent the limiting glue from being loosened by the piston 7a, steps 8a are provided inside the reversing sleeve 81 and the reversing cover 82. After the limiting glue is filled, the limiting glue will form a locking shape, cooperating with the step 8a to prevent the limiting glue from loosening.

[0039] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A pneumatic knife, comprising a body, the body having a reciprocating device for making the cutter move back and forth, characterized in that: The reciprocating device is arranged in the gas flow passage in the main body, and a limiting structure close to the reciprocating device is also arranged in the gas flow passage to restrict the maximum stroke in the reciprocating direction.

2. A pneumatic knife according to claim 1, characterized in that: The limiting structures are distributed in the reciprocating direction of the reciprocating device.

3. A pneumatic knife according to claim 1, characterized in that: The gas flow channel is provided with a step, and the limiting structure has a shape matched with the step and is fixed in the gas flow channel in cooperation with the step.

4. A pneumatic knife according to claim 1, characterized in that The limiting structure is a limiting glue.

5. The pneumatic knife according to claim 1, characterized in that: A feedback passage and a valve core are also provided inside the main body. The reciprocating device divides the gas flow path into a first part and a second part which are independent of each other. The feedback passage corresponds to the second part. The negative pressure gas flow formed when the reciprocating device moves flows through the feedback passage into the valve core provided in the first part, pushing the valve core to close the gas flow path.

6. A pneumatic knife according to claim 5, characterized in that: A cavity is provided in the body, and the cavity and the gas flow channel are kept connected. The valve core is arranged in the cavity, and there is a gap fit between the cavity and the cavity. The feedback passage is connected to the cavity, and pressure is applied to the valve core to cut off the flow of compressed air on the gas flow channel.

7. A pneumatic knife according to claim 5 or 6, characterized in that: The area corresponding to the reciprocating device in the body is composed of a reversing sleeve and a reversing cover. The reversing sleeve is sealed on the surface of the reversing cover. The reversing sleeve is a hollow structure with upper and lower openings. The surface of the reversing cover is also provided with an opening structure. The compressed air flow enters the interior of the reversing sleeve from the opening structure. The combination of the reversing cover and the reversing sleeve is used to provide a normal space required for the reciprocating device to move. In addition, the lower part of the valve core is supported by the reversing cover. Under its own gravity, the valve core closes the opening structure of the reversing cover.

8. A pneumatic knife according to any one of claims 1 to 6, characterized in that: The reciprocating device is a plug rod with a piston.

9. A pneumatic knife according to any one of claims 1 to 6, characterized in that: An annular groove is arranged on the circumference of the upper part of the valve core, and the annular groove corresponds to the feedback passage.

10. A leather cutting machine, comprising a pneumatic knife as described in any one of claims 1 to 9, capable of quickly cutting leather.

Images