Press fitting machine structure with press fitting stroke intelligent loop control function

Abstract

The invention belongs to the technical field of press-fitting machines for gas masks, particularly relates to a press-fitting machine structure for press-fitting stroke intelligent loop control, and solves the technical problems of unstable press-fitting qualification rate and high rejection rate of gas mask parts caused by poor pressure control precision in the existing gas mask assembly process. The lifting machine comprises a machine body, a motor driving control unit, a lifting machine assembly and a pressure sensor, the lifting machine assembly comprises a worm, a guide sleeve, a worm gear, a gland and a lead screw, the lead screw is rotationally installed on the top supporting table through the guide sleeve and the gland, the worm penetrates through an installation cavity, the two ends of the worm are rotationally connected with the top supporting table, and the worm is meshed with the worm gear; a positioning tire is arranged on the bottom plate, and a pressure sensor is arranged in the positioning tire. The press-fitting machine can accurately control torque output of the motor through digital PWM voltage regulation and PID control technologies, meanwhile, a built-in pressure sensor is used for detecting a pressure value in real time and feeding back a signal for analysis and control, and the pressure is controlled to be stable.

Description

Technical Field

[0001] The invention relates to the technical field of press-fitting machines for gas masks, and in particular to a press-fitting machine structure with intelligent loop control of the press-fitting stroke. Background Art

[0002] In order to achieve the protection function of the gas mask, the gas mask mainly installs various functional components on the gas mask body and requires that each functional component achieves an airtight effect after installation. The various functional components of the gas mask are mainly made of plastic materials, and the various functional components are installed in the positions of the functional components of the mask body through concave and convex rib structures. The functional component group should include the main intercom component, the eye window component, the tank joint seat component, the auxiliary intercom component, etc. The installation of these components in China is mainly done by manual or electric (pneumatic) methods to provide the required assembly pressure and install the components on the gas mask body. The installation quality of the mask determines the overall protective performance of the mask. The main technical defects in the current gas mask assembly process are: 1) When manual pressing is used, it is difficult for personnel to control the pressure required for pressing the parts. When the pressure applied is small, the pressing parts may not be installed in place and need to be disassembled and reinstalled, which reduces the production efficiency of gas masks; 2) When pneumatic pressing is used, due to the instability of the air source pressure, the pressing pressure needs to be adjusted several times during the pressing process to meet the pressing pressure requirements of each component, which prolongs the assembly time of the gas mask; 3) When electric pressing is used, the pressing pressure is mainly provided by the torque motor. The pressure range of the torque motor itself is too large. Although the output pressure can be reduced or increased by adjusting the current signal, it is difficult to control the pressure required for the assembly of gas mask components. It is easy for the gas mask components to be not pressed into place or the components to be damaged, which increases the workload of assembly and the scrap rate. Summary of the invention

[0003] In order to overcome the technical defects of poor pressure control accuracy in the existing gas mask assembly process, resulting in unstable gas mask component press-fitting qualification rate and high scrap rate, the present invention provides a press-fitting machine structure with intelligent circuit control of the press-fitting stroke.

[0004] The present invention provides a press machine structure with intelligent circuit control of press stroke, including a machine body, a motor drive control unit, a lift assembly and a pressure sensor. The machine body includes a bottom plate, a top support platform and a vertical support frame connecting the bottom plate and the top support platform. The lift assembly is installed on the top support platform. The lift assembly includes a worm, a guide sleeve, a worm wheel, a pressure cover and a lead screw. An installation cavity is provided in the middle of the top support platform. The worm wheel is fixedly matched with the lead screw, and the lead screw passes through the installation cavity. The worm wheel is located in the installation cavity. The lead screw is rotatably installed on the top support platform through the upper guide sleeve and the lower pressure cover. The worm passes through the installation cavity and the two ends of the worm are rotatably connected with the top support platform, and the worm is meshed with the worm wheel. A positioning tire is provided on the bottom plate, a lower tire is provided on the positioning tire, a pressure sensor is built in the positioning tire, and the lead screw An upper jig is connected to the bottom, and the upper and lower positions of the upper jig and the lower jig correspond to each other; the electric drive control unit includes a drive control circuit and a DC torque motor, the output shaft of the DC torque motor is connected to the worm drive, and the DC torque motor converts the motor rotation into a linear motion of the lead screw under the control of the drive control circuit; the drive control circuit includes an ARM processor, a photoelectric isolation circuit, an H-bridge function drive circuit, a current detection circuit and an A / D conversion circuit, the ARM processor is connected to the DC torque motor through the photoelectric isolation circuit and the H-bridge function drive circuit in turn, and the ARM processor controls the torque output of the DC torque motor through digital PWM voltage regulation and PID control technology; the pressure sensor feeds back the pressure value and feedback signal to the ARM processor in real time through the current detection circuit and the A / D conversion circuit in turn.

[0005] The assembly of the gas mask mainly involves installing various plastic parts on the rubber mask body. The connection method is mainly achieved through the concave and convex rib structure of the plastic parts. During the specific installation, the press-fit parts and the gas mask body are placed between the lower mold and the upper mold, and the lead screw moves downward. Under a certain pressure, the press-fit parts and the gas mask body are pressed into place. The elevator assembly is driven by a DC torque motor. The rotation of the DC torque motor rotates the worm, and the gear on the worm drives the turbine to rotate. The clockwise or counterclockwise rotation of the worm wheel drives the lead screw to move up and down. The guide sleeve and the gland can ensure the verticality of the lead screw movement. The up and down movement of the lead screw completes the removal and application of the pressure required for the assembly of the gas mask; therefore, the motor rotation is converted into a linear motion of the lead screw through the lead screw. In order to ensure the safety of the press-fit process, the elevator assembly deceleration structure is designed to ensure that when the lead screw is pressed down at a low speed, the output pressure of the DC torque motor can be fully utilized, thereby meeting the press-fit pressure requirements of the press-fit machine. There are mechanical limit structures on the upper and lower sides of the elevator assembly. Even if the motor is out of control, it will not cause damage to personnel and equipment. All components (including electrical components) are installed inside the fuselage, with a simple structure and easy operation. The present invention adopts a closed-loop control method. The ARM processor can accurately control the torque output of the DC torque motor through digital PWM voltage regulation and PID control technology. After transmission through the elevator assembly, the output pressure meets the index requirement of 6100N±400N. At the same time, a pressure sensor is built into the positioning tire to detect the pressure value in real time and feed it back to the ARM processor to achieve precise pressure control and stable output pressure, thus avoiding the problem of press-fitting failure caused by pressure differences caused by different pressing points due to different sizes and structures of components. According to tests, when the press-fitting pressure reaches between 5600N and 6500N, the press-fitting pass rate of gas mask components can reach more than 95%. Pressure Preferably, it also includes a touch screen, which is electrically connected to the ARM processor to achieve human-computer interaction. This arrangement makes it convenient for operators to set and adjust the specific pressure.

[0006] Preferably, the electric drive control unit is connected to a power supply system, which includes a leakage protector, a power filter, an AC-DC power supply, a power filter protection circuit and a DC-DC isolation power supply connected in sequence. The leakage protector is connected to a 220V±10% mains power supply, which is converted into 24V direct current after being processed by the leakage protector, the power filter and the AC-DC power supply in sequence, providing a power supply for the DC torque motor; the 24V direct current is converted into 5V direct current after being processed by the power filter protection circuit and the DC-DC isolation power supply, and supplies power to the drive control circuit. This arrangement is structurally reasonable.

[0007] Compared with the prior art, the technical solution provided by the present invention has the following technical effects: the structure of a press machine with an intelligent circuit control of a press-fitting stroke described in the present invention is simple and reasonable in structure, and all components (including electrical components) are installed inside the machine body, with a simple structure and easy operation; the press machine adopts a closed-loop control method, and through digital PWM voltage regulation and PID control technology, it can accurately control the motor torque output, and at the same time, through the built-in pressure sensor, the pressure value and feedback signal are detected in real time for analysis and control, so as to control the pressure to be stable and improve the precise control of the pressure required for the gas mask; by analyzing the press-fitting qualified rate of plastic parts under different pressures and the optimal pressure control point, the stroke and pressure of the press machine are accurately controlled to achieve precise installation of plastic parts, improve the press-fitting efficiency, effectively improve the press-fitting qualified rate of gas masks, and reduce the scrap rate of gas masks. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0010] Figure 1 It is a front structural schematic diagram of a press-fitting machine structure controlled by an intelligent circuit for press-fitting stroke according to a certain embodiment of the present invention; Figure 2 It is a side structural schematic diagram of a press machine structure controlled by a press stroke intelligent loop according to a certain embodiment of the present invention; Figure 3 is a longitudinal cross-sectional view of the elevator assembly described in an embodiment of the present invention; Figure 4 is a transverse cross-sectional view of the elevator assembly described in an embodiment of the present invention; Figure 5 It is a schematic diagram of the overall electrical connection of the electric drive control unit described in a certain embodiment of the present invention; Figure 6 The figure is a schematic diagram of the positions of the press-fit components, the anti-gas cover, the lower mold and the upper mold in a certain embodiment of the present invention.

[0011] In the figure: 1. body; 2. lift assembly; 3. motor drive control unit; 4. positioning tire; 5. worm; 6. guide sleeve; 7. worm wheel; 8. gland; 9. lead screw; 10. mounting cavity; 11. lower mold; 12. upper mold; 13. drive control circuit; 14. DC torque motor; 15. press-fit components; 16. anti-toxic cover; 17. power supply system. DETAILED DESCRIPTION

[0012] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0013] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0014] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0015] The following is combined with Figures 1 to 6 The specific embodiments of the present invention are described in detail.

[0016] In one embodiment, Figure 1As shown, a press machine structure controlled by an intelligent circuit of press stroke includes a body 1, a motor drive control unit 3, a lift assembly 2 and a pressure sensor. The body 1 includes a bottom plate, a top support platform and a vertical support frame connecting the bottom plate and the top support platform. The lift assembly 2 is installed on the top support platform. The lift assembly 2 includes a worm 5, a guide sleeve 6, a worm wheel 7, a pressure cover 8 and a lead screw 9. An installation cavity 10 is provided in the middle of the top support platform. The worm wheel 7 is fixedly matched with the lead screw 9, and the lead screw 9 passes through the installation cavity 10. The worm wheel 7 is located in the installation cavity 10. The lead screw 9 is rotatably installed on the top support platform through the upper guide sleeve 6 and the lower pressure cover 8. The worm 5 passes through the installation cavity 10 and the two ends of the worm 5 are rotatably connected to the top support platform. The worm 5 is meshed with the worm wheel 7. A positioning tire 4 is provided on the bottom plate, and a lower tire 11 is provided on the positioning tire 4. The positioning tire 4 has a built-in pressure sensor. The bottom of the lead screw 9 is connected to an upper mold 12, and the upper and lower positions of the upper mold 12 and the lower mold 11 correspond to each other; the electric drive control unit includes a drive control circuit 13 and a DC torque motor 14, the output shaft of the DC torque motor 14 is connected to the worm 5, and the DC torque motor 14 converts the motor rotation into a linear motion of the lead screw 9 under the control of the drive control circuit 13; the drive control circuit 13 includes an ARM processor, a photoelectric isolation circuit, an H-bridge function drive circuit, a current detection circuit and an A / D conversion circuit, the ARM processor is connected to the DC torque motor 14 through the photoelectric isolation circuit and the H-bridge function drive circuit in turn, and the ARM processor controls the torque output of the DC torque motor 14 through digital PWM voltage regulation and PID control technology; the pressure sensor feeds back the pressure value and feedback signal to the ARM processor in real time through the current detection circuit and the A / D conversion circuit in turn.

[0017] The assembly of the gas mask mainly involves installing various plastic parts on the rubber cover body, and the connection method is mainly achieved through the concave and convex rib structure of the plastic parts. During the specific installation, the press-fit component 15 and the gas cover body 16 are placed between the lower mold 11 and the upper mold 12, and the screw 9 moves downward. Under a certain pressure, the press-fit component 15 and the gas cover body 16 are pressed into place. The lift assembly 2 is driven by a DC torque motor 14. The rotation of the DC torque motor 14 rotates the worm 5. The gear on the worm 5 drives the turbine to rotate. The clockwise or counterclockwise rotation of the worm wheel 7 drives the lead screw 9 to move up and down. The guide sleeve 6 and the gland 8 can ensure the verticality of the movement of the lead screw 9. The up and down movement of the lead screw 9 completes the removal and application of the pressure required for the assembly of the gas mask. Therefore, the motor rotation is converted into a linear motion of the lead screw 9 by the lead screw 9. In order to ensure the safety of the press-fitting process, the deceleration structure of the lift assembly 2 is designed to ensure that when the lead screw 9 is pressed down at a low speed, the output pressure of the DC torque motor 14 can be fully utilized, thereby meeting the press-fitting pressure requirements of the press-fitting machine. The lift assembly 2 is provided with mechanical limit structures at the top and bottom. Even if the motor is out of control, it will not cause damage to personnel and equipment. All components (including electrical components) are installed inside the fuselage 1, with a simple structure and easy operation. The present invention adopts a closed-loop control method. The ARM processor can accurately control the torque output of the DC torque motor 14 through digital PWM voltage regulation and PID control technology. After transmission by the elevator component 2, the output pressure meets the index requirement of 6100N±400N. At the same time, a pressure sensor is built into the positioning tire 4, which can detect the pressure value in real time and feed it back to the ARM processor to achieve precise pressure control and stable output pressure, thus avoiding the problem of press-fitting failure caused by pressure differences caused by different pressing points due to different sizes and structures of components. According to tests, when the press-fitting pressure reaches between 5600N and 6500N, the press-fitting pass rate of gas mask components can reach more than 95%. Pressure On the basis of the above embodiment, in a preferred embodiment, a touch LCD screen is further included, and the touch LCD screen is electrically connected to the ARM processor to realize human-computer interaction. This arrangement makes it convenient for operators to set and adjust the specific pressure.

[0018] On the basis of the above embodiments, in a preferred embodiment, the electric drive control unit is connected to a power supply system 17, which includes a leakage protector, a power filter, an AC-DC power supply, a power filter protection circuit and a DC-DC isolation power supply connected in sequence, the leakage protector is connected to a 220V±10% mains power supply, the mains power supply is sequentially processed by the leakage protector, the power filter and the AC-DC power supply and converted into 24V direct current to provide power supply for the DC torque motor 14; the 24V direct current is converted into 5V direct current after being processed by the power filter protection circuit and the DC-DC isolation power supply to supply power to the drive control circuit 13. Such a setting structure is reasonable.

[0019] Specific implementation methods enable those skilled in the art to understand or implement the present invention. Although detailed descriptions have been made with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A press machine structure with intelligent circuit control of press stroke, characterized in that: The invention comprises a body (1), a motor drive control unit (3), a lift assembly (2) and a pressure sensor. The body (1) comprises a bottom plate, a top support platform and a vertical support frame connecting the bottom plate and the top support platform. The lift assembly (2) is mounted on the top support platform. The lift assembly (2) comprises a worm (5), a guide sleeve (6), a worm wheel (7), a pressure cover (8) and a lead screw (9). An installation cavity (10) is arranged in the middle of the top support platform. The worm wheel (7) and the lead screw (9) are fixedly assembled. The screw (9) passes through the installation cavity (10), the worm wheel (7) is located in the installation cavity (10), the screw (9) is rotatably installed on the top support platform through the upper guide sleeve (6) and the lower pressure cover (8), the worm (5) passes through the installation cavity (10) and the two ends of the worm (5) are rotatably connected to the top support platform, and the worm (5) is meshed with the worm wheel (7); a positioning tire (4) is provided on the bottom plate, a lower tire (11) is provided on the positioning tire (4), and a pressure built in the positioning tire (4) A force sensor is provided, wherein the bottom of the lead screw (9) is connected to an upper mold (12), and the upper mold (12) corresponds to the lower mold (11) in upper and lower positions; the electric drive control unit comprises a drive control circuit (13) and a DC torque motor (14), the output shaft of the DC torque motor (14) is transmission-connected to the worm (5), and the DC torque motor (14) converts motor rotation into linear motion of the lead screw (9) under the control of the drive control circuit (13); the drive control circuit (13) comprises an ARM processor, a photoelectric isolation circuit, an H-bridge function drive circuit, a current detection circuit and an A / D conversion circuit, the ARM processor is connected to the DC torque motor (14) through the photoelectric isolation circuit and the H-bridge function drive circuit in turn, and the ARM processor controls the torque output of the DC torque motor (14) through digital PWM voltage regulation and PID control technology; the pressure sensor feeds back the pressure value and feedback signal to the ARM processor in real time through the current detection circuit and the A / D conversion circuit in turn.

2. According to claim 1, a press machine structure with press stroke intelligent circuit control is characterized in that: The device also includes a touch LCD screen, which is electrically connected to the ARM processor to achieve human-computer interaction.

3. A press machine structure with press stroke intelligent circuit control according to claim 2, characterized in that: The electric drive control unit is connected to a power supply system (17), which includes a leakage protector, a power filter, an AC-DC power supply, a power filter protection circuit and a DC-DC isolation power supply connected in sequence. The leakage protector is connected to a 220V±10% mains power supply, which is converted into 24V direct current after being processed by the leakage protector, the power filter and the AC-DC power supply in sequence, thereby providing a power supply for the DC torque motor (14); the 24V direct current is converted into 5V direct current after being processed by the power filter protection circuit and the DC-DC isolation power supply, thereby providing power for the drive control circuit (13).

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