CN208374873U - A kind of metal plate cutting device of Furniture manufacturing - Google Patents

Abstract

The utility model relates to the technical fields of furniture process equipment, specifically disclose a kind of metal plate cutting device of Furniture manufacturing, including cutting bed, movable block is slidably connected on cutting bed, and fixed mechanism, the slide plate that the top of cutting bed is equipped with the first cylinder body and can slide are installed on movable block, stepper motor, sparge pipe and connecting rod are installed on slide plate, the output end of stepper motor is connected with cutter plate, and first piston is slidably connected in the first cylinder body, and connecting rod is connect with first piston；Fluid reservoir is installed by cutting bed, cutting fluid is filled in fluid reservoir and cylinder body, the first cylinder body is communicated with out liquid hose, and liquid hose and sparge pipe are connected out；The lower section of cutter plate is equipped with accumulator tank, is fixedly connected with strainer in accumulator tank, spongy layer is placed on strainer, return pipe is communicated between accumulator tank and fluid reservoir.The utility model can recycle cutting fluid in real time, avoid the waste of cutting fluid, reduce the cutting cost of sheet metal, while avoid pollution environment.

Description

A kind of metal plate cutting device of Furniture manufacturing

Technical field

The utility model relates to the technical fields of furniture process equipment, specifically disclose a kind of metal plate of Furniture manufacturing Material cutter device.

Background technique

Metal furniture be using metal pipe material, plate or rod material etc. as body frame structure, be equipped with timber, all kinds of wood-based plates, glass, The furniture of the manufactures such as test plate (panel) and the iron skill furniture made completely by metal material.In recent years, due to the great individual character wind of metal furniture It adopts, so that household style diversification and more rich in sense of modernness, therefore, metal furniture is increasingly had been favored by people.

In the manufacturing process of metal furniture, can by metal pipe material, plate or rod material by cutting, bending, welding and The processing technologys such as japanning are fabricated to various moulding.And when being cut to sheet metal, due to cutting tool and sheet metal Between high-speed friction make the cut place temperature of sheet metal increase, cause cut place sheet metal easily deformation occurs, because This, it will usually in the cut place of sheet metal, sprinkling cutting fluid is to cool down.But existing sheet metal cutting equipment exists The problem of be: after cutting fluid is sprayed on sheet metal by the cooling body in cutting equipment, cutting fluid cannot be recycled, Pollution of the cutting fluid to environment is not only resulted in this way, also will cause the waste of cutting fluid, so that the processing cost of sheet metal Increase.

Utility model content

The utility model is intended to provide a kind of metal plate cutting device of Furniture manufacturing, to solve existing metal plate There are problems that cutting fluid waste in material cutting equipment.

In order to achieve the above object, a kind of base case of the utility model are as follows: sheet metal cutting of Furniture manufacturing Device, including cutting bed, level slidably connects movable block on the cutting bed, is equipped on movable block for fixed metal plate The fixed mechanism of material, cutting bed are fixedly connected with pillar far from one end of movable block, and the top of pillar is fixedly connected with top plate, top The basal sliding of plate is connected with slide plate, and stepper motor is fixedly installed on slide plate, and the output end of stepper motor is fixedly and coaxially connected There is the cutter plate for cutting sheet metal, sparge pipe and connecting rod is fixedly installed on the slide plate, sparge pipe is far from slide plate One end towards the bottom end of cutter plate, the bottom of the top plate is fixedly installed with the first cylinder body, is slidably connected in the first cylinder body There is first piston, the connecting rod is fixedly connected far from one end of slide plate with first piston, and the first cylinder body is divided by first piston Left chamber and right chamber, left chamber and right chamber are communicated with inlet tube and out liquid hose respectively, be mounted on inlet tube by Liquid imports the first check valve of the first cylinder body, is mounted on liquid hose out unidirectional by the second of liquid the first cylinder body of export Valve, the one end of liquid hose far from the first cylinder body is connected to sparge pipe out；Fluid reservoir is installed by the cutting bed, fluid reservoir, Cutting fluid is filled in left chamber and right chamber, the one end of the inlet tube far from the first cylinder body is connected to fluid reservoir；It is described The lower section of cutter plate is equipped with accumulator tank, and the length of accumulator tank and the stroke of cutter plate are identical, are fixedly connected in accumulator tank Strainer is placed with spongy layer on strainer, is communicated with return pipe between the bottom and fluid reservoir of accumulator tank.

The working principle of this base case is: after sheet metal is fixed on movable block by fixed mechanism, starting Stepper motor, stepper motor drives cutter plate rotation, by pushing slide plate to make the stepper motor being mounted on slide plate, hydrojet Pipe and connecting rod are mobile, and cutter plate occurs mobile and starts to cut sheet metal.At this point, due to connecting rod as slide plate is mobile, and Connecting rod is fixedly connected with first piston, and therefore, first piston is slided to left chamber direction, so that the volume of left chamber reduces, liquid Pressure increases, and the indoor cutting fluid of left chamber is extruded into out in liquid hose, sprays to cutting for cutter plate and sheet metal through sparge pipe Place is cut, cooling down is carried out to cut place, while lubricating cut place；Meanwhile the volume of right chamber increases, hydraulic reduction, liquid storage Cutting fluid in tank has been inhaled into right chamber through inlet tube.The cutting fluid of cut place is sprayed under the effect of gravity, along cutting The gap at place is dropped in accumulator tank, at this point, mixing the metal debris generated when cutting sheet metal, accumulator tank in cutting fluid Interior spongy layer and strainer retains metal debris, only cutting fluid is allowed to flow through, and therefore, cutting fluid after filtering is made in gravity It is flowed into fluid reservoir with lower through return pipe, realizes the recycling of cutting fluid.

The beneficial effect of this base case is:

1, in this base case, first piston is pulled to slide by connecting rod when mobile using stepper motor, so that left The volume of chamber and right chamber changes, and cutting fluid is rear again by cutting fluid force feed to hydrojet out of fluid reservoir suction cylinder body Pipe, and sparge pipe moves simultaneously with cutter plate, realizes and sprays cutting fluid to cut place in real time, carries out effective temperature-reducing to cut place It is cooling, reduce the thermal deformation of the sheet metal of cutter plate and cut place, keep the hardness of cutter plate, improve machining accuracy and The durability of cutter plate.

2, in this base case, cutting fluid can carry the gap that the metal debris generated in cutting process passes through cut place Be dropped in accumulator tank, by accumulator tank spongy layer and strainer metal debris retained so that flowing back to the cutting in fluid reservoir Liquid is free from foreign meter, and then realizes the real-time recycling and reusing of cutting fluid, avoids the waste of cutting fluid, reduces the cutting of sheet metal Cost.

3, in this base case, spongy layer can not only metal debris in effectively catching cutting fluid, moreover it is possible to effectively avoid Strainer is blocked by metal iron filings.Meanwhile staff can easily take out spongy layer out of accumulator tank, be convenient for changing.

4, in this base case, due to driving cutter plate rotation using stepper motor, cutter plate can be rotated forward With rotate backward, therefore, when slide plate slides one back and forth under external force, cutter plate rotated forward before this, after be reversed Rotation can carry out cutting twice to sheet metal, and have cutting fluid to be sprayed to cut place in cutting process always, and then improve To the cutting efficiency of sheet metal.

Further, the collecting vessel for collecting the sheet metal after cutting is installed by the cutting bed, is slided in collecting vessel It is dynamic to be connected with transverse slat, the top formation groove body of transverse slat and collecting vessel, the bottom formation seal chamber of transverse slat and collecting vessel, the bottom of transverse slat Spring is fixedly connected between face and the bottom wall of collecting vessel；The second cylinder body is fixedly installed on the cutting bed, in the second cylinder body Second piston is slidably connected, the second cylinder body is divided into first chamber and second chamber, first chamber and sealing by second piston Appendix is communicated between chamber, the side wall of second chamber offers venthole, and the second piston is fixedly connected with piston rod, living Stopper rod is fixedly connected far from one end of second piston with movable block.

After completing primary cutting, the sheet metal after cutting is fallen in the groove body of collecting vessel, and transverse slat is made at this time It is firmly slided to the bottom wall direction of collecting vessel, the volume of seal chamber reduces, internal pressure increases, and sealing intracavity gas enters through appendix In first chamber, second piston is pushed to slide to second chamber direction, second piston drives piston rod mobile, and piston rod, which pushes, to be moved Motion block is slided to accumulator tank direction so that the mobile a distance of the sheet metal that is fixed on movable block, so as to cutter plate into Row is cut next time, is realized automatically moving for sheet metal, is reduced the workload of staff, improves the automation journey of the present apparatus Degree.

Further, buffer is filled in the groove body.

The impact force when sheet metal that the intracorporal buffer of slot can slow down after cutting is fallen into groove body, avoids metal plate Material is impaired, and simultaneous buffering liquid can continue to cooling sheet metal, reduces the thermal deformation of sheet metal.

Further, the filter cage that can be taken off is installed in the groove body, filters and is fixedly connected with handle at the top of cage.

The setting of filter cage and handle enables to staff disposably to take out the intracorporal sheet metal of slot, convenient fast It is prompt.

Further, the collecting vessel is fixedly connected with inclined plate, the one end of inclined plate far from collecting vessel close to the side of accumulator tank Towards accumulator tank.

Inclined plate can guide the sheet metal after cutting to slide along inclined plate to groove body.

Further, the fixed mechanism includes fixed plate, the first threaded rod and two pieces of limit plates, and two pieces of limit plate slidings connect It connects on movable block, two pieces of limit plates are parallel to each other, and first passed through for the first threaded rod is offered on two pieces of limit plates and is led to Hole；Several second threaded rods are fixedly connected on the movable block, fixed plate offers second passed through for the second threaded rod and leads to Hole, fixed plate are located at the top of limit plate.

Sheet metal is placed between two pieces of limit plates, the first threaded rod passes through the first through hole on two pieces of limit plates, It is screwed on the first threaded rod using nut, so that two pieces of limit plates are close to the two sidewalls of sheet metal；Recycle nut the It is screwed on two threaded rods, so that fixed plate is close to the top of sheet metal, the fixation of sheet metal is realized with this, also, this is solid Sheet metal of different specifications and sizes can be fixed by determining mechanism, improve the scope of application of the present apparatus.

Detailed description of the invention

Fig. 1 is a kind of structural schematic diagram of the metal plate cutting device of Furniture manufacturing of the utility model embodiment kind；

Fig. 2 is the schematic top plan view of fixed mechanism in Fig. 1；

Fig. 3 is the enlarged diagram of the A in Fig. 1；

Fig. 4 is the partial left side view at Fig. 1 middle slide plate.

Specific embodiment

It is further described below by specific embodiment:

Appended drawing reference in Figure of description includes: cutting bed 1, movable block 2, fixed mechanism 3, fixed plate 4, the first screw thread Bar 5, limit plate 6, the second threaded rod 7, pillar 8, top plate 9, slide plate 10, stepper motor 11, telescopic cylinder 12, cutter plate 13, Sparge pipe 14, connecting rod 15, curved baffle 16, the first cylinder body 17, first piston 18, left chamber 19, right chamber 20, the first inlet tube 21, first goes out liquid hose 22, the second inlet tube 23, second liquid hose 24, fluid reservoir 25, accumulator tank 26, strainer 27, spongy layer out 28, return pipe 29, collecting vessel 30, transverse slat 31, groove body 32, filter cage 33, handle 34, seal chamber 35, spring 36, inclined plate 37, second Cylinder body 38, second piston 39, first chamber 40, second chamber 41, appendix 42, piston rod 43, sheet metal 44.

The present embodiment is basic as shown in Figure 1, a kind of metal plate cutting device of Furniture manufacturing, including cutting bed 1, cuts Level slidably connects movable block 2 in the ceding of Taiwan 1, and the fixed mechanism 3 for fixed metal plate material is equipped on movable block 2.In conjunction with Shown in Fig. 2, fixed mechanism 3 includes that fixed plate 4, the first threaded rod 5 and two pieces of limit plates 6, two pieces of limit plates 6 are slidably connected at shifting On motion block 2, two pieces of limit plates 6 are parallel to each other, and the first through hole passed through for the first threaded rod 5 is offered on two pieces of limit plates 6； Four second threaded rods 7 are fixedly connected on movable block 2, fixed plate 4 offers the second through-hole passed through for the second threaded rod 7, Fixed plate 4 is located at the top of limit plate 6.

The right end of cutting bed 1 is fixedly connected with pillar 8, and pillar 8 is fixedly connected with top plate 9, the basal sliding connection of top plate 9 There is slide plate 10, stepper motor 11 is fixedly installed on slide plate 10, as shown in connection with fig. 4, the bottom of top plate 9 is fixedly installed with flexible gas The output end of cylinder 12, telescopic cylinder 12 is fixedly connected with stepper motor 11, and the output end of stepper motor 11 has been fixedly and coaxially connected For cutting the cutter plate 13 of sheet metal.Sparge pipe 14 and connecting rod 15 are fixedly installed on slide plate 10, as shown in connection with fig. 3, The left end of sparge pipe 14 is U-shaped, and U-shaped both ends are mouth spray, two mouth sprays be located at cutter plate 13 left side and Right side, mouth spray is towards the bottom end of cutter plate 13.Sparge pipe 14 is fixedly connected with curved baffle 16, and curved baffle 16 is located at The center of circle of the top of cutter plate 13, curved baffle 16 is overlapped with the center of circle of cutter plate 13.

As shown in connection with fig. 4, the bottom of top plate 9 is fixedly installed with the first cylinder body 17, and is slidably connected in the first cylinder body 17 The right end of one piston 18, connecting rod 15 is fixedly connected with the left side of first piston 18.First cylinder body 17 is divided by first piston 18 Left chamber 19 and right chamber 20, left chamber 19 are communicated with the first inlet tube 21 and first and go out liquid hose 22, and right chamber 20 is communicated with Second inlet tube 23 and second goes out liquid hose 24, is mounted on the first inlet tube 21 and the second inlet tube 23 and imports cutting fluid First check valve of the first cylinder body 17, first, which goes out liquid hose 22 and second, goes out on liquid hose 24 to be mounted on by cutting fluid export the The second one-way valve of one cylinder body 17.First go out liquid hose 22 and second go out liquid hose 24 left end be connected to sparge pipe 14.

The right side of cutting bed 1 is equipped with fluid reservoir 25, fills cutting in fluid reservoir 25, left chamber 19 and right chamber 20 The lower end of liquid, the first inlet tube 21 and the second inlet tube 23 is connected to fluid reservoir 25.The lower section of cutter plate 13 is equipped with recycling The length of slot 26, accumulator tank 26 is identical as the stroke of cutter plate 13, is fixedly connected with strainer 27 in accumulator tank 26, on strainer 27 It is placed with spongy layer 28, is communicated with return pipe 29 between the bottom and fluid reservoir 25 of accumulator tank 26.

The right side of cutting bed 1 is equipped with the collecting vessel 30 for collecting the sheet metal after cutting, sliding in collecting vessel 30 It is connected with transverse slat 31, groove body 32 is formed at the top of transverse slat 31 and collecting vessel 30, and buffer, installation in groove body 32 are filled in groove body 32 There is the filter cage 33 that can be taken off, the top of filter cage 33 is fixedly connected with handle 34.The bottom of transverse slat 31 and collecting vessel 30, which is formed, to be sealed Chamber 35 is fixedly connected with spring 36 between the bottom surface of transverse slat 31 and the bottom wall of collecting vessel 30.The top of the left side wall of collecting vessel 30 It is fixedly connected with inclined plate 37, the left end of inclined plate 37 is higher than right end, and inclined plate 37 is located at the right side of accumulator tank 26.

The left end of cutting bed 1 is fixedly installed with the second cylinder body 38, and second piston 39 is slidably connected in the second cylinder body 38, the Second cylinder body 38 is divided into first chamber 40 and second chamber 41 by two pistons 39, is connected between first chamber 40 and seal chamber 35 There is appendix 42, the right side wall of second chamber 41 offers venthole.The right side of second piston 39 is fixedly connected with piston rod 43, The right end of piston rod 43 is fixedly connected with movable block 2.

When specific works, sheet metal 44 is placed on movable block 2 first, sheet metal 44 is located at two pieces of limits at this time Between plate 6, and the right end of sheet metal 44 stretches out the right end of cutting bed 1.Two nuts are respectively fitted over the first threaded rod 5 Both ends screw two nuts respectively, so that two pieces of limit plates 6 are tightly attached on the front-rear side walls of sheet metal 44, then by four spiral shells Mother is respectively fitted on the second threaded rod 7, screws four nuts respectively, so that fixed plate 4, which moves down, compresses sheet metal 44, from And realize the fixation to sheet metal 44.

Secondly, starting stepper motor 11, stepper motor 11 drive cutter plate 13 to rotate counterclockwise, restart telescopic cylinder 12, telescopic cylinder 12 drives stepper motor 11 to move backward, and cutter plate 13 and sparge pipe 14 move backward, and rotate counterclockwise Cutter plate 13 cuts the right end of sheet metal 44.With the movement of stepper motor 11, the slide plate 10 in Fig. 4 is slided to the left Dynamic, connecting rod 15 pulls first piston 18 to slide to the left, volume reduction, the hydraulic increase of left chamber 19, then, in left chamber 19 Cutting fluid goes out liquid hose 22 through first and enters in sparge pipe 14, and sprays to cut place through sparge pipe 14, cools down to cut place Cooling and lubrication, curved baffle 16 can be avoided cutting fluid splashes when cutter plate 13 rotates at this time.Meanwhile right chamber 20 volume increases, hydraulic reduction, and the cutting fluid in fluid reservoir 25 is inhaled into right chamber 20 through the second inlet tube 23 to be stored.

Cutting fluid on sheet metal 44 carries the metal debris generated in cutting process and drips from the gap of cut place In accumulator tank 26, the filtering through spongy layer 28 and strainer 27 is retained the metal debris in cutting fluid, so that through return pipe 29 It flows back in the cutting fluid of fluid reservoir 25 without containing impurity, realizes the recycling and reusing of cutting fluid.

Telescopic cylinder 12 pulls on the movement of stepper motor 11, when cutter plate 13 finishes the cutting of sheet metal 44, Sheet metal section after cutting slides along inclined plate 37 to groove body 32, and volume buffer can be effectively reduced and be fallen into groove body 32 at this time Impact force suffered by sheet metal section in groove body 32, and then protect sheet metal section.

The sheet metal section fallen into groove body 32 sinks to transverse slat 31, at this time 31 slide downward of transverse slat, so that seal chamber 35 volume reduces, internal pressure increases, and gas enters in first chamber 40 through appendix 42 in seal chamber 35, pushes second piston 39 It slides to the right, second piston 39 drives piston rod 43 to move right, and piston rod 43 pushes movable block 2 to slide to the right, so that fixed Sheet metal 44 on movable block 2 moves right a distance, so that the right end of sheet metal 44 is again positioned at cutter plate Automatically moving for sheet metal 44 is realized so that cutter plate 13 is cut next time in 13 right side.

After sheet metal 44 moves right, stepper motor 11 drives cutter plate 13 to rotate clockwise, simultaneous retractable cylinder 12 drive stepper motor 11 to move forward, and the stepper motor 11 in Fig. 4 moves right, and slide plate 10 slides to the right, and connecting rod 15 pushes First piston 18 slides to the right, at this time volume reduction, the hydraulic increase of right chamber 20, and the cutting fluid in right chamber 20 goes out through second Liquid hose 24 enters in sparge pipe 14, and sprays to cut place through sparge pipe 14, carries out cooling down and lubrication to cut place.Together When, the volume of left chamber 19 increases, hydraulic reduction, and the cutting fluid in fluid reservoir 25 is inhaled into left chamber 19 through the first inlet tube 21 Interior storage.Therefore, during cutting sheet metal 44, cutting fluid will be sprayed from sparge pipe 14 always, and it is right in real time to realize Cut place carries out cooling down and lubrication.

The continuous pushing stepping motor 11 of telescopic cylinder 12 is moved forward and backward, and the constantly cutting sheet metal 44 of cutter plate 13 is cut Sheet metal section after cutting, which is fallen into groove body 32, enters the gas in seal chamber 35 in first chamber 40, so that piston Bar 43 pushes movable block 2 to move right, so that cutter plate 13 cuts sheet metal 44.

After the completion of the cutting of sheet metal 44, telescopic cylinder 12 is closed, stepper motor 11 stops movement, while the first cylinder body 17 stop working, and turn off stepper motor 11, cutting tool stops operating.At this point, staff remains fixed on movable block 2 Remaining sheet metal section is removed, then is held handle 34 and taken out the filter cage 33 in groove body 32, and then by the metal material in groove body 32 Expect that section is all taken out.

After the taking-up of cage 33 will be filtered, upward sliding under the action of spring 36 of transverse slat 31, the volume increase of seal chamber 35, internal pressure Reduce, then the gas in first chamber 40 enters in seal chamber 35 through appendix 42, and the internal pressure of first chamber 40 reduces, and second Piston 39 slides to the left, and piston rod 43 pulls movable block 2 to slide reset to the left.

Above-described is only the embodiments of the present invention, and the common sense such as well known specific structure and characteristic are herein in scheme It does not describe excessively.It should be pointed out that for those skilled in the art, in the premise for not departing from the utility model structure Under, several modifications and improvements can also be made, these also should be considered as the protection scope of the utility model, these all will not influence The effect and patent practicability that the utility model is implemented.

Claims (6)

1. a kind of metal plate cutting device of Furniture manufacturing, including cutting bed, it is characterised in that: horizontal on the cutting bed Movable block is slidably connected, the fixed mechanism for fixed metal plate material is installed, cutting bed is far from movable block on movable block One end is fixedly connected with pillar, and the top of pillar is fixedly connected with top plate, and the basal sliding of top plate is connected with slide plate, consolidates on slide plate Dingan County is equipped with stepper motor, and the output end of stepper motor is fixedly and coaxially connected the cutter plate for cutting sheet metal, institute It states and is fixedly installed with sparge pipe and connecting rod on slide plate, the one end of sparge pipe far from slide plate is towards the bottom end of cutter plate, the top The bottom of plate is fixedly installed with the first cylinder body, slidably connects first piston in the first cylinder body, the connecting rod far from slide plate one End is fixedly connected with first piston, and the first cylinder body is divided into left chamber and right chamber by first piston, and left chamber and right chamber are equal It has been respectively communicated with inlet tube and out liquid hose, the first check valve that liquid is imported to the first cylinder body has been mounted on inlet tube, out Be mounted on liquid hose by liquid export the first cylinder body second one-way valve, out the one end of liquid hose far from the first cylinder body with Sparge pipe connection；Fluid reservoir is installed by the cutting bed, cutting fluid is filled in fluid reservoir, left chamber and right chamber, it is described The one end of inlet tube far from the first cylinder body is connected to fluid reservoir；The lower section of the cutter plate is equipped with accumulator tank, accumulator tank Length is identical as the stroke of cutter plate, and strainer is fixedly connected in accumulator tank, and spongy layer, the bottom of accumulator tank are placed on strainer Return pipe is communicated between portion and fluid reservoir.

2. a kind of metal plate cutting device of Furniture manufacturing according to claim 1, it is characterised in that: the cutting Collecting vessel for collecting the sheet metal after cutting is installed by platform, transverse slat, transverse slat and collection are slidably connected in collecting vessel Groove body is formed at the top of bucket, and the bottom formation seal chamber of transverse slat and collecting vessel is solid between the bottom surface of transverse slat and the bottom wall of collecting vessel Surely it is connected with spring；It is fixedly installed with the second cylinder body on the cutting bed, slidably connects second piston in the second cylinder body, second Second cylinder body is divided into first chamber and second chamber by piston, is communicated with appendix between first chamber and seal chamber, and second The side wall of chamber offers venthole, and the second piston is fixedly connected with piston rod, the one end of piston rod far from second piston It is fixedly connected with movable block.

3. a kind of metal plate cutting device of Furniture manufacturing according to claim 2, it is characterised in that: the groove body Inside fill buffer.

4. a kind of metal plate cutting device of Furniture manufacturing according to claim 3, it is characterised in that: the groove body The filter cage that can be taken off inside is installed, filters and is fixedly connected with handle at the top of cage.

5. a kind of metal plate cutting device of Furniture manufacturing according to claim 4, it is characterised in that: the collection Bucket is fixedly connected with inclined plate close to the side of accumulator tank, and the one end of inclined plate far from collecting vessel is towards accumulator tank.

6. a kind of metal plate cutting device of Furniture manufacturing according to claim 5, it is characterised in that: the fixation Mechanism includes fixed plate, the first threaded rod and two pieces of limit plates, and two pieces of limit plates are slidably connected on movable block, two pieces of limit plates It is parallel to each other, offers the first through hole passed through for the first threaded rod on two pieces of limit plates；It is fixedly connected on the movable block There are several second threaded rods, fixed plate offers the second through-hole passed through for the second threaded rod, and fixed plate is located at the upper of limit plate Side.