CN110142690B - Constant force device and grinding processing equipment - Google Patents
Constant force device and grinding processing equipment Download PDFInfo
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- CN110142690B CN110142690B CN201910534166.4A CN201910534166A CN110142690B CN 110142690 B CN110142690 B CN 110142690B CN 201910534166 A CN201910534166 A CN 201910534166A CN 110142690 B CN110142690 B CN 110142690B
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- 238000000227 grinding Methods 0.000 title claims abstract description 11
- 238000012545 processing Methods 0.000 title abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 69
- 210000000056 organ Anatomy 0.000 claims description 13
- 230000001681 protective effect Effects 0.000 claims description 11
- 238000007667 floating Methods 0.000 claims description 7
- 238000003754 machining Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 18
- 239000000428 dust Substances 0.000 description 13
- 238000009434 installation Methods 0.000 description 7
- 230000008602 contraction Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000035882 stress Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 210000004712 air sac Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/34—Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/04—Protective covers for the grinding wheel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
- Actuator (AREA)
Abstract
The application provides a constant force device and grinding processing equipment relates to intelligent processing field. The constant force device comprises a constant pressure output unit for realizing constant force output, a telescopic cover body and a pneumatic pressure compensation device. The telescopic cover body comprises a first mounting port connected with an external device, a second mounting port connected with a stress device and a sealing cavity for accommodating the constant pressure output unit. The air pressure compensation device comprises a contractible closed space, and the contractible closed space is communicated with the sealing cavity and is used for maintaining the air pressure of the sealing cavity to be stable when the volume of the sealing cavity changes. The constant force device can realize the stable air pressure of the sealing space in the constant force device and improve the sealing characteristic of the sealing space of the constant force device.
Description
Technical Field
The application relates to the field of intelligent machining, in particular to a constant force device and grinding machining equipment.
Background
In the ceramic bathroom production and processing process, the material of the blank to be processed is soft, dust is easy to generate in the grinding and processing process, and therefore dustproof measures are required. In order to achieve a better dustproof effect, a dust cover is arranged on the outer side of processing equipment generally, so that isolation from external dust is achieved. In automated polishing, a device having a buffer capacity is generally used to achieve a constant force output of a polishing apparatus in order to improve polishing quality. To prevent dust from entering the constant force output device, the constant force output device needs to form a sealed space together with the dust cover. Constant force output devices are typically configured with a variable volume bellows to maintain a constant force output.
When the constant force output device receives an external force to change the volume of the telescopic cavity, the air pressure in the dust cover is increased or decreased along with the change, and accordingly, the air in the dust cover tends to bulge outwards or the air outside the dust cover tends to drill inwards, so that certain damage capability exists on the sealing performance of a sealing space formed by the constant force output device and the dust cover.
Disclosure of Invention
An object of the embodiments of the present application is to provide a constant force device, which can realize the air pressure stabilization of a sealed space formed by a constant force output device and a dust cover, and improve the sealing characteristics of the sealed space formed by the constant force output device and the dust cover.
In a first aspect, embodiments of the present application provide a constant force device comprising:
the constant pressure output unit is used for realizing constant force output;
the telescopic cover body comprises a first mounting port connected with an external device, a second mounting port connected with a stress device and a sealing cavity for accommodating the constant pressure output unit;
the air pressure compensation device comprises a contractible closed space, wherein the contractible closed space is communicated with the sealing cavity and is used for maintaining the air pressure of the sealing cavity to be stable when the volume of the sealing cavity changes.
In the implementation process, the contractible closed space and the interior of the sealing cavity form a closed and contractible space, and when the constant pressure output unit performs the telescopic movement, the volume of the interior of the sealing cavity changes. When the internal volume of the sealing cavity is increased, the contractible closed space expands; when the internal volume of the sealing cavity is reduced, the contractible airtight space contracts, so that the air pressure inside the sealing cavity is stable through the contraction characteristic of the contractible airtight space, and the sealing characteristic of the constant pressure output unit is improved.
As one embodiment, the constant force device further comprises a mounting plate comprising a mounting portion and an extension portion;
the mounting part is mounted on the first mounting port; the mounting part is provided with a first air passage which is communicated with the sealing cavity and the contractible airtight space;
the extension is configured with a flange that is connected to the external device.
In the implementation process, the installation part is arranged at the first installation port, and the installation part is positioned at the middle upper part of the constant force device relative to the telescopic cover body and the air pressure compensation device, so that the rigidity of the whole constant force device can be better.
In one possible implementation, the mounting portion and the extension portion are disposed at an angle.
In the implementation process, the extending part is obliquely arranged relative to the mounting part, and has a position relation with an angle range of 180 degrees with the extending part, the inclined angle range between the extending part and the mounting part can be enlarged by the inclination of the extending part, and the extending part has more mounting reserved space. The installation reserved space of the extension part is enlarged, and the extension part can be more conveniently connected with an external device.
In one possible implementation, the air pressure compensation device includes:
the annular supporting piece is arranged on the side, away from the sealing cavity, of the mounting part, and an inner annular through hole of the annular supporting piece covers the outlet of the first air passage;
the first air bag is sleeved and hooped on the periphery of the upper middle part of the annular supporting piece.
In the implementation process, the inner ring through hole of the annular supporting piece covers the outlet of the first air passage, so that no exposed seam exists between the first air passage and the annular supporting piece, and the air flowing through the first air passage enters the first air bag through the hollow pipeline of the annular supporting piece to realize the communication between the sealing cavity and the first air bag.
As an embodiment, the air pressure compensation device further includes:
the air bag supporting rod is arranged in the first air bag and fixed at the top of the annular supporting piece so as to shape the first air bag.
In the implementation process, the air bag supporting rod has a shaping effect on the first air bag, and when the first air bag is not inflated, the first air bag cannot fall into a sealing cavity formed by the organ cover through the first air passage.
In another possible implementation, the length of the first balloon is less than the height of the annular strut.
When the first air bag is not inflated, the first air bag can fall into the sealing cavity formed by the organ cover, in the implementation process, the length of the first air bag is smaller than the height of the annular supporting piece, and even if the first air bag is not inflated and is in a falling state, the falling position of the first air bag is only located in the hollow channel of the annular supporting piece, and the sealing cavity formed by the organ cover cannot be influenced.
In one possible implementation, the shape and area of the inner ring of the annular strut is the same as the shape and area of the first airway cross-section, and the inner ring of the annular strut is disposed in alignment with the outlet of the first airway.
In the implementation process, the inner ring of the annular supporting piece is aligned with the outlet of the first air passage, namely the air passage interface between the mounting part and the annular supporting piece is connected smoothly, and when the air in the sealing cavity flows to the first air passage, the air flow passes through smoothly, so that noise is not easy to generate.
As an embodiment, the air pressure compensation device further includes:
the protective cover is arranged on the mounting part and encloses an air bag cavity for accommodating the annular supporting piece and the first air bag together with the mounting part;
the protective cover is provided with a through hole. In one possible implementation, the through holes on the protective cover comprise a uniform arrangement of several fine holes.
In the implementation process, the volume change of the sealing cavity is compensated by the expansion and contraction of the air bag in the first air bag cavity, and a plurality of fine holes are formed in the outer wall of the protective cover and communicated with the outside of the constant force device so as to compensate the influence of the expansion and contraction of the first air bag on the residual air pressure in the air bag cavity.
In one possible implementation, the retractable cover is an organ cover;
the constant pressure output unit comprises a cylinder mounting frame, a telescopic cylinder, a linear bearing assembly and a floating joint;
the cylinder mounting frame comprises a plurality of support columns fixedly connected to the mounting part and a support plate arranged at the lower end parts of the support columns; the telescopic cylinder is arranged on a supporting plate of the cylinder mounting frame;
the linear bearing assembly is mounted on the cylinder mounting frame; the linear bearing assembly comprises a linear bearing arranged on the cylinder mounting frame and a guide post matched with the linear bearing, and the guide post stretches relative to the linear bearing; the guide post is parallel to the moving direction of the piston rod of the telescopic cylinder along the telescopic direction of the linear bearing;
the piston of the telescopic cylinder is connected with a second mounting port through the floating joint; the guide post is connected with the second mounting port through a guide post clamp block arranged on the second mounting port.
In one possible implementation, the mounting portion is provided with a first joint and a second joint;
the second mounting port is provided with a stress device air source connector connected with the stress device;
a first air pipe and a second air pipe are arranged in the telescopic cover body, and the first air pipe is communicated with the first joint and the constant pressure output unit; and the second air pipe is communicated with the second connector and the air source connector of the stress device.
In the implementation process, the first air pipe and the second air pipe are arranged in the sealing cavity, namely, the air source access air passage of the stress device and the air source access air passage of the constant pressure output unit are both arranged in the sealing cavity, and the air source pipeline does not need to be additionally inserted outside the constant force device, so that the constant force device in the embodiment is more compact in structure and more stable in operation.
In one possible implementation manner, a second air passage which is communicated with the sealing cavity and the contractible closed space is arranged on the side wall of the first mounting port, and the air pressure compensation device is arranged independently of the contractible cover body.
In one possible implementation, the second airway includes a rigid conduit; the air pressure compensation device comprises a second air bag which is sleeved and hooped on the end part of the rigid pipeline extending out of the sealing cavity.
According to another aspect of the present invention, there is also provided an abrasive machining apparatus including a mechanical arm, an abrasive head, and a constant force device as described above; the mechanical arm is fixedly connected with a first mounting port in the constant force device, and the grinding head is fixedly connected with a second mounting port.
According to the technical scheme, the sealing cavity where the constant pressure output unit is located is communicated with the sealing cavity, a contractible closed space which is airtight and contractible is formed between the sealing cavity and the sealing cavity, and the air pressure inside the sealing cavity is stable through the contractible characteristics of the contractible closed space, so that the sealing characteristics of the constant pressure output unit are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a constant force device according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a constant force device according to an embodiment of the present disclosure;
FIG. 3 is a top view of the constant force device of FIG. 2;
FIG. 4 is a cross-sectional view taken along the direction A-A of the constant force device of FIG. 2;
FIG. 5 is a schematic view of the constant force device of FIG. 2 without a telescoping shield mounted thereto;
fig. 6 is a simplified schematic diagram of another constant force device shown in an embodiment of the present application.
Icon: 100-a constant pressure output unit; 110-cylinder mounting rack, 111-support column; 112-a support plate; 120-telescopic cylinder, 130-linear bearing assembly; 131-linear bearings; 132-guide posts; 140-floating joint; 200-a retractable cover; 210-a first mounting port; 211-a second airway; 220-a second mounting port; 230-sealing the cavity; 300-air pressure compensation device; 310-ring struts; 311-inner ring through holes; 330-balloon struts; 340-protecting cover; 320-a first balloon; 330-a second balloon; 400-mounting plates; 410-a mounting portion; 411-first airway; 420-extension; 421-flange; 430-a first joint; 440-second joint; 133-guide post clamp block.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships that are conventionally put in use of the product of the application, are merely for convenience of description of the present application and simplification of description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Fig. 1 is a schematic diagram of a constant force device according to an embodiment of the present application. Referring to fig. 1, the constant force apparatus includes a constant pressure output unit 100, a telescopic cover 200, and a pneumatic pressure compensation apparatus 300.
The constant pressure output unit 100 is telescopic for achieving a constant force output.
The telescopic housing 200 is telescopic, and the telescopic housing 200 includes a first mounting port 210, a second mounting port 220, and a sealing chamber 230 for accommodating the constant pressure output unit 100. The first mounting port 210 is connected to an external device; the second mounting port 220 is connected to a force receiving device.
The first and second mounting ports 210 and 220 may be integral parts of the cavity of the seal chamber 230, i.e., the cavity of the seal chamber 230 is in communication with the outside through the first and second mounting ports 210 and 220. When the first mounting port 210 and the second mounting port 220 are components of the cavity of the seal cavity 230, the first mounting port 210 is mounted with an external device, the second mounting port 220 is mounted with a force-receiving device, the external device blocks the first mounting port 210, the force-receiving device blocks the second mounting port 220, and the blocked first mounting port 210 and second mounting port 220 and the cavity of the seal cavity 230 form a closed cavity together. In another possible implementation, the first mounting port 210 and the second mounting port 220 may also be mounted directly at a predetermined location on the outer wall of the seal cavity 230, instead of being part of the seal cavity 230.
The air pressure compensating device 300 includes a contractible airtight space, which is communicated with the sealing cavity 230, and expands and contracts accordingly when the volume of the sealing cavity 230 changes, so as to maintain the air pressure of the sealing cavity 230 stable.
In the above implementation process, the contractible closed space and the interior of the sealing cavity 230 form a closed and stretchable space, and when the constant pressure output unit 100 performs the stretching motion, the internal volume of the sealing cavity 230 changes, and when the internal volume of the sealing cavity 230 increases, the contractible closed space expands; when the internal volume of the seal chamber 230 is reduced, the contractible closed space contracts, so that the air pressure inside the seal chamber 230 is stabilized by the contraction characteristic of the contractible closed space, and the sealing characteristic of the constant pressure output unit 100 is improved.
Fig. 2 is a schematic structural diagram of a constant force device according to an embodiment of the present application. FIG. 3 is a top view of the constant force device of FIG. 2; FIG. 4 is a cross-sectional view taken along the A-A direction of the constant force device of FIG. 2. Referring to fig. 2-4, in this embodiment, the telescoping shield 200 is an organ shield. The first mounting port 210 of the organ cover is connected with an external device, such as a mechanical arm, a mechanical arm and the like; the second mounting port 220 of the organ cover is connected to a force receiving member, such as a grinding head in a grinding apparatus.
As one embodiment, the first mounting port 210 of the retractable cover 200 has a mounting plate 400 mounted thereon, the mounting plate 400 including a mounting portion 410 and an extension portion 420. The mounting portion 410 is mounted above the first mounting port 210, and in this embodiment, the air pressure compensating device 300 is mounted at a position above the mounting portion 410. Correspondingly, the mounting portion 410 is provided with a first air passage 411 communicating the sealing chamber 230 and the contractible airtight space. The extension 420 is disposed away from the organ cover, the extension 420 is configured to be connected to an external device, and correspondingly, a flange 421 for connecting to the external device is disposed on the extension 420.
In the above implementation, the mounting position of the mounting portion 410 in the mounting plate 400 may be the first mounting port 210 or the second mounting port 220, but since the second mounting port 220 is located at the bottom of the telescopic housing 200, and the mounting of the related structures such as the constant pressure output unit 100 needs to be supported by a relatively fixed mounting structure, and at the same time, the bottom of the telescopic housing 200 needs to be connected to a force-bearing component such as a grinding head, the second mounting port 220 is not suitable for providing the mounting portion 410. Meanwhile, in the present embodiment, the mounting portion 410 is disposed at the first mounting port 210, and the mounting portion 410 is located at the middle-upper portion of the constant force device with respect to the telescopic cover 200 and the air pressure compensating device 300, so that the rigidity of the whole constant force device is better.
In one possible implementation, the mounting portion 410 and the extension portion 420 are disposed at an angle.
In the above implementation process, the extension portion 420 is obliquely arranged relative to the mounting portion 410, and has a position relationship with the 180-degree angular range between the extension portion 420 and the mounting portion 410, and the inclination of the extension portion 420 can increase the range of the included angle between the extension portion 420 and the mounting portion 410, so that the extension portion 420 has more installation reserved space. The installation space of the extension 420 increases and it is more convenient to connect with an external device.
In one possible implementation, the air pressure compensating device 300 includes an annular support 310 and a first air bladder 320. The annular stay 310 is disposed at a side of the mounting portion 410 remote from the seal chamber 230, and the inner ring through hole 311 of the annular stay 310 covers the outlet of the first air passage 411. The first balloon 320 is sleeved and tightened around the upper middle periphery of the annular stay 310.
In the above implementation process, the inner ring through hole 311 of the annular support 310 covers the outlet of the first air passage 411, so that no exposed seam exists between the first air passage 411 and the annular support 310, and the air flowing through the first air passage 411 enters the first air bag 320 through the hollow pipe of the annular support 310, so as to realize the communication between the sealing cavity 230 and the first air bag 320.
As one embodiment, the air pressure compensating device 300 further includes an air bag stay 330. The balloon stay 330 is disposed inside the first balloon 320 and is fixed on top of the ring stay 310. The balloon strut 330 expands the inner wall of the first balloon 320 to a position away from the first gas passage 411.
In the above implementation, the air bag stay 330 has a shaping effect on the first air bag 320, so that the first air bag 320 does not fall into the sealing cavity 230 formed by the organ cover through the first air passage 411 when not expanding.
In another possible implementation, the length of the first balloon 320 is less than the height of the annular strut 310.
When the first airbag 320 is not inflated, the first airbag 320 may drop into the sealed cavity 230 formed by the organ cover, and in the above implementation, the length of the first airbag 320 is smaller than the height of the annular supporting member 310, and even if the first airbag 320 is not inflated and is in a dropped state, the dropped position of the first airbag 320 is only located in the hollow channel of the annular supporting member 310, so that the sealed cavity 230 formed by the organ cover is not affected.
In one possible implementation, the shape and area of the inner ring through hole 311 are the same as the shape and area of the cross section of the first air passage 411, and the outlets of the inner ring through hole 311 and the first air passage 411 are disposed in alignment.
In the above implementation process, the inner ring through hole 311 is aligned with the outlet of the first air passage 411, that is, the air passage interface between the mounting portion 410 and the annular supporting member 310 is smoothly connected, when the air in the sealing cavity 230 flows toward the first air bag 320, the air flow is smoother, and noise is not easy to generate.
As an embodiment, the air pressure compensating device 300 further includes a protective cover 340. The protective cover 340 is disposed on the mounting portion 410, and encloses an air bag cavity with the mounting portion 410 for accommodating the annular stay 310 and the first air bag 320.
In the above implementation, the protection cover 340 is provided to protect the first airbag 320 from breakage, and the external appearance of the constant force device. In one possible implementation, the outer shape of the protective cover 340 is a hollow cylinder, and the outer diameter of the protective cover 340 is the same as the outer diameter of the organ cover.
Further, the protection cover 340 is provided with a through hole. In one possible implementation, the through holes on the protective cover 340 include a plurality of fine holes (not shown) that are uniformly aligned.
In the above implementation process, the volume change of the sealing chamber 230 is compensated by the expansion and contraction of the air bag in the chamber of the first air bag 320, and the outer wall of the protecting cover 340 is provided with a plurality of fine holes communicated with the outside of the constant force device, so as to compensate the influence of the expansion and contraction of the first air bag 320 on the residual air pressure in the chamber of the air bag.
In one possible implementation, the mounting portion 410 is provided with a first connector 430 and a second connector 440. The mounting portion 410 is provided therein with a duct communicating with the first joint 430 and the second joint 440. The second mounting port 220 is fitted with a force device air source connection to the force device. The inside of the telescopic hood 200 is provided with a first air pipe and a second air pipe. The first gas pipe communicates the first joint 430 with the constant pressure output unit 100; the second air tube communicates the second connector 440 with the forced device air source connector.
In the above implementation process, the first air pipe and the second air pipe are disposed in the sealing cavity 230, that is, the air source access air path of the stress device and the air source access air path of the constant pressure output unit 100 are both disposed in the sealing cavity 230, and the air source pipeline does not need to be additionally inserted outside the constant force device, so that the constant force device in the embodiment is more compact in structure and more stable in operation.
FIG. 5 is a schematic view of the constant force device of FIG. 2 without the telescoping shield mounted. Referring to fig. 4 and 5, the constant pressure output unit 100 in this embodiment includes a cylinder mount 110, a telescopic cylinder 120, a linear bearing assembly 130, and a floating joint 140.
The cylinder mount 110 is fixedly mounted on the mounting portion 410 of the mounting plate 400. In one possible implementation, the cylinder mount 110 includes a plurality of support columns 111 fixedly coupled to the mounting portion 410, and a support plate 112 mounted at lower ends of the plurality of support columns 111.
The telescopic cylinder 120 is mounted on the support plate 112 of the cylinder mount 110.
The linear bearing assembly 130 is mounted on the cylinder mount 110. In one possible implementation, the linear bearing assembly 130 includes a linear bearing 131 mounted on the cylinder mount 110, a guide post 132 mated with the linear bearing 131, the guide post 132 telescoping relative to the linear bearing 131. The guide post 132 is parallel to the moving direction of the piston rod of the telescopic cylinder 120 along the telescopic direction of the linear bearing 131.
The piston of the telescopic cylinder 120 is connected with the second mounting port 220 through the floating joint 140, and the guide post 132 of the linear bearing 131 assembly 130 is connected with the second mounting port 220 through the guide post clamp block 133 arranged on the second mounting port 220.
In the above implementation process, the second mounting port 220 will generate a position movement under the influence of the force-bearing device, the second mounting port 220 moves up and down along the guide post 132, the piston of the telescopic cylinder 120 moves synchronously, the volume of the cylinder increases or decreases accordingly, and the air pressure in the sealing cavity 230 also changes accordingly.
It should be noted that the structure of the constant pressure output unit 100 in this embodiment is only exemplary, and any device that can be connected to the second mounting port 220 and provide a constant force output when the second mounting port 220 moves in position falls within the scope of the present application.
Fig. 6 is a simplified schematic diagram of another constant force device shown in an embodiment of the present application. As shown in fig. 6, a second air passage 211 communicating the sealing chamber 230 and the contractible closed space is provided on the side wall of the first mounting port 210 of the retractable cover body, and the air pressure compensating device 300 is provided independently of the retractable cover body 200. The second airway 211 comprises a rigid conduit; the air pressure compensating device 300 includes a second bladder 330, the second bladder 330 being sleeved and tightened around the end of the rigid tube that extends beyond the sealed cavity 230.
According to the technical scheme, the sealing cavity where the constant pressure output unit is located is communicated with the sealing cavity, a contractible closed space which is airtight and contractible is formed between the sealing cavity and the sealing cavity, and the air pressure inside the sealing cavity is stable through the contractible characteristics of the contractible closed space, so that the sealing characteristics of the constant pressure output unit are improved.
According to the embodiment of the application, 6 constant force devices are selected for carrying out a constant force output experiment, and the service life of the device in a dust environment (the hazard degree of a dust operation place is II level) where a ceramic blank (commonly called as a green blank) is polished is prolonged. Wherein, the dynamometer is installed and is used for being connected with the second installation port department of atress device.
Experimental data are shown in table 1-1: (note: constant force control output 30N)
TABLE 1-1 constant force output experiments and device life test results
According to the experimental data, the constant force device has stable output force and service life of 10000h (obtained by an accelerated aging test).
According to another aspect of the embodiment of the invention, there is also provided an abrasive machining apparatus including a mechanical arm, an abrasive head, and the constant force device described above. The mechanical arm is fixedly connected with a first mounting port in the constant force device, and the grinding head is fixedly connected with a second mounting port.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. A constant force device, comprising:
the constant pressure output unit is used for realizing constant force output;
the telescopic cover body comprises a first mounting port connected with an external device, a second mounting port connected with a stress device and a sealing cavity for accommodating the constant pressure output unit;
the air pressure compensation device comprises a contractible closed space, wherein the contractible closed space is communicated with the sealing cavity and is used for maintaining the air pressure of the sealing cavity to be stable when the volume of the sealing cavity changes;
the device also comprises a mounting plate, wherein the mounting plate comprises a mounting part and an extension part;
the mounting part is mounted on the first mounting port; the mounting part is provided with a first air passage which is communicated with the sealing cavity and the contractible airtight space;
the extension is provided with a flange connected with the external device;
the air pressure compensation device includes:
the annular supporting piece is arranged on the side, away from the sealing cavity, of the mounting part, and an inner annular through hole of the annular supporting piece covers the outlet of the first air passage;
the first air bag is sleeved and hooped on the periphery of the upper middle part of the annular supporting piece;
the air pressure compensation device further includes:
the air bag supporting rod is arranged in the first air bag and fixed at the top of the annular supporting piece so as to shape the first air bag.
2. The constant force device of claim 1, wherein the mounting portion and the extension portion are disposed at an angle.
3. The constant force device of claim 1, wherein a length of the first balloon is less than a height of the annular strut.
4. The constant force device of claim 1, wherein the shape and area of the inner ring of the annular strut is the same as the shape and area of the first airway cross-section, and the inner ring of the annular strut is aligned with the outlet of the first airway.
5. The constant force device of any one of claims 1 to 4, wherein the air pressure compensation device further comprises:
the protective cover is arranged on the mounting part and encloses an air bag cavity for accommodating the annular supporting piece and the first air bag together with the mounting part;
the protective cover is provided with a through hole.
6. The constant force device of claim 1, wherein the telescoping shield is an organ shield;
the constant pressure output unit comprises a cylinder mounting frame, a telescopic cylinder, a linear bearing assembly and a floating joint;
the cylinder mounting frame comprises a plurality of support columns fixedly connected to the mounting part and a support plate arranged at the lower end parts of the support columns; the telescopic cylinder is arranged on a supporting plate of the cylinder mounting frame;
the linear bearing assembly is mounted on the cylinder mounting frame; the linear bearing assembly comprises a linear bearing arranged on the cylinder mounting frame and a guide post matched with the linear bearing, and the guide post stretches relative to the linear bearing; the guide post is parallel to the moving direction of the piston rod of the telescopic cylinder along the telescopic direction of the linear bearing;
the piston of the telescopic cylinder is connected with a second mounting port through the floating joint; the guide post is connected with the second mounting port through a guide post clamp block arranged on the second mounting port.
7. The constant force device of claim 1, wherein the mounting portion has a first joint and a second joint;
the second mounting port is provided with a stress device air source connector connected with the stress device;
a first air pipe and a second air pipe are arranged in the telescopic cover body, and the first air pipe is communicated with the first joint and the constant pressure output unit; and the second air pipe is communicated with the second connector and the air source connector of the stress device.
8. The constant force device of claim 1, wherein a second air passage is provided in a side wall of the first mounting port to communicate the sealed cavity and the contractible enclosure, and wherein the air pressure compensation device is provided independently of the flexible cover.
9. The constant force device of claim 8, wherein the second airway comprises a rigid conduit; the air pressure compensation device comprises a second air bag which is sleeved and hooped on the end part of the rigid pipeline extending out of the sealing cavity.
10. An abrasive machining apparatus comprising a mechanical arm, an abrasive head, and the constant force device of any one of claims 1 to 9; the mechanical arm is fixedly connected with a first mounting port in the constant force device, and the grinding head is fixedly connected with a second mounting port.
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