CN110065002A - Valve block angular surface grinding tooling - Google Patents
Valve block angular surface grinding tooling Download PDFInfo
- Publication number
- CN110065002A CN110065002A CN201910306931.7A CN201910306931A CN110065002A CN 110065002 A CN110065002 A CN 110065002A CN 201910306931 A CN201910306931 A CN 201910306931A CN 110065002 A CN110065002 A CN 110065002A
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- China
- Prior art keywords
- valve block
- sucking disk
- fixing sucking
- sucker
- rotation
- Prior art date
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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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention discloses a kind of valve block angular surface grinding tooling, the technical issues of solution: the technical issues of fixation valve block tooling needed for the finishing grinding mentioned in the background art lacked in the prior art to valve block ramp.The technical solution taken, a kind of valve block angular surface grinding tooling, including fixing sucking disk and the rotation sucker being rotatably arranged on fixing sucking disk, fixing sucking disk is alternately arranged by multiple first cuboid magnetic conductive boards and multiple non magnetic gaskets of first cuboid and is made of two stay-bolt fixations；Rotation sucker is alternately arranged by the second cuboid magnetic conductive board and multiple non magnetic gaskets of second cuboid and forms advantage: this valve block angular surface grinding tooling by two stay-bolt fixations, the rotation sucker being parallel to each other using top and bottom drives a pair of of valve block whole around following inclination fixing sucking disk center rotating 180 degree, it avoids directly rotating and single valve block is installed, improve positioning accuracy and processing efficiency.
Description
Technical field
The present invention relates to a kind of grinding fixture, specially a kind of valve block angular surface grinding tooling.
Background technique
Rock drilling equipment demolishes firm or cement works, exploitation clay etc., rock drilling equipment is again with pneumatic for smashing soft mineral
Based on drilling tool, distribution component is the important component of pneumatic tools.
Valve block is a kind of one of pneumatic tools pneumatic pick distribution form key part.The element precision requires height, especially
It is the flatness on its two inclined-planes and the depth of parallelism and symmetry of two crest lines, the performance of product is influenced greatly, inclined-plane
Finishing is ground, and it is most important to design suitable grinding technological equipment.
Summary of the invention
The technical problem to be solved by the present invention is to mentioned in the background art to lack in the prior art on valve block
The technical issues of fixation valve block tooling needed for the finishing grinding on inclined-plane.
The technical solution used in the present invention is: a kind of valve block angular surface grinding tooling, including fixing sucking disk (10) and rotation
The rotation sucker (20) being arranged on fixing sucking disk (10),
Fixing sucking disk (10) uses the first cuboid magnetic conductive board (11) and multiple uses made of magnetic conductive material multiple
The non magnetic gasket of first cuboid (12) made of non-permeable material is alternately arranged and by the fixed group of two stay-bolts (18)
At；
Fixing sucking disk (10) lower surface is horizontal plane, there is an inclination between the upper surface and lower surface of fixing sucking disk (10)
Angle a；Tilt angle a is the inclination angle of valve block ramp to be processed, and the geometric center position in fixing sucking disk (10) upper surface is perpendicular
It is straight that central axis (13) are set, the bearing (14) of setting and rotation sucker (20) rotation connection on central axis (13), in fixing sucking disk
(10) one end is vertically arranged with the bulb loose pin (17) with rotation sucker (20) positioning；
It rotates sucker (20) and uses the second cuboid magnetic conductive board (21) and multiple uses made of magnetic conductive material multiple
The non magnetic gasket of second cuboid (22) made of non-permeable material is alternately arranged and by the fixed group of two stay-bolts (18)
At；
The upper surface for rotating sucker (20) is parallel with lower surface, in rotation sucker (20) lower surface fitting fixing sucking disk (10)
Surface setting, corresponding shaft bearing (14) indent setting rotation slot (23) on rotation sucker (20) lower surface, rotation slot (23) cell wall
It is equipped with bearing (14) outer ring；
Interval setting is multiple for installing the positioning pin (24) of valve block on rotation sucker (20) upper surface, and each adjacent two is fixed
Position pin (24) one valve block (30) of corresponding installation；Two lateral shallow slots (25) are symmetrical arranged in the surrounding of each positioning pin (24).
To the preferred of technical solution of the present invention, central axis (13) is inserted vertically into the axis hole on fixing sucking disk (10), center
Axis (13) and axis hole are interference fitted.
To the preferred of technical solution of the present invention, the pin axis of bulb loose pin (17) and the axis of central axis (13) are total
Face guarantees the balance of tooling entirety.
To the preferred of technical solution of the present invention, bulb loose pin (17) is inserted up by the following table of fixing sucking disk (10)
In the pin shaft hole for entering fixing sucking disk (10) setting, the bulb end of bulb loose pin (17) is located at the upper table of fixing sucking disk (10)
Pressure spring (16) are arranged in the lower end in face, bulb loose pin (17), and pressure spring (16) is pressed on fixing sucking disk by plug screw (15)
(10) in pin shaft hole；Bulb loose pin (17), which is located on the pin shaft at bulb end, to be arranged for preventing bulb loose pin
(17) positioning step popped up under the action of pressure spring (16).
To the preferred of technical solution of the present invention, it is perforative vertical that a both ends are arranged in indent on rotation sucker (20) upper surface
To shallow slot (26), all positioning pins (24) are arranged at the slot bottom of longitudinal shallow slot (26).The setting of longitudinal shallow slot (26) is mainly used
Clean iron filings are difficult to clean off in 24 root of holding locating pin.
To the preferred of technical solution of the present invention, longitudinal shallow slot (26) is located at the position of center line of rotation sucker (20) upper surface
On.
To the preferred of technical solution of the present invention, all positioning pins (24) are inserted into determining for rotation sucker (20) upper surface setting
In the pin shaft hole of position, positioning pin (24) and positioning pin axis hole are interference fitted；It is fixed positioned at rotation sucker (20) upper surface outermost two
Position pin shaft hole be through-hole and as it is position with fixing sucking disk (10) and for the bulb of bulb loose pin (17) be inserted into determine
Position hole.
To the preferred of technical solution of the present invention, the ruler of the first cuboid magnetic conductive board (11) and the second cuboid magnetic conductive board (21)
Very little identical and quantity is equal, and the non magnetic gasket of the first cuboid (12) is identical with the size of the non magnetic gasket of the second cuboid (22)
And quantity is equal.
To the preferred of technical solution of the present invention, the both ends of stay-bolt (18) all pass through nut locking.
To the preferred of technical solution of the present invention, magnetic conductive material is armos iron block, non-permeable material be lead, copper,
Brass or babbit.
Valve block angular surface grinding tooling is placed in the centre bit of the magnetic worktable of surface grinding machine by the use of tooling of the present invention
It sets, keeps the magnetic conductive material in tooling corresponding with magnetic worktable, keep rotation sucker 20 parallel with fixing sucking disk 10, it is solid at this time
The bulb loose pin 17 determined on sucker 10 is corresponding with the positioning pin axis hole on rotation sucker 20.The upper table of sucker 20 will be rotated
Face is cleaned out, and valve block 30 is mounted on rotation 20 upper surface of sucker；Open the magnechuck power supply on surface grinding machine, electromagnetic force
Valve block and the absorption of valve block angular surface grinding tooling are fixed.
The surface grinding machine used in the present invention is outsourcing piece.
The beneficial effects of the present invention are:
1, this valve block angular surface grinding tooling carries out location and installation to valve block using rotation sucker and one group of positioning pin, uses
Electromagnetic adsorption power clamping tool and valve block to be processed on electromagnetic chuck of grinder, it is easy installation and reliable.
2, this valve block angular surface grinding tooling, the rotation sucker being parallel to each other using top and bottom drive a pair of of valve block whole under
The inclination fixing sucking disk center rotating 180 degree in face avoids directly rotating and installs single valve block, improves positioning accuracy and processing effect
Rate.
Detailed description of the invention
Fig. 1 is the total figure (being mounted with four valve blocks on rotation sucker in figure) of valve block angular surface grinding tooling.
Fig. 2 is the total figure that the valve block angular surface grinding tooling that sucker turns after 180 ° is rotated in Fig. 1.
Fig. 3 is the schematic diagram of valve block.
Fig. 4 is the structure chart (in figure one end cutting and illustrate bulb loose pin) of fixing sucking disk.
Fig. 5 is the structure chart (in figure in middle position cutting and illustrate centre bore) for rotating sucker.
Fig. 6 is that the side view of valve block angular surface grinding tooling (illustrates inclination angle a) in figure.
Specific embodiment
Technical solution of the present invention is described in detail below, but protection scope of the present invention is not limited to the implementation
Example.
To keep the contents of the present invention more obvious and easy to understand, done further below in conjunction with attached drawing 1- Fig. 6 and specific embodiment
Description.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
As shown in figure 3, distribution key part of the valve block 30 as pneumatic tools pneumatic pick, required precision is high, especially it
Two inclined-planes flatness and two crest lines the depth of parallelism and symmetry, the performance of product is influenced very big.
As shown in figure 3, valve block 30 is in disc-shaped, pin hole 36 and open slot 32, pin hole 36 and open slot are provided on valve block 30
32 cooperate with 24 small―gap suture of positioning pin respectively；30 upper surface 34 of valve block is parallel with another side, 32 line of pin hole 36 and open slot
Two sides processing respectively has inclined-plane: the first inclined-plane 31 and the second inclined-plane 33, crest line 35 are the intersecting lenses on two inclined-planes Yu upper surface 34；?
The outer edge on one inclined-plane 31 is provided with long arc gap, and the outer edge on the second inclined-plane 33 is provided with short arc gap, two arc notch
As gas distribution channels.
As shown in fig. 6, valve block 30 is mounted on rotation 20 upper surface of sucker by pin hole 36 and open slot 32.
As illustrated in fig. 1 and 2, valve block angular surface grinding tooling, including fixing sucking disk 10 and be rotatably arranged on fixing sucking disk 10
Rotation sucker 20.
As shown in figs. 4 and 6, fixing sucking disk 10 uses 11 He of the first cuboid magnetic conductive board made of magnetic conductive material multiple
It is multiple to be alternately arranged and consolidated by two stay-bolts 18 using the non magnetic gasket 12 of the first cuboid made of non-permeable material
Fixed composition.Two 18 both ends of stay-bolt all pass through nut locking.Magnetic conductive material is armos iron block, non-permeable material
For lead, copper, brass or babbit.
The width of the first cuboid magnetic conductive board 11 and the non magnetic gasket 12 of the first cuboid in the present embodiment all with grinding machine
The mating suction iron equivalent width with magnechuck.
As shown in fig. 6,10 lower surface of fixing sucking disk is horizontal plane, have one between the upper surface and lower surface of fixing sucking disk 10
A tilt angle a；Tilt angle a is the inclination angle of 30 ramp of valve block to be processed, the geometric center in 10 upper surface of fixing sucking disk
Position is vertically arranged central axis 13, and central axis 13 is inserted vertically into the axis hole on fixing sucking disk 10, central axis 13 and axis hole interference
Cooperation.On central axis 13 be arranged with rotation sucker 20 be rotatablely connected bearing 14,10 one end of fixing sucking disk be vertically arranged with
The bulb loose pin 17 that sucker 20 positions is rotated, the pin axis of bulb loose pin 17 and the axis of central axis 13 are total
Face guarantees the balance of tooling entirety.Determine with the most left and right sides on rotation sucker 20 is in the position of bulb loose pin 17
Positioning pin axis hole corresponding to the pin 24 of position is corresponding.
It is arranged as shown in figure 4, bulb loose pin 17 is inserted into fixing sucking disk 10 by the following table of fixing sucking disk 10 up
Pin shaft hole in, the bulb end of bulb loose pin 17 is located at the upper surface of fixing sucking disk 10, bulb loose pin 17
Pressure spring 16 is arranged in lower end, and pressure spring 16 is pressed in the pin shaft hole of fixing sucking disk 10 by plug screw 15；Bulb loose pin 17
In positioning step of the setting for preventing bulb loose pin 17 from popping up under the action of pressure spring 16 on the pin shaft at bulb end.
As it can be seen in figures 5 and 6, rotation sucker 20 uses 21 He of the second cuboid magnetic conductive board made of magnetic conductive material multiple
It is multiple to be alternately arranged and consolidated by two stay-bolts 18 using the non magnetic gasket 22 of the second cuboid made of non-permeable material
Fixed composition, the both ends of stay-bolt 18 all pass through nut locking.Magnetic conductive material is armos iron block, and non-permeable material is
Copper sheet or aluminium sheet.Second cuboid magnetic conductive board 21 is identical with the size of the first cuboid magnetic conductive board 11 and quantity is equal, and second is long
The non magnetic gasket 22 of cube is identical with the size of the non magnetic gasket 12 of the first cuboid and quantity is equal.
As shown in fig. 6, the upper surface of rotation sucker 20 is parallel with lower surface, rotation 20 lower surface of sucker is bonded fixing sucking disk
The setting of 10 upper surfaces, rotation slot 23,23 cell wall of rotation slot and axis is arranged in 14 indent of corresponding shaft bearing on rotation 20 lower surface of sucker
14 outer rings are held to be equipped with.
As shown in figure 5, interval setting is multiple for installing the positioning pin 24 of valve block on rotation 20 upper surface of sucker, per adjacent
Two one valve blocks 30 of corresponding installation of positioning pin 24.Rotation sucker 30 drives multiple valve blocks 30 whole around the fixed suction of following inclination
10 center rotating 180 degree of disk avoids directly rotating and installs single valve block, improves positioning accuracy and processing efficiency.
As shown in figure 5, all positioning pins 24 are inserted into the positioning pin axis hole of rotation 20 upper surface of sucker setting, positioning pin
24 are interference fitted with positioning pin axis hole；Positioned at rotation 20 upper surface outermost of sucker, two positioning pin axis holes be through-hole and as with
Location hole that fixing sucking disk 10 positions and for the insertion of the bulb of bulb loose pin 17.
As shown in figure 5, the surrounding in each positioning pin 24 is symmetrical arranged two lateral shallow slots 25, lateral 25 one end of shallow slot is passed through
It wears, lateral shallow slot 25 is used to insert the spacing of tool institute when taking out valve block 30 from the upper surface of rotation sucker 20.
As shown in figure 5, the perforative longitudinal shallow slot 26, Suo Youding in a both ends is arranged in indent on rotation 20 upper surface of sucker
Position pin 24 is arranged at the slot bottom of longitudinal shallow slot 26.The setting of longitudinal shallow slot 26 is mainly used for 24 root of holding locating pin and is difficult to clearly
Except clean iron filings.Longitudinal shallow slot 26 is located on the position of center line of rotation 20 upper surface of sucker.
Valve block angular surface grinding tooling is placed in the magnetic worktable of surface grinding machine by the course of work of the present embodiment tooling
Heart position keeps the magnetic conductive material in tooling corresponding with magnetic worktable, keeps rotation sucker 20 parallel with fixing sucking disk 10, this
When fixing sucking disk 10 on bulb loose pin 17 with rotation sucker 20 on positioning pin axis hole it is corresponding.Sucker 20 will be rotated
Upper surface is cleaned out, and valve block 30 is mounted on rotation 20 upper surface of sucker；Open the magnechuck power supply on surface grinding machine, electricity
Magnetic force fixes valve block and the absorption of valve block angular surface grinding tooling.
Start grinding machine, opens coolant liquid, the inclined-plane of 30 side of valve block is ground, after meeting size, exits grinding.
Magnechuck power supply is truncated, rotation sucker 20 is rotated into 180 degree (see Fig. 2), opens magnechuck power supply, electromagnetic force
Valve block and valve block angular surface grinding tooling are adsorbed into fixation again.
It is again started up grinding machine, the inclined-plane of the valve block other side is ground, after meeting size, exits grinding.Truncation electricity
Magnetic-disc power supply is taken out valve block from the upper surface of rotation sucker 20 using tool.The upper surface cleaning for rotating sucker 20 is dry
Only, it is reinstalled another group of valve block.
Continue next actuation cycle.
Surface grinding machine in the present embodiment is that the M7132 horizontal axis of Yancheng City great Feng Qu Junfeng Machine Manufacture factory sale is flat away from platform
Face grinding machine.
The present embodiment valve block angular surface grinding tooling carries out location and installation to valve block using rotation sucker and one group of positioning pin,
Workpiece is clamped with electromagnetic adsorption power, it is easy installation and reliable.A pair of of valve block is driven using the rotation sucker that top and bottom are parallel to each other
Entirety avoids directly rotating and installs single valve block, improve positioning accuracy around following inclination fixing sucking disk center rotating 180 degree
And processing efficiency, efficiently solve the corresponding positioning in original technology when the pin hole and variant open slot size on valve block
Two pin size differences when, the installation site of each pair of positioning pin will do different arrangements in this row's positioning pin, to the later period
It operates more troublesome.
What is be not specifically noted in all description of the invention is the prior art or can be realized by existing technology,
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description, and it is all this
A little modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of valve block angular surface grinding tooling, it is characterised in that: including fixing sucking disk (10) and be rotatably arranged on fixing sucking disk
(10) the rotation sucker (20) on,
Fixing sucking disk (10) is multiple using the first cuboid magnetic conductive board (11) made of magnetic conductive materials and multiple uses are non-leads
The non magnetic gasket of first cuboid (12) made of magnetic material is alternately arranged and is made of two stay-bolt (18) fixations；
Fixing sucking disk (10) lower surface is horizontal plane, there is a tilt angle between the upper surface and lower surface of fixing sucking disk (10)
a；Tilt angle a is the inclination angle of valve block ramp to be processed, is set vertically in the geometric center position of fixing sucking disk (10) upper surface
It sets central axis (13), the bearing (14) with rotation sucker (20) rotation connection is set on central axis (13), in fixing sucking disk (10)
One end is vertically arranged with the bulb loose pin (17) with rotation sucker (20) positioning；
Rotation sucker (20) is multiple using second cuboid magnetic conductive board (21) made of magnetic conductive materials and multiple uses are non-leads
The non magnetic gasket of second cuboid (22) made of magnetic material is alternately arranged and is made of two stay-bolt (18) fixations；
The upper surface for rotating sucker (20) is parallel with lower surface, and rotation sucker (20) lower surface is bonded fixing sucking disk (10) upper surface
Setting, corresponding shaft bearing (14) indent setting rotation slot (23), rotation slot (23) cell wall and axis on rotation sucker (20) lower surface
(14) outer ring is held to be equipped with；
Interval setting is multiple for installing the positioning pin (24) of valve block, each adjacent two positioning pin on rotation sucker (20) upper surface
(24) one valve block (30) of corresponding installation；Two lateral shallow slots (25) are symmetrical arranged in the surrounding of each positioning pin (24).
2. valve block angular surface grinding tooling according to claim 1, which is characterized in that central axis (13) is inserted vertically into fixed suction
In axis hole on disk (10), central axis (13) and axis hole are interference fitted.
3. valve block angular surface grinding tooling according to claim 1, which is characterized in that the pin shaft of bulb loose pin (17)
The axis co-planar of line and central axis (13).
4. valve block angular surface grinding tooling according to claim 1, which is characterized in that bulb loose pin (17) is by fixing
The following table of sucker (10) is inserted into up in the pin shaft hole of fixing sucking disk (10) setting, the bulb end of bulb loose pin (17)
Positioned at the upper surface of fixing sucking disk (10), pressure spring (16) are arranged in the lower end of bulb loose pin (17), and pressure spring (16) passes through spiral shell
Plug (15) is pressed in the pin shaft hole of fixing sucking disk (10)；Bulb loose pin (17), which is located to be arranged on the pin shaft at bulb end, to be used
In the positioning step for preventing bulb loose pin (17) from popping up under the action of pressure spring (16).
5. valve block angular surface grinding tooling according to claim 1, which is characterized in that on rotation sucker (20) upper surface
Recessed to set the perforative longitudinal shallow slot (26) in a both ends, all positioning pins (24) are arranged at the slot bottom of longitudinal shallow slot (26).
6. valve block angular surface grinding tooling according to claim 6, which is characterized in that longitudinal shallow slot (26) is located at rotation sucker
(20) on the position of center line of upper surface.
7. valve block angular surface grinding tooling according to claim 1, which is characterized in that all positioning pins (24) are inserted into rotation
In the positioning pin axis hole of sucker (20) upper surface setting, positioning pin (24) and positioning pin axis hole are interference fitted；Positioned at rotation sucker
(20) two positioning pin axis holes of upper surface outermost be through-hole and as it is position with fixing sucking disk (10) and for bulb activity determine
The location hole of the bulb insertion of position pin (17).
8. valve block angular surface grinding tooling according to claim 1, which is characterized in that the first cuboid magnetic conductive board (11) and
The size of two cuboid magnetic conductive boards (21) is identical and quantity is equal, and the non magnetic gasket of the first cuboid (12) and the second cuboid are non-
The size of magnetic gasket (22) is identical and quantity is equal.
9. valve block angular surface grinding tooling according to claim 1, which is characterized in that the both ends of stay-bolt (18) all pass through
Nut locking.
10. valve block angular surface grinding tooling according to claim 1, which is characterized in that magnetic conductive material is armos iron
Block, non-permeable material are lead, copper, brass or babbit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910306931.7A CN110065002B (en) | 2019-04-17 | 2019-04-17 | Valve block inclined plane grinding frock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910306931.7A CN110065002B (en) | 2019-04-17 | 2019-04-17 | Valve block inclined plane grinding frock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110065002A true CN110065002A (en) | 2019-07-30 |
| CN110065002B CN110065002B (en) | 2020-10-16 |
Family
ID=67367961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910306931.7A Active CN110065002B (en) | 2019-04-17 | 2019-04-17 | Valve block inclined plane grinding frock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110065002B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110228012A (en) * | 2019-07-10 | 2019-09-13 | 哈尔滨电气动力装备有限公司 | Bearing thrust watt water inlet covering of the fan is ground positioning clamping fixture |
| CN111660359A (en) * | 2020-06-24 | 2020-09-15 | 四川省绵阳市鸿永盛模塑有限公司 | Membrane fine cutting positioning device and using method |
| CN113681464A (en) * | 2021-07-27 | 2021-11-23 | 山东常林机械集团股份有限公司 | Inclined plate part plane grinding clamping device and method |
| CN113910039A (en) * | 2021-10-18 | 2022-01-11 | 合肥安信瑞德精密制造有限公司 | Circular valve block cut surface grinding device |
| CN116765990A (en) * | 2023-06-13 | 2023-09-19 | 江苏维福特科技发展股份有限公司 | Plane grinding device for valve sheet of plunger pump |
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| CN113681464A (en) * | 2021-07-27 | 2021-11-23 | 山东常林机械集团股份有限公司 | Inclined plate part plane grinding clamping device and method |
| CN113910039A (en) * | 2021-10-18 | 2022-01-11 | 合肥安信瑞德精密制造有限公司 | Circular valve block cut surface grinding device |
| CN113910039B (en) * | 2021-10-18 | 2023-09-15 | 合肥安信瑞德精密制造有限公司 | Circular valve block section grinding device |
| CN116765990A (en) * | 2023-06-13 | 2023-09-19 | 江苏维福特科技发展股份有限公司 | Plane grinding device for valve sheet of plunger pump |
| CN116765990B (en) * | 2023-06-13 | 2024-01-19 | 江苏维福特科技发展股份有限公司 | Plane grinding device for valve sheet of plunger pump |
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