CN219757903U - Full-automatic concrete cube press - Google Patents

Abstract

The utility model discloses a full-automatic concrete cube press, which relates to the technical field of presses and comprises a press, wherein an electric push rod is fixedly connected to the surface of the press, a detection plate is fixedly connected to the output end of the electric push rod, the surface of the detection plate is in sliding connection with the surface of the press, a test piece frame is arranged on one side of the press, conveying rollers which are equidistantly arranged are rotatably connected to the inner wall of the test piece frame, a placing plate which is obliquely arranged is fixedly connected to the inner wall of the test piece frame, and a conveying mechanism is arranged on the inner wall of the test piece frame. Through conveying mechanism's setting, make the device adopt only an electric putter can accomplish the defeated material work to the concrete test piece, reduced the device to the consumption of energy, and the cost is lower, and then reduced the defeated material cost of concrete test piece, simple structure has made things convenient for later stage staff to overhaul the device simultaneously, has higher use value.

Description

Full-automatic concrete cube press

Technical Field

The utility model relates to the technical field of presses, in particular to a full-automatic concrete cube press.

Background

The concrete is subjected to pressure in the structure firstly, so that the compressive strength target is the most important strength target, the compressive strength of the concrete is related to a plurality of factors such as composition data, construction methods and the like, and is also influenced by factors such as test piece dimensions, loading methods, loading speeds and the like, so that a standard strength measuring method and corresponding strength evaluation standards are required, and the measuring method of the compressive strength of the cube reflects the primary factors influencing the compressive strength of the cube.

The patent number 20212095160. X discloses a full-automatic concrete cube press, wherein a pushing cylinder is arranged on the upper side of the pushing cylinder. According to the utility model, the concrete pressure test is completed through a full-automatic conveying process, and manual operation is replaced.

However, this scheme is in the in-process of implementing, utilizes a plurality of power components such as feeding cylinder, pushing cylinder, driving motor and positioning motor to accomplish the automatic feeding to the concrete test piece, and then very big increase the device to the consumption of the energy, a plurality of power components's setting simultaneously has increased the holistic manufacturing cost of device simultaneously, has increased the defeated material cost of concrete test piece.

Disclosure of Invention

The utility model aims to at least solve one of the technical problems in the prior art, and provides a full-automatic concrete cube press which can solve the problems of more energy consumption and higher cost of a device.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a full-automatic concrete cube press, includes the press, the fixed surface of press is connected with electric putter, electric putter's output fixedly connected with pick-up plate, the surface of pick-up plate and the surface sliding connection of press, one side of press is provided with the test piece frame, the inner wall rotation of test piece frame is connected with the conveying roller that is the equidistance and arranges, the inner wall fixedly connected with of test piece frame is the board of placing that the slope set up, the cross-section of placing the board is L shape, the blanking mouth has been seted up to the surface of placing the board, the fixed surface of press is connected with the blanking board that is the kink, one side and the surface contact of test piece frame of press are kept away from to the blanking board, the inner wall of test piece frame is provided with conveying mechanism.

Preferably, the conveying mechanism comprises two rotating shafts, the surfaces of the rotating shafts are all in rotational connection with the inside of the test piece frame, the rotating shafts are all protruded out of the surface of the test piece frame, the surfaces of the rotating shafts are all fixedly connected with second bevel gears which are arranged at equal intervals, the second bevel gears are all located in the inside of the test piece frame, the two ends of the conveying roller are all fixedly connected with first bevel gears, the surfaces of the second bevel gears are respectively in meshed connection with the surfaces of the two first bevel gears, the two rotating shaft protrusions are all in rotational connection with the first gears at one end of the surface of the test piece frame, a U-shaped connecting rod is fixedly connected with the surface of the connecting rod, the connecting rod is in sliding connection with the inside of the press, the connecting rod is far away from the first toothed plate of one end fixedly connected with of the test piece, and the surface of the first toothed plate is in meshed connection with the surface of the first gear.

Preferably, the inside sliding connection who places the board has the baffle, the bottom fixedly connected with two second pinion racks of baffle, two the cross-section of second pinion rack all is the shape of falling L, two the surface of second pinion rack all with test piece frame's inside sliding connection, two the surface of pivot all rotates and is connected with the second gear, two the surface of second gear is connected with the surface engagement of two second pinion racks respectively.

Preferably, the surface fixedly connected with two sliding sleeves of test piece frame, two equal sliding connection of inner wall of sliding sleeve has the squeeze lever, two the one end that two sliding sleeves were kept away from to the squeeze lever is fixed connection respectively at the surface of two second pinion racks, two equal fixedly connected with first spring of one end that two second pinion racks were kept away from to the squeeze lever, two the one end that two first pinion racks were kept away from to first spring is fixed connection respectively at the inner wall of two sliding sleeves.

Preferably, the inner wall sliding connection of first gear has the slide bar of circumference equidistance arrangement, the one end that the slide bar kept away from first gear is the hemisphere, the spout that is circumference equidistance arrangement has been seted up on the surface of pivot, the cross-section of spout is the hook-shaped that the slope set up, the surface of slide bar and the inner wall interactive sliding connection of spout, two the inner wall of second gear all is provided with slide bar, spout and second spring equally.

Preferably, the surface sliding connection who places the board has two splint, the surface rotation that places the board is connected with two-way threaded rod, two-way threaded rod's surface and the inside threaded connection of two splint, two the inside screw thread of splint respectively with the screw thread phase-match at two ends of two-way threaded rod, the inner wall of test piece frame sets up splint and two-way threaded rod equally.

Preferably, the surface of the placing plate is inlaid with balls.

Compared with the prior art, the utility model has the beneficial effects that:

(1) This full-automatic concrete cube press, through conveying mechanism's setting, make the device adopt only an electric putter can accomplish the defeated material work to the concrete test piece, reduced the consumption of device to the energy, and the cost is lower, and then reduced the defeated material cost of concrete test piece, simple structure has simultaneously made things convenient for later stage staff to overhaul the device, has higher use value.

(2) This full-automatic concrete cube press, through the setting of second spring, spout and slide bar, make the device detect the time measuring to the concrete sample, the device can not drive the conveying roller when sending into the press with the concrete sample promptly and carry the concrete sample to avoided the concrete sample to the greatest extent to carry out the material to the press constantly, thereby lead to the concrete sample to pile up on the press, influence the follow-up condition that detects the concrete sample, and then guaranteed the device and detected the smooth detection of concrete sample, guaranteed the orderly going on that the concrete sample detected.

(3) This full-automatic concrete cube press for limit the both sides of concrete sample through the setting of two splint, thereby avoided the concrete sample to take place askew on placing the board as far as possible, thereby lead to the concrete sample unable to drop from placing the board smoothly, lead to the condition of unable smooth operation, and then guaranteed the smooth operation of device.

Drawings

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a schematic view of a fully automatic concrete cube press according to the present utility model;

FIG. 2 is an enlarged schematic view of the utility model at A in FIG. 1;

FIG. 3 is an enlarged schematic view of the utility model at B in FIG. 1;

FIG. 4 is a schematic view of the internal structure of the press according to the present utility model;

FIG. 5 is a schematic view of the internal structure of the specimen holder of the present utility model;

FIG. 6 is a top view of a placement plate of the present utility model;

FIG. 7 is a side view of the spindle of the present utility model;

fig. 8 is a front view of a sliding sleeve according to the present utility model.

Reference numerals: 1. a test piece rack; 2. a ball; 3. placing a plate; 4. a two-way threaded rod; 5. a conveying roller; 6. an electric push rod; 7. a detection plate; 8. a blanking plate; 9. a press; 10. a baffle; 11. a clamping plate; 12. a sliding sleeve; 13. a first toothed plate; 14. a first gear; 15. a rotating shaft; 16. a connecting rod; 17. a first spring; 18. a first bevel gear; 19. a second bevel gear; 20. a second gear; 21. a second spring; 22. a chute; 23. a slide bar; 24. a second toothed plate; 25. a blanking port; 26. and extruding the rod.

Detailed Description

Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, greater than, less than, exceeding, etc. are understood to exclude this number, and above, below, within, etc. are understood to include this number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1-8, the present utility model provides a technical solution: the utility model provides a full-automatic concrete cube press, including press 9, be used for carrying out extrusion test to the concrete cube, press 9's fixed surface is connected with electric putter 6, electric putter 6's output fixedly connected with pick-up plate 7, pick-up plate 7's surface and press 9's surface sliding connection, be used for placing the concrete test piece that treats the test, one side of press 9 is provided with test piece frame 1, be used for placing and wait to detect the concrete test piece, test piece frame 1's inner wall rotation is connected with and is equidistant conveying roller 5 of arranging, be used for carrying the concrete test piece, test piece frame 1's inner wall fixedly connected with is the placing plate 3 that the slope set up, thereby make the concrete test piece can slide on the surface of placing plate 3 voluntarily, thereby reach autoloading's purpose, place plate 3's cross-section is L shape, thereby L shape place plate 3, thereby can block the concrete test piece, thereby the circumstances that concrete test piece was placed from placing plate 3 on the circumstances of roll-off, and then guaranteed the smooth operation of device, be provided with opening 25 for placing the blanking to carry out blanking to the concrete test piece, place the inner wall rotation of test piece 1 is connected with and is the placing plate 3, thereby the surface is placed through ball 3 has been placed on the surface through the ball has been reduced, thereby placed 2, the smooth performance has been placed on the surface of the surface has been set up through ball 3.

The fixed surface of press 9 is connected with blanking board 8 that is the form of buckling, and the one side that blanking board 8 kept away from press 9 and the surface contact of test piece frame 1 for guide the concrete sample on the test piece frame 1, guaranteed that the concrete sample can fall on the pick-up plate 7 smoothly, thereby guaranteed follow-up smooth detection to the concrete sample, guaranteed the smooth operation of device.

The inner wall of test piece frame 1 is provided with conveying mechanism, conveying mechanism includes two pivots 15, the surface of two pivots 15 all rotates with the inside of test piece frame 1 to be connected, two pivots 15 all protrude in the surface of test piece frame 1, the equal fixedly connected with in surface of two pivots 15 is equidistant second bevel gear 19 of arranging, two second bevel gears 19 all are located the inside of test piece frame 1, the both ends of conveying roller 5 are first bevel gear 18 of fixedly connected with, the surface of two second bevel gears 19 respectively with the surface engagement of two first bevel gears 18 is connected, the equal rotation of one end on two pivots 15 protrusion and test piece frame 1 surface is connected with first gear 14, the fixed surface of pick-up plate 7 is connected with connecting rod 16 that is the U-shaped, the surface of connecting rod 16 and the inside sliding connection of press 9, thereby through the setting of connecting rod 16U-shaped, and then avoided blanking plate 8's setting as far as possible, the operation to connecting rod 16 causes the blocking, thereby influence the condition of device smooth operation.

The connecting rod 16 is kept away from the first pinion rack 13 of one end fixedly connected with of pick-up plate 7, the surface of first pinion rack 13 is connected with the surface engagement of first gear 14, the inner wall sliding connection of first gear 14 has the slide bar 23 of circumference equidistance range, the one end that slide bar 23 kept away from first gear 14 is the hemisphere, spout 22 that is circumference equidistance range is seted up on the surface of pivot 15, the cross-section of spout 22 is the hook-shaped that the slope set up, the surface of slide bar 23 and the inner wall interactive sliding connection of spout 22, hemispherical slide bar 23 has reduced the frictional force between slide bar 23 and the spout 22, thereby the smoothness of device operation has been improved, the one end fixedly connected with second spring 21 of slide bar 23 kept away from spout 22, the one end fixed connection of slide bar 23 is kept away from to second spring 21 is in the inside of first gear 14.

The inside sliding connection who places board 3 has baffle 10 for block the slip of concrete sample, thereby avoided the concrete sample to the greatest extent when placing board 3 and slided, the concrete sample once only drops more, and then lead to the concrete sample to pile up more on conveying roller 5, thereby influence the follow-up condition that detects the concrete sample, and then guaranteed the smooth operation of device.

The bottom fixedly connected with two second pinion racks 24 of baffle 10, the cross-section of two second pinion racks 24 all is the shape of falling L, the surface of two second pinion racks 24 all with the inside sliding connection of test piece frame 1, the surface of two pivot 15 all rotates and is connected with second gear 20, the surface of two second gears 20 respectively with the surface engagement connection of two second pinion racks 24, the inner wall of two second gear 20 all is provided with slide bar 23 equally, spout 22 and second spring 21, the surface fixedly connected with two sliding sleeves 12 of test piece frame 1, the inner wall of two sliding sleeves 12 all sliding connection has extrusion rod 26, the one end that two extrusion rod 26 kept away from two sliding sleeves 12 is fixedly connected with the surface of two second pinion racks 24 respectively, the one end that two extrusion rod 26 kept away from two second pinion racks 24 is fixedly connected with first spring 17 respectively, the one end that two first spring 17 kept away from two first pinion racks 13 is fixedly connected with the inner wall of two sliding sleeves 12 respectively.

The surface sliding connection who places board 3 has two splint 11, place the surface rotation of board 3 and be connected with two-way threaded rod 4, the surface of two-way threaded rod 4 and the inside threaded connection of two splint 11, the inside screw thread of two splint 11 respectively with the screw thread phase-match at two ends of two-way threaded rod 4, thereby guaranteed that the staff when rotating two-way threaded rod 4, can drive two splint 11 smoothly and carry out relative or opposite movement, and then guaranteed the smooth operation of device, simultaneously through the setting of two splint 11, be used for restricting the both sides of concrete test piece, thereby the concrete test piece has been avoided taking place to warp on placing board 3 as far as possible, thereby the unable smooth follow of concrete test piece that drops of placing board 3 that leads to the condition of unable smooth operation, and then guaranteed the smooth operation of device, simultaneously through the setting of two-way threaded rod 4, can be adjusted the distance between two splint 11, thereby make the device can restrict the concrete test piece of different sizes, and then improved the application range of device, the limitation of device has been improved, the effect of device has been had higher practical value, the inner wall setting of test piece frame 1 and the same threaded rod 11 can restrict the concrete test piece 5 on the two-way roll.

Further, when the press 9 detects the concrete specimen, the operator can start the electric push rod 6 to push the detection plate 7 to slide on the surface of the press 9, and then push the concrete specimen on the detection plate 7 into the press 9, so that the press 9 can be started to detect the concrete specimen at this time, meanwhile, the detection plate 7 slides on the press 9 and drives the connecting rod 16 to slide in the interior of the press 9, and then drives the first toothed plate 13 to move, as the first toothed plate 13 is meshed with the first gear 14, thereby driving the first gear 14 to rotate, and then drives the slide bar 23 on the first gear 14 to slide along the inclined plane of the slide groove 22, and meanwhile, as the slide groove 22 is in an inclined arrangement, and then the inclined plane of the slide groove 22 gradually extrudes the surface of the slide bar 23 when the slide bar 23 slides in the slide groove 22, so that the slide bar 23 gradually contracts into the interior of the first gear 14, and compresses the second spring 21, and then the rotation of the first gear 14 does not drive the rotating shaft 15 to rotate, and then does not drive the conveying roller 5 on the specimen 1 to rotate, and then the concrete specimen 9 is not driven to continuously move, and the concrete specimen 9 is continuously detected on the concrete specimen 9, and the concrete specimen is continuously conveyed by the concrete specimen is continuously, and the concrete specimen is continuously detected on the concrete specimen 9, and the concrete specimen is continuously detected by the device when the pressure device is continuously detecting the concrete specimen 9, the orderly detection of the concrete test piece is ensured.

After the concrete test piece is detected, the external mechanism is utilized to take away the concrete test piece on the detection plate 7, then the electric push rod 6 is started to pull out the detection plate 7 from the inside of the press machine 9, thereby driving the first toothed plate 13 to rotate through the connecting rod 16, driving the first gear 14 to rotate through meshed connection, and driving the position of the sliding rod 23 to change, so that the sliding rod 23 extrudes the hook surface of the inner wall of the sliding groove 22, thereby pushing the rotating shaft 15 to rotate, driving the second bevel gear 19 and the second gear 20 to rotate, driving the first bevel gear 18 to rotate through meshed connection, driving the second toothed plate 24 to slide and descend in the test piece frame 1, driving the conveying roller 5 to rotate, and then conveying the concrete test piece on the conveying roller 5, and pushing the concrete test piece into the blanking plate 8, thereby automatically sliding down on the detection plate 7 along the inclined plane of the blanking plate 8, realizing automatic feeding of the concrete test piece on the press machine 9, simultaneously, the second toothed plate 24 pulls the baffle plate 10 to slide down in the placement plate 3, simultaneously, the second toothed plate 24 presses the extrusion rod 26 to slide in the sliding sleeve 12, and further compresses the first spring 17, thereby gradually lowering the baffle plate 10, and gradually not blocking the sliding of the concrete on the placement plate 3, so that the concrete test piece is not blocked any more, further, the concrete test piece slides from the blanking port 25, falls on the conveying roller 5, further realizing automatic feeding of the concrete test piece on the conveying roller 5, simultaneously, when the electric push rod 6 brings the concrete test piece on the detection plate 7 into the press machine 9 again, the second toothed plate 24 loses the downward pulling force because the rotating shaft 15 does not rotate at the moment, thereby under the elasticity of first spring 17, promote the carriage 26 and slide in sliding sleeve 12 and rise, and then drive second pinion rack 24 and slide in test piece frame 1, and drive second gear 20 through the meshing connection and rotate, simultaneously under the effect of second spring 21, spout 22 and slide bar 23, the rotation of second gear 20 can not drive pivot 15 and rotate, and the removal of second pinion rack 24, and then drive baffle 10 and restore the original state, will wait for the concrete sample jack-up of whereabouts this moment, and then when accelerating the sliding velocity of waiting for the concrete sample of whereabouts, can cause the slip of next concrete sample again to block, make the concrete sample can not descend in succession, and then avoided the concrete sample once only to drop more, cause the condition that piles up on conveying roller 5 to the concrete sample, and then guaranteed that the device carries out the concrete sample in order, and then through conveying mechanism's setting, make the device adopt only an electric putter 6 can accomplish the material conveying work to the concrete sample, the device is to the energy consumption is reduced, and lower, and the cost is simple to the concrete sample of service life has been reduced, and the device has convenient service cost is realized to the concrete sample at the same time.

Working principle: after the concrete test piece is detected, the external mechanism is utilized to take away the concrete test piece on the detection plate 7, then the electric push rod 6 is started to pull out the detection plate 7 from the inside of the press machine 9, thereby the first toothed plate 13 is driven to rotate through the connecting rod 16, and then the first gear 14 is driven to rotate through engagement connection, and then the position of the sliding rod 23 is driven to change, so that the sliding rod 23 extrudes the hook surface of the inner wall of the sliding groove 22, and then the rotating shaft 15 is driven to rotate, and then the second bevel gear 19 and the second gear 20 are driven to rotate, and then the first bevel gear 18 is driven to rotate through engagement connection, and meanwhile the second toothed plate 24 is driven to slide and descend in the test piece frame 1, and then the conveying roller 5 is driven to rotate, and then the concrete test piece on the conveying roller 5 is conveyed, and then the concrete test piece is pushed onto the blanking plate 8, and thus the inclined surface of the blanking plate 8 is driven to automatically slide on the plate 7, and automatic feeding of the concrete test piece on the press machine 9 is realized.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims (7)

1. Full-automatic concrete cube press, including press (9), its characterized in that: the utility model provides a surface mounting who presses machine (9) has electric putter (6), the output fixedly connected with pick-up plate (7) of electric putter (6), the surface of pick-up plate (7) and the surface sliding connection of press machine (9), one side of press machine (9) is provided with test piece frame (1), the inner wall rotation of test piece frame (1) is connected with and is equidistant conveying roller (5) that arranges, the inner wall fixedly connected with of test piece frame (1) is inclined setting place board (3), the cross-section of placing board (3) is L shape, blanking mouth (25) have been seted up to the surface of placing board (3), the surface mounting of press machine (9) has blanking board (8) that are the kink, one side that press machine (9) were kept away from to blanking board (8) is with the surface contact of test piece frame (1), the inner wall of test piece frame (1) is provided with conveying mechanism.

2. A fully automated concrete cube press according to claim 1, characterized in that: the conveying mechanism comprises two rotating shafts (15), the surfaces of the rotating shafts (15) are all in rotational connection with the inside of the test piece frame (1), the rotating shafts (15) are all protruded out of the surface of the test piece frame (1), the surfaces of the rotating shafts (15) are all fixedly connected with second bevel gears (19) which are equidistantly arranged, the two bevel gears (19) are all located in the inside of the test piece frame (1), the two ends of the conveying roller (5) are all fixedly connected with first bevel gears (18), the surfaces of the two second bevel gears (19) are respectively in meshed connection with the surfaces of the two first bevel gears (18), the two rotating shafts (15) are protruded out of the surface of the test piece frame (1), one end of each of the surfaces of the test piece frame (1) is in rotational connection with a first gear (14), the surface of the test plate (7) is fixedly connected with a connecting rod (16) which is in a U shape, the surface of the connecting rod (16) is in sliding connection with the inside of the press (9), one end of the connecting rod (16) is far away from the test plate (7) is fixedly connected with the first gear (13), and the first gear (13) is in meshed with the surface of the first gear (13).

3. A fully automated concrete cube press according to claim 2, characterized in that: the inside sliding connection who places board (3) has baffle (10), the bottom fixedly connected with of baffle (10) two second pinion rack (24), two the cross-section of second pinion rack (24) all is the shape of falling L, two the surface of second pinion rack (24) all with the inside sliding connection of test piece frame (1), two the surface of pivot (15) all rotates and is connected with second gear (20), two the surface of second gear (20) is connected with the surface engagement of two second pinion racks (24) respectively.

4. A fully automated concrete cube press according to claim 3, characterized in that: the surface fixedly connected with two sliding sleeves (12) of test piece frame (1), two equal sliding connection of inner wall of sliding sleeve (12) has extrusion pole (26), two the one end that two sliding sleeves (12) were kept away from to extrusion pole (26) is fixed connection respectively at the surface of two second pinion racks (24), two equal fixedly connected with first spring (17) of one end that two second pinion racks (24) were kept away from to extrusion pole (26), two the one end that two first pinion racks (13) were kept away from to first spring (17) is fixed connection respectively at the inner wall of two sliding sleeves (12).

5. A fully automated concrete cube press according to claim 3, characterized in that: the inner wall sliding connection of first gear (14) has slide bar (23) of circumference equidistance arrangement, the one end that first gear (14) was kept away from to slide bar (23) is the hemisphere, spout (22) that are circumference equidistance arrangement are seted up on the surface of pivot (15), the cross-section of spout (22) is the hook-shaped that the slope set up, the surface of slide bar (23) and the inner wall interactive sliding connection of spout (22), two the inner wall of second gear (20) all is provided with slide bar (23), spout (22) and second spring (21) equally.

6. A fully automated concrete cube press according to claim 1, characterized in that: the surface sliding connection who places board (3) has two splint (11), the surface rotation that places board (3) is connected with two-way threaded rod (4), the surface of two-way threaded rod (4) and the inside threaded connection of two splint (11), two the inside screw thread of splint (11) respectively with the screw thread phase-match at two ends of two-way threaded rod (4), the inner wall of test piece frame (1) sets up splint (11) and two-way threaded rod (4) equally.

7. A fully automated concrete cube press according to claim 1, characterized in that: the surface of the placing plate (3) is inlaid with balls (2).