Floating constant pressure knife holder device

Abstract

The present invention relates to the field of machining, and in particular to a floating constant pressure tool holder device, which includes a movable seat capable of moving along a horizontal plane, a tool holder being arranged on the movable seat, the tool holder including a hard air pipe, a driving piston being arranged in the air pipe, a floating sleeve being arranged outside the air pipe, a lower air pipe joint being sealed and connected to the air tank at the lower end of the air pipe, the upper air pipe joint being connected to the air tank via an upper air pipe with an upper solenoid valve, the lower air pipe joint being connected to the air tank via a lower air pipe with a lower solenoid valve, an upper air pressure sensor being arranged on the upper air pipe, and a lower air pressure sensor being arranged on the lower air pipe, which is convenient to operate, has high working stability and high control accuracy.

Description

Technical Field

[0001] The invention relates to the field of machining, and in particular to a floating constant-pressure tool holder device. Background Art

[0002] Machining includes turning, milling, planing, grinding, boring, etc., and different working heads are used for work. Grinding includes grinding and lapping. Grinding is usually performed with a grinding wheel or a grinding wheel. The existing grinding method is to install a pneumatic or electric grinder on a three-coordinate moving seat, and grind the workpiece by controlling the movement of the tool holder. Since the grinding head is a consumable, the three-coordinate moving seat cannot adjust the height of the tool holder according to the wear of the grinding head during use, resulting in uneven grinding pressure, or even failure to grind, poor control accuracy, and low work efficiency. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a floating constant pressure tool holder device which is easy to operate, has high working stability and high control accuracy.

[0004] The present invention is realized through the following technical scheme: a floating constant pressure knife holder device, which includes a movable seat that can move along a horizontal plane, a knife holder is arranged on the movable seat, and the knife holder includes a hard air pipe, the air pipe is a prismatic shape, a driving piston is arranged in the air pipe, a sealing member is arranged between the driving piston and the inner wall of the air pipe, a driving magnet is arranged on the driving piston, a floating sleeve is arranged outside the air pipe, a gap is fitted between the floating sleeve and the outer wall of the air pipe, a driven block that can be attracted by the driving magnet is arranged on the floating sleeve, a downward cantilever is arranged on the outer side of the floating sleeve, a chuck for clamping a tool is arranged at the lower end of the cantilever, and a sealing member is arranged at the upper end of the air pipe. An upper air pipe joint is sealed and connected, and a lower air pipe joint is sealed and connected at the lower end of the air pipe. The upper air pipe joint is connected to the gas tank via an upper air pipe with an upper solenoid valve, and the lower air pipe joint is connected to the gas tank via a lower air pipe with a lower solenoid valve. An upper air pressure sensor is arranged on the upper air pipe, and a lower air pressure sensor is arranged on the lower air pipe. The upper solenoid valve, the upper air pressure sensor, the lower solenoid valve, and the lower pressure sensor are all connected to a controller. The air pipe is connected to a mounting plate for mounting to a driving device. The gas tank is connected to a compressor, and an air pressure sensor is arranged on the gas tank. The compressor and the air pressure sensor are connected to the controller, and the driving motor of the moving seat is electrically connected to the controller.

[0005] Furthermore, the air pipe is a square steel pipe made of stainless steel, an upper seat plate is provided at the upper end of the air pipe, and a lower seat plate is provided at the lower end of the air pipe, the air pipe is sealed and connected to the upper seat plate and the lower seat plate respectively, through holes are provided on the upper seat plate and the lower seat plate, the air pipe and the upper air pipe joint, and the air pipe and the lower air pipe joint are connected through corresponding through holes, the upper seat plate and the lower seat plate are both set as square plates, the mounting plate is set between the side surfaces of the upper seat plate and the lower seat plate, positioning keys are provided between the mounting plate and the upper seat plate and the lower seat plate, and the mounting plate is connected to the upper seat plate and the lower seat plate by bolts.

[0006] Furthermore, the upper and lower ends of the air pipe are both provided with connecting plates, the connecting plates are bolted to the corresponding seat plates, the upper seat plate and the lower seat plate are provided with grooves at positions corresponding to the air pipe, the two ends of the air pipe are inserted into the corresponding grooves, the outer wall of the air pipe and the inner wall of the groove have tolerance fit, and a sealing gasket is provided between the end face of the air pipe and the bottom surface of the corresponding groove.

[0007] Furthermore, the driving piston includes an upper pressing plate and a lower pressing plate, and the upper pressing plate and the lower pressing plate are both clearance-fitted with the inner wall of the trachea. The driving magnet is arranged between the upper pressing plate and the lower pressing plate. There are two driving magnets, and the two driving magnets are arranged in parallel, and the magnetic poles of the two driving magnets are oriented in the same direction. The upper pressing plate and the lower pressing plate are provided with slots at positions corresponding to the driving magnets on the opposite surfaces thereof, and the upper and lower ends of the driving magnets are respectively inserted into the corresponding slots. A connecting column is provided between the upper pressing plate and the lower pressing plate, and the cross-section of the connecting column is a square. The connecting column is in the shape of a square core ring, the upper end of which is extended to the upper side of the upper pressure plate and is fitted with an upper fixing plate, the lower end of which is extended to the lower side of the lower pressure plate and is fitted with a lower fixing plate, the sealing member comprises sealing rings between the upper pressure plate and the upper fixing plate and between the lower pressure plate and the lower fixing plate, the sealing ring comprises a square core ring, a sealing sleeve is fitted on the core ring, the sealing sleeve and the inner wall of the trachea, and the sealing sleeve and the connecting column are all interference fit, the upper and lower ends of the connecting column are respectively provided with clamping plates for clamping the corresponding fixing plates, the clamping plates are bolted to the connecting column.

[0008] Furthermore, a driven block mounting groove is provided on the floating sleeve at a position corresponding to the end of the driving magnet, and the driven block is mounted in the driven block mounting groove. The driven block is a driven magnet, and the magnetic pole directions of the driven magnet and the driving magnet are opposite.

[0009] Furthermore, a driven block pressing plate for pressing the driven block inward is provided at the outer end of the driven block mounting groove, and an elastic pad is provided between the driven block pressing plate and the driven block.

[0010] Furthermore, an oil film is provided between the floating sleeve and the outer wall of the trachea, sealing ring installation grooves are provided on the inner edges of both ends of the floating sleeve, a sealing ring is installed in the sealing ring installation groove, and sealing ring pressure plates for pressing the sealing ring are respectively provided at the upper and lower ends of the floating sleeve, and the sealing ring pressure plate is bolted to the floating sleeve.

[0011] Furthermore, the cantilever is connected to the floating sleeve via a mounting plate, the mounting plate is connected to the floating sleeve via bolts, and a positioning key is provided between the mounting plate and the floating sleeve.

[0012] The beneficial effects of the present invention are as follows: an air pipe, a driving piston, a floating sleeve, an upper air pipe joint, and a lower air pipe joint are provided, and the driving piston can be driven to move by air pressure, and the floating sleeve and the cantilever can be driven to move by the driving piston. By controlling the air pressure of the upper air pipe joint and the lower air pipe joint, the height and force value of the driving piston can be controlled, thereby realizing the lifting and lowering and pressure control of the tool holder, ensuring the constant pressure value between the working part and the processed part, switching between working and disengagement, and providing a mounting plate to facilitate the connection between the engraving knife seat device and the slider on the crossbeam; providing an upper seat plate and a lower seat plate to ensure the stability of the connection between the air pipe and the mounting plate; providing a groove and a connecting plate to facilitate installation, while ensuring the compression and sealing between the sealing gasket and the groove and the air pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the connection relationship between the components of Example 1;

[0014] Figure 2 It is a schematic diagram of the front cross-sectional view of the tool holder;

[0015] Figure 3 It is a schematic diagram of the left view of the tool holder;

[0016] Figure 4 It is a schematic diagram of a front cross-sectional view of a driving piston;

[0017] Figure 5 It is a schematic diagram of the front cross-sectional view of the floating sleeve;

[0018] Among them: 1-air pipe, 2-upper seat plate, 3-lower seat plate, 4-upper air pipe joint, 5-lower air pipe joint, 6-connecting plate, 7-mounting plate, 8-floating sleeve, 9-cantilever, 10-chuck, 11-tool holder, 12-driving piston, 13-upper pressure plate, 14-lower pressure plate, 15-connecting column, 16-driving magnet, 17-upper fixed plate, 18-lower fixed plate, 19-core ring, 20-sealing sleeve, 21-mounting plate, 2 2-sealing ring, 23-sealing ring pressure plate, 24-driven block, 25-driven block pressure plate, 26-elastic pad, 27-sealing pad, 28-positioning key, 29-upper air pipe, 30-upper solenoid valve, 31-upper air pressure sensor, 32-lower air pipe, 33-lower solenoid valve, 34-lower air pressure sensor, 35-gas tank, 36-air pressure sensor, 37-controller, 38-compressor, 39-shielded cable, 40-movable seat. DETAILED DESCRIPTION

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0021] Example 1

[0022] like Figure 1-5As shown, a floating constant pressure knife holder device includes a movable seat 40 that can move along a horizontal plane, the movable seat is a gantry seat that can move along the X-axis and the Y-axis, and is driven by a servo motor. A knife holder 11 is installed on the movable seat, including a hard air pipe 1, the air pipe is a copper pipe or a stainless steel pipe, and the air pipe is a prismatic shape. In this embodiment, the air pipe is a stainless steel square steel pipe, which is thermoplastically formed. An upper seat plate 2 is installed at the upper end of the air pipe, and a lower seat plate 3 is installed at the lower end of the air pipe. Both the upper seat plate and the lower seat plate are aluminum alloy plates, which are light in weight, high in structural strength, and easy to process. The air pipe is sealed and connected to the upper seat plate and the lower seat plate respectively. The upper end of the trachea is sealed and connected with an upper trachea joint 4, and the lower end of the trachea is sealed and connected with a lower trachea joint 5. Specifically, through holes are processed on the upper seat plate and the lower seat plate, and the trachea and the upper trachea joint, and the trachea and the lower trachea joint are connected through corresponding through holes. The upper seat plate and the lower seat plate are both square plates. A mounting plate 7 for mounting to a drive device is installed between the upper seat plate and the side of the lower seat plate by bolts. A positioning key 28 is installed between the mounting plate and the upper seat plate and the lower seat plate, which can be accurately positioned to ensure installation accuracy and improve connection stability. The upper and lower ends of the trachea are both equipped with a connecting plate 6 , the connecting plate is bolted to the corresponding seat plate, grooves are processed at the positions corresponding to the air pipe on the upper seat plate and the lower seat plate, and the two ends of the air pipe are inserted into the corresponding grooves. The tolerance between the outer wall of the air pipe and the inner wall of the groove can ensure the installation accuracy between the air pipe and the upper seat plate and the lower seat plate, and ensure the stability of the engraving work. A sealing gasket 27 is installed between the end face of the air pipe and the bottom surface of the corresponding groove. The air pipe, the sealing gasket and the bottom surface of the groove can be pressed together through the connecting plate to ensure the sealing effect. The sealing gasket is made of rubber sealing gasket, which has high sealing performance and long service life. The upper air pipe joint is connected by an upper electromagnetic The upper air pipe 29 of the valve 30 is connected to the air tank 35, and the lower air pipe joint is connected to the air tank through the lower air pipe 32 with the lower solenoid valve 33. The upper air pressure sensor 31 is installed on the upper air pipe, and the lower air pressure sensor 34 is installed on the lower air pipe. The air tank is connected to a compressor 38, and an air pressure sensor 36 is installed on the air tank. The upper solenoid valve, the upper air pressure sensor, the lower solenoid valve, the lower pressure sensor, the compressor, the air pressure sensor and the servo motor are all connected to the controller 37 through a shielded cable 39. The controller is a PLC controller with high compatibility and high working stability. The PLC controller is connected to the touch screen.

[0023] A driving piston 12 is installed in the trachea, a sealing member is installed between the driving piston and the inner wall of the trachea, and a driving magnet 16 is installed on the driving piston. Specifically, the driving piston includes an upper pressing plate 13 and a lower pressing plate 14, both of which are aluminum alloy plates, and there is a clearance fit between the upper pressing plate and the lower pressing plate and the inner wall of the trachea, and the driving magnet is installed between the upper pressing plate and the lower pressing plate. There are two driving magnets, and the two driving magnets are installed in parallel, and the magnetic poles of the two driving magnets are oriented in the same direction. Grooves are processed on the opposite surfaces of the upper pressing plate and the lower pressing plate at positions corresponding to the driving magnets, and the upper and lower ends of the driving magnets are respectively inserted into the corresponding grooves, and a connecting column 15 is installed between the upper pressing plate and the lower pressing plate. The connecting column is made of stainless steel, and the cross-section of the connecting column is square. The two driving magnets are located on both sides of the connecting column, and the upper end of the connecting column extends to the upper side of the upper pressing plate and is provided with an upper A fixing plate 17, the lower end of the connecting column extends to the lower side of the lower pressure plate and is sleeved with a lower fixing plate 18, both the upper fixing plate and the lower fixing plate are stainless steel plates, the sealing member includes sealing rings between the upper pressure plate and the upper fixing plate, and between the lower pressure plate and the lower fixing plate, the sealing ring includes a square core ring 19, the core ring is made of stainless steel material, a sealing sleeve 20 is sleeved on the core ring, the sealing sleeve is made of silicone rubber, the sealing sleeve and the core ring are molded, there is an interference fit between the sealing sleeve and the inner wall of the trachea, and between the sealing sleeve and the connecting column, the core ring can prevent the pressure plate and the fixing plate from crushing the sealing ring, provide support for the sealing sleeve, and improve the sealing effect, the upper and lower ends of the connecting column are respectively provided with clamping plates 21 for clamping the corresponding fixing plates, the clamping plate and the connecting column are bolted, the pressure plate is a stainless steel plate, to ensure the stability of the driving piston, the end of the connecting column is located in the corresponding fixing plate.

[0024] The trachea is covered with a floating sleeve 8, which is a square steel pipe. The floating sleeve is fitted with a gap between the floating sleeve and the outer wall of the trachea. A driven block 24 that can be attracted by the driving magnet is installed on the floating sleeve. Specifically, a driven block mounting groove is processed at a position corresponding to the end of the driving magnet on the floating sleeve. The driven block is installed in the driven block mounting groove. The driven block is a driven magnet. The magnetic poles of the driven magnet and the driving magnet are opposite. A driven block pressure plate 25 for pressing the driven block inward is installed at the outer end of the driven block mounting groove. An elastic elastic member is installed between the driven block pressure plate and the driven block. Pad, install the driven block pressure plate and elastic pad 26, which can fix the driven block in the driven block installation groove. There is an oil film between the floating sleeve and the outer wall of the air pipe, which can reduce the friction between the floating sleeve and the air pipe and improve the working stability. The inner edges of both ends of the floating sleeve are processed with sealing ring installation grooves, and a sealing ring 22 is installed in the sealing ring installation groove. The sealing ring is a rubber sealing ring, which can prevent oil film leakage. The upper and lower ends of the floating sleeve are respectively installed with sealing ring pressure plates 23 for pressing the sealing ring. The sealing ring pressure plate and the floating sleeve are bolted to facilitate installation.

[0025] A downward cantilever 9 is installed on the outer side of the floating sleeve, and the cantilever is connected to the floating sleeve through a mounting plate 29, and the mounting plate is connected to the floating sleeve through bolts. A positioning key is installed between the mounting plate and the floating sleeve, and a chuck 10 for clamping the working part is installed at the lower end of the cantilever. In this embodiment, the working part is an electric angle grinder, the grinding head is downward, and the driving power supply is electrically connected to the controller.

[0026] The working principle of the floating constant pressure tool holder device provided in this embodiment is as follows: after the floating constant pressure tool holder device is installed, the angle grinder is fixed on the chuck, the power is turned on, the compressor works, the air pressure in the gas tank reaches the preset value P, the compressor stops working, and the controller controls the lower solenoid valve to act until the lower air pressure sensor detects a pressure of P0, the lower solenoid valve acts to close, the upper solenoid valve acts until the upper air pressure sensor detects a pressure of P1, the lower solenoid valve acts to close, at this time, the grinding head rises to a predetermined height with the floating sleeve, the moving seat coordinates are initialized, and the pressure difference ΔP between the upper air pipe air pressure and the lower air pipe air pressure is set in the controller. When the pressure difference between the upper air pipe air pressure and the lower air pipe air pressure is ΔP, the pressure value between the grinding head and the workpiece to be processed is the preset pressure value, which ensures uniform grinding. Initialization is completed, and the work is started by touching the level, and the moving seat coordinates are initialized. The seat drives the tool holder to move to the predetermined position, and the upper solenoid valve is activated, resulting in a pressure difference of ΔP between the air pressure in the upper air pipe and the air pressure in the lower air pipe. The movable tool holder drives the tool holder to move along the predetermined trajectory for grinding. During the grinding process, the control machine detects the pressure difference between the air pressure in the upper air pipe and the air pressure in the lower air pipe at intervals of 1-2s. When the pressure difference exceeds the predetermined range, the upper solenoid valve is activated to return the difference to ΔP. When the grinding head is worn, the pressure value between the grinding head and the workpiece to be processed can still be guaranteed to be constant, thereby ensuring the grinding accuracy. When the air pressure value in the gas tank is lower than the preset range, the compressor works to make the air pressure in the gas tank reach P again, thereby ensuring stable operation. After the movable seat drives the tool holder to complete the movement along the preset trajectory, the upper solenoid valve is activated until the upper air pressure sensor detects a pressure of P1, the grinding head is separated from the workpiece, and the movable seat drives the tool holder to reset, thereby completing the grinding work.

[0027] It is worth noting that the floating constant pressure tool holder device provided by the present invention can be widely used in working scenarios where the working head is easily damaged, is suitable for wide promotion, and has high working precision.

[0028] During use, according to different usage scenarios and pressure requirements, you can choose to use air, nitrogen or hydraulic oil as the transmission medium. It has strong adaptability. When using hydraulic oil, replace the compressor with a fluid replenishment pump, and replace the upper solenoid valve and the lower solenoid valve with a booster pump. It is easy to use.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A floating constant pressure tool holder device, characterized in that: The invention comprises a movable seat capable of moving along a horizontal plane, a knife seat being arranged on the movable seat, the knife seat comprising a hard air pipe, the air pipe being a prismatic shape, a driving piston being arranged in the air pipe, a sealing member being arranged between the driving piston and the inner wall of the air pipe, a driving magnet being arranged on the driving piston, a floating sleeve being arranged outside the air pipe, a clearance being fitted between the floating sleeve and the outer wall of the air pipe, a driven block capable of being attracted by the driving magnet being arranged on the floating sleeve, a downward cantilever being arranged on the outer side surface of the floating sleeve, a chuck for clamping a working part being arranged at the lower end of the cantilever, an upper air pipe joint being sealed and connected to the upper end of the air pipe, and the air pipe The lower end is sealed and connected with a lower air pipe joint, the upper air pipe joint is connected to the gas tank through an upper air pipe with an upper solenoid valve, the lower air pipe joint is connected to the gas tank through a lower air pipe with a lower solenoid valve, an upper air pressure sensor is arranged on the upper air pipe, a lower air pressure sensor is arranged on the lower air pipe, the upper solenoid valve, the upper air pressure sensor, the lower solenoid valve and the lower pressure sensor are all connected to a controller, the air pipe is connected to a mounting plate for mounting to a driving device, the gas tank is connected to a compressor, an air pressure sensor is arranged on the gas tank, the compressor and the air pressure sensor are connected to the controller, and the driving motor of the moving seat is electrically connected to the controller.

2. The floating constant pressure tool holder device according to claim 1, characterized in that: The air pipe is a square steel pipe made of stainless steel, an upper seat plate is provided at the upper end of the air pipe, and a lower seat plate is provided at the lower end of the air pipe, the air pipe is sealed with the upper seat plate and the lower seat plate respectively, through holes are provided on the upper seat plate and the lower seat plate, the air pipe and the upper air pipe joint, and the air pipe and the lower air pipe joint are connected through corresponding through holes, the upper seat plate and the lower seat plate are both set as square plates, the mounting plate is set between the side surfaces of the upper seat plate and the lower seat plate, positioning keys are provided between the mounting plate and the upper seat plate and the lower seat plate, and the mounting plate is connected to the upper seat plate and the lower seat plate by bolts.

3. The floating constant pressure tool holder device according to claim 2, characterized in that: The upper and lower ends of the air pipe are both provided with connecting plates, and the connecting plates are bolted to the corresponding seat plates. Grooves are provided on the upper and lower seat plates at positions corresponding to the air pipe, and the two ends of the air pipe are inserted into the corresponding grooves. The outer wall of the air pipe and the inner wall of the groove have a tolerance fit, and a sealing gasket is provided between the end face of the air pipe and the bottom surface of the corresponding groove.

4. The floating constant pressure tool holder device according to claim 2, characterized in that: The driving piston comprises an upper pressing plate and a lower pressing plate, and the upper pressing plate and the lower pressing plate are both clearance-fitted with the inner wall of the trachea, and the driving magnet is arranged between the upper pressing plate and the lower pressing plate. There are two driving magnets, and the two driving magnets are arranged in parallel, and the magnetic poles of the two driving magnets face the same direction. The upper pressing plate and the lower pressing plate are provided with slots at positions corresponding to the driving magnets on the opposite surfaces thereof, and the upper and lower ends of the driving magnets are respectively inserted into the corresponding slots, and a connecting column is provided between the upper pressing plate and the lower pressing plate, and the cross-section of the connecting column is square. The upper end of the connecting column extends to the upper side of the upper pressure plate and is mounted on an upper fixing plate, and the lower end of the connecting column extends to the lower side of the lower pressure plate and is mounted on a lower fixing plate. The sealing member includes sealing rings between the upper pressure plate and the upper fixing plate and between the lower pressure plate and the lower fixing plate. The sealing ring includes a square core ring, and a sealing sleeve is mounted on the core ring. The sealing sleeve and the inner wall of the trachea and the sealing sleeve and the connecting column are both interference fit. The upper and lower ends of the connecting column are respectively provided with clamping plates for clamping the corresponding fixing plates, and the clamping plates are bolted to the connecting column.

5. The floating constant pressure tool holder device according to claim 4, characterized in that: A driven block mounting groove is arranged on the floating sleeve at a position corresponding to the end of the driving magnet. The driven block is mounted in the driven block mounting groove. The driven block is a driven magnet. The magnetic pole directions of the driven magnet and the driving magnet are opposite.

6. The floating constant pressure tool holder device according to claim 5, characterized in that: A driven block pressing plate for pressing the driven block inwards is arranged at the outer end of the driven block installation groove, and an elastic pad is arranged between the driven block pressing plate and the driven block.

7. The floating constant pressure tool holder device according to claim 1, characterized in that: An oil film is arranged between the floating sleeve and the outer wall of the trachea, sealing ring installation grooves are arranged at the inner edges of both ends of the floating sleeve, a sealing ring is installed in the sealing ring installation groove, and sealing ring pressing plates for pressing the sealing ring are respectively arranged at the upper and lower ends of the floating sleeve, and the sealing ring pressing plate is bolted to the floating sleeve.

8. The floating constant pressure tool holder device according to claim 1, characterized in that: The cantilever is connected to the floating sleeve via a mounting plate, the mounting plate is connected to the floating sleeve via bolts, and a positioning key is arranged between the mounting plate and the floating sleeve.

Images