CN111805642A

CN111805642A - Shaving board production and processing technology

Info

Publication number: CN111805642A
Application number: CN202010792091.2A
Authority: CN
Inventors: 李梦振
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-08
Filing date: 2020-08-08
Publication date: 2020-10-23

Abstract

The invention relates to the technical field of shaving board production, in particular to a shaving board production and processing process, which uses a gluing processing device, the method for producing and processing the shaving board by using the gluing processing device comprises a plurality of steps of plate placing, gluing operation, glue solution solidification, plate pasting operation and the like, the gluing processing device adjusts the position of an adjusting rod in a sleeve on a U-shaped frame according to the abrasion degree of a brush hair part of a brush until the brush hair part of the brush hair part can be contacted with the shaving board placed on a bedplate again, the using time of the brush is prolonged, two T-shaped inserting plates on a glue storage box are inserted into T-shaped inserting grooves on the bedplate to finish the assembly of the glue storage box and the bedplate, the glue storage box is positioned under a baffle plate, when the glue solution on the shaving board is coated, the glue solution gathered at the end part of the brush hair part drips in the glue storage box under the blocking of the baffle plate, the dripping glue solution is collected in a centralized manner, and the pollution to the working environment caused by the random dripping of the glue solution is prevented.

Description

Shaving board production and processing technology

Technical Field

The invention relates to a shaving board production and processing technology, and belongs to the technical field of shaving board production.

Background

Particle board, bagasse board, artificial board made of wood or other wood cellulose material, and glued under heat and pressure after adhesive is applied, also called particle board. The shaving board is after the pressfitting finishes, for improving the smoothness on its surface, paste a deck sheet metal on the shaving board usually, mainly include that panel places in the process of pasting the sheet metal, the rubber coating operation, the glue solution solidifies and a plurality of steps such as flitch operation, need scribble a deck glue solution on the shaving board in the process of pasting the sheet metal, utilize the brush of bar form to scribble the glue solution that drips on the shaving board even during common means, but the brush is scribbling the glue solution in-process, some glue solution assembles the tip at the brush easily and drips from the brush tip at will under the blockking of brush, not only cause the glue solution extravagant, and influence operational environment neatness nature.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a production and processing process of a shaving board, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention is realized by the following technical scheme: a production and processing technology of a shaving board uses a gluing processing device, and the method for producing and processing the shaving board by using the gluing processing device comprises the following steps;

step one, placing the plate to be glued on the bedplate, adjusting the position of the plate to be glued and fixing the plate

Step two, gluing operation, namely uniformly coating glue solution on the fixed plate through gluing processing equipment, and introducing redundant glue solution into a glue storage box for storage in the gluing operation;

solidifying glue liquid, namely taking down the plate subjected to the glue coating treatment in the step two from the bedplate and horizontally placing the plate;

step four, pasting the board, pasting the prepared thin board and the board after glue treatment, driving and pressing the pasting position of the board and the thin board to enable the thin board and the board to be completely pasted, and collecting the processed board uniformly after the glue solution is solidified to obtain a formed shaving board;

the gluing processing equipment comprises a bedplate, a U-shaped frame is mounted on the upper surface of the bedplate, two round holes are symmetrically formed in the upper surface of the U-shaped frame, sleeves fixedly connected with the U-shaped frame are arranged on the upper sides of the round holes, vertically arranged adjusting rods are arranged in the round holes, the adjusting rods penetrate through the sleeves and are fixedly connected with the sleeves through bolts, a strip-shaped brush used for uniformly coating glue is fixedly connected to the lower end of each adjusting rod, vertically arranged notches are formed in the lower positions of two parallel side surfaces of the U-shaped frame, the end part of the brush penetrates through the notches to extend to the outer side of the U-shaped frame, vertically arranged baffles used for blocking the glue are arranged on one side of the notches, the baffles are fixedly connected with the U-shaped frame, a glue storage box used for temporarily storing the glue and with one part of the glue at the lower side of the bedplate is arranged, and a T-shaped slot matched with the T-shaped inserting plate is fixed on the lower surface of the bedplate, and the T-shaped inserting plate is inserted into the T-shaped slot.

The glue storage box comprises a box body, a glue storage box, a stop valve, an internal thread cover, a transparent barrel body and a glue storage box, wherein the glue storage box is arranged on the lower surface of the box body, the through hole is formed in one side of the lower surface of the glue storage box, a pipe joint fixedly connected with the glue storage box is arranged under the through hole, the lower end of the pipe joint is fixedly connected with the stop valve, the lower end of the stop valve is connected with the internal thread cover communicated with the stop valve, the internal thread cover is in threaded connection with the transparent barrel.

U type frame one side is equipped with the cloth rubber tube that the level was arranged and was connected with the system that supplies glue, cloth rubber tube surface lower part position equidistance installs a plurality of vertical layout's branch pipe, cloth rubber tube surface mounting has the connecting rod, the one end and the U type frame fixed connection of cloth rubber tube are kept away from to the connecting rod.

Specifically, a glue guiding groove with the bottom inclined outwards is formed in the position where the bedplate coincides with the notch.

Specifically, one side of the lower surface of the T-shaped inserting plate, which is far away from the glue storage box, is provided with a vertically arranged threaded hole, and a limiting bolt is engaged in the threaded hole.

Specifically, one side that T type picture peg lower surface is close to the glue storage box is fixed with the strengthening rib of slope form, the one end and the glue storage box fixed connection of T type picture peg are kept away from to the strengthening rib.

Specifically, the two parallel side surfaces of the T-shaped slot are respectively fixed with a connecting edge, and the connecting edges are fixedly connected with the bedplate through screws.

Specifically, a limiting ring is fixed in the through hole, and a detachable filter screen for filtering solid impurities is arranged on the upper side of the limiting ring.

Specifically, the through-hole downside is equipped with the internal thread circle, the internal thread circle with store up gluey box fixed connection, the one end surface processing that the stop valve was kept away from to the coupling has the second external screw thread with internal thread circle matched with, the coupling passes through second external screw thread and internal thread circle threaded connection.

Specifically, supporting legs are fixed at four edges of the lower surface of the bedplate, horizontal protruding blocks are fixed at the lower ends of the supporting legs, and mounting holes for inserting bolts are formed in the upper surfaces of the protruding blocks.

The invention has the beneficial effects that:

1. according to the invention, the position of the adjusting rod in the sleeve on the U-shaped frame is adjusted according to the degree of abrasion of the bristle part of the brush until the bristle part of the brush can be contacted with a shaving board placed on the bedplate again, and then the relative position of the adjusting rod and the sleeve is fixed by using the bolt, so that the convenient adjustment of the position of the brush is realized, and the service time of the brush is prolonged.

2. According to the invention, the two T-shaped inserting plates on the glue storage box are inserted into the T-shaped inserting grooves on the bedplate, so that the glue storage box and the bedplate are assembled, the glue storage box is positioned under the baffle, when the glue solution on the shaving board is coated by the brush, the glue solution gathered at the end part of the brush is dripped into the glue storage box under the blocking of the baffle, the dripped glue solution is collected in a centralized manner, and the pollution to the working environment caused by the random dripping of the glue solution is prevented.

3. According to the invention, the lower surface of the glue storage box is designed into the inclined surface inclined towards the direction of the through hole, so that glue dripping in the glue storage box is converged at the through hole, the glue in the glue storage box flows into the transparent cylinder after the stop valve is opened, and the transparent cylinder is unscrewed from the internal thread cover after the stop valve is closed, so that the aim of gradually transferring the glue in the glue storage box is fulfilled.

4. According to the invention, the filter screen for filtering solid impurities is arranged in the through hole, and when the stop valve is opened, the solid impurities contained in the glue solution flowing through the filter screen are blocked by the filter screen, so that the function of filtering the solid impurities is achieved, the filtered glue solution is conveniently added into the glue supply system again, and the recycling of the glue solution is convenient.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a flow diagram of a particle board manufacturing process according to the present invention;

FIG. 2 is a schematic view of the structure of the glue spreading apparatus of the present invention;

FIG. 3 is an enlarged view taken at A in FIG. 2;

FIG. 4 is an enlarged view of FIG. 2 at B;

FIG. 5 is a schematic view of the assembly of the T-shaped inserting plate and the glue storage box in the gluing processing device of the invention;

FIG. 6 is an enlarged view of FIG. 5 at C;

FIG. 7 is a schematic view of the assembly of the T-slot and the platen of the glue spreading apparatus of the present invention;

FIG. 8 is a perspective view of a U-shaped frame in the glue spreading apparatus of the present invention;

FIG. 9 is a left side view of a T-shaped insert plate in the glue spreading apparatus of the present invention;

FIG. 10 is a schematic view of the assembly of the pipe joint, the filter screen and the glue storage box in the gluing processing apparatus of the present invention;

in the figure: 1. the plastic film packaging machine comprises a bedplate, 2, a plastic film distributing pipe, 3, a branch pipe, 4, a U-shaped frame, 5, an adjusting rod, 6, a sleeve, 7, a connecting rod, 8, a brush, 9, a notch, 10, a baffle, 11, a plastic storage box, 12, a transparent cylinder body, 13, a supporting leg, 14, a plastic guiding groove, 15, a pipe joint, 16, a stop valve, 17, an internal thread cover, 18, a round hole, 19, a T-shaped inserting plate, 20, a reinforcing rib, 21, a threaded hole, 22, a limiting bolt, 23, a T-shaped inserting groove, 24, a connecting edge, 25, a limiting ring, 26, a through hole, 27, a filter screen, 28 and an internal.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

Referring to fig. 1 to 10, the present invention provides a technical solution: a production and processing technology of a shaving board uses a gluing processing device, and the method for producing and processing the shaving board by using the gluing processing device comprises the following steps;

step one, placing the plate to be glued on the bedplate 1, adjusting the position of the plate to be glued and fixing the plate

Step two, gluing operation, namely uniformly coating glue solution on the fixed plate through gluing processing equipment, and introducing redundant glue solution into the glue storage box 11 for storage in the gluing operation;

solidifying glue liquid, namely taking down the plate subjected to the glue coating treatment in the step two from the bedplate 1 and horizontally placing the plate;

the gluing processing equipment comprises a bedplate 1, a U-shaped frame 4 is arranged on the upper surface of the bedplate 1, two round holes 18 are symmetrically formed in the upper surface of the U-shaped frame 4, sleeves 6 fixedly connected with the U-shaped frame 4 are arranged on the upper sides of the round holes 18, vertically arranged adjusting rods 5 are arranged in the round holes 18, the adjusting rods 5 penetrate through the sleeves 6 and are fixedly connected with the sleeves 6 through bolts, strip-shaped brushes 8 used for uniformly coating glue are fixedly connected to the lower ends of the adjusting rods 5, vertically arranged notches 9 are formed in the lower positions of two parallel side surfaces of the U-shaped frame 4, the end parts of the brushes 8 penetrate through the notches 9 and extend to the outer side of the U-shaped frame 4, vertically arranged baffle plates 10 used for blocking the glue are arranged on one side of the notches 9, the baffle plates 10 are fixedly connected with the U-shaped frame 4, glue storage boxes 11 used for temporarily storing the glue and partially positioned on the lower sides of, the lower surface of the bedplate 1 is fixed with a T-shaped slot 23 matched with the T-shaped inserting plate 19, the T-shaped inserting plate 19 is inserted into the T-shaped slot 23, two T-shaped inserting plates 19 on the glue storage box 11 are inserted into the T-shaped slot 23 on the bedplate 1, the assembly of the glue storage box 11 and the bedplate 1 is completed, the glue storage box 11 is located under a baffle 10, when glue solution on a shaving board is coated by using the hairbrush 8, the glue solution gathered at the end part of the hairbrush 8 is dripped into the glue storage box 11 under the blocking of the baffle 10, the concentrated collection of the dripped glue solution is realized, and the pollution to the working environment caused by the dripping of random glue solution is prevented.

The glue guiding groove 14 with the bottom inclined outwards is formed in the position where the bedplate 1 coincides with the notch 9, the glue guiding groove 14 is machined on the bedplate 1, glue liquid dripped into the notch 9 by the brush 8 is conveniently guided into the glue storage box 11, and the glue liquid collecting effect is improved.

One side of the lower surface of the T-shaped inserting plate 19, which is far away from the glue storage box 11, is provided with a threaded hole 21 which is vertically arranged, a limiting bolt 22 is engaged in the threaded hole 21, after the T-shaped inserting plate 19 is installed in the T-shaped slot 23, part of the glue storage box 11 is positioned at the lower side of the bedplate 1 at the moment, the limiting bolt 22 in the threaded hole 21 is screwed, one end of the limiting bolt 22 is tightly attached to the inner surface of the T-shaped slot 23, and therefore the T-shaped inserting strip is prevented from sliding in the T-shaped slot 23 along with the limiting effect of the limiting.

One side that T type picture peg 19 lower surface is close to storing up gluey box 11 is fixed with the strengthening rib 20 of slope form, and the strengthening rib 20 is kept away from the one end of T type picture peg 19 and is stored up gluey box 11 fixed connection, installs the strengthening rib 20 of slope form additional between T type picture peg 19 and storage gluey box 11, improves T type picture peg 19 and stores up gluey box 11 stability of being connected.

The connecting edges 24 are fixed on two parallel side surfaces of the T-shaped slot 23, the connecting edges 24 are fixedly connected with the bedplate 1 through screws, and the connecting edges 24 are fixedly connected with the T-shaped slot 23, so that the T-shaped slot 23 and the bedplate 1 can be conveniently and quickly disassembled and assembled.

A through hole 26 is arranged on one side of the lower surface of the glue storage box 11, a pipe joint 15 fixedly connected with the glue storage box 11 is arranged under the through hole 26, the lower end of the pipe joint 15 is fixedly connected with a stop valve 16, the lower end of the stop valve 16 is connected with an internal thread cover 17 communicated with the stop valve 16, the internal thread cover 17 is internally connected with a transparent cylinder 12 with one sealed end, a first external thread matched with the internal thread cover 17 is processed on the outer surface of the upper end of the transparent cylinder 12, the lower surface of the glue storage box 11 is an inclined plane inclined towards the direction of the through hole 26, the lower surface of the glue storage box 11, so that the glue solution dropped in the glue storage box 11 is gathered at the through hole 26, and after the stop valve 16 is opened, the glue solution in the glue storage box 11 flows into the transparent cylinder 12, and after the stop valve 16 is closed, the transparent cylinder 12 is unscrewed from the internal thread cover 17, so that the aim of gradually transferring the glue solution in the glue storage box 11 is fulfilled.

Limiting ring 25 is fixed in through-hole 26, and limiting ring 25 upside is equipped with the filter screen 27 that can dismantle that is used for filtering solid impurity, installs the filter screen 27 that filters solid impurity in through-hole 26, and when opening stop valve 16, the solid impurity that contains in the glue solution that flows through filter screen 27 is blocked by filter screen 27 to play the effect of filtering solid impurity, be convenient for add the glue solution after filtering again in supplying gluey system, be convenient for the recovery of glue solution to recycle.

Through-hole 26 downside is equipped with internal thread circle 28, internal thread circle 28 and glue storage box 11 fixed connection, and the one end surface processing that stop valve 16 was kept away from to coupling 15 has the second external screw thread with internal thread circle 28 matched with, and coupling 15 is through second external screw thread and internal thread circle 28 threaded connection, screws into internal thread circle 28 with coupling 15 processing second external screw thread's one end in, realizes coupling 15's convenient dismouting.

Landing leg 13 all is fixed with at four edges and corners on platen 1 lower surface, and landing leg 13 lower extreme is fixed with the lug of level form, and the mounting hole that is used for alternate bolt is seted up to the lug upper surface, passes the bolt of fixed lug and installs in required position department, accomplishes the fixed of landing leg 13 position, and platen 1's position is restricted promptly.

One side of a U-shaped frame 4 is provided with glue distribution pipes 2 which are horizontally arranged and connected with a glue supply system, a plurality of branch pipes 3 which are vertically arranged are equidistantly arranged at the lower part of the outer surface of each glue distribution pipe 2, a connecting rod 7 is fixed at the outer surface of each glue distribution pipe 2, one end of each connecting rod 7, which is far away from each glue distribution pipe 2, is fixedly connected with the U-shaped frame 4, the connecting rods 7 on the glue distribution pipes 2 are fixedly connected with the U-shaped frames 4, the fixing of the positions of the glue distribution pipes 2 is completed, the glue distribution pipes 2 are in a horizontal state at the moment, the glue distribution pipes 2 are connected into the glue supply system, the glue in the glue supply system is controlled to flow into the glue distribution pipes 2, so that the glue entering the glue in the glue distribution pipes 2 drops on a shaving board on a bedplate 1 through the plurality of branch pipes 3, a driving device is used for driving the shaving board to slide along the bedplate 1, and the brush hair part, so that the brush 8 can uniformly coat the glue solution on the shaving board.

The glue coating processing equipment comprises the following specific working processes: according to the degree that the brush hair position of the brush 8 is abraded, the position of the adjusting rod 5 in the sleeve 6 on the U-shaped frame 4 is adjusted until the brush hair position of the brush 8 can be contacted with a shaving board placed on the bedplate 1 again, then the relative position of the adjusting rod 5 and the sleeve 6 is fixed by using a bolt, the convenient adjustment of the position of the brush 8 is realized, the service time of the brush 8 is prolonged, the glue distribution pipe 2 is connected into the glue supply system, the glue solution in the glue supply system is controlled to flow into the glue distribution pipe 2, the glue solution entering the glue distribution pipe 2 is dripped on the shaving board on the bedplate 1 through the plurality of branch pipes 3, the shaving board is driven to slide along the bedplate 1 by using a driving device, the brush hair position of the brush 8 is contacted with the upper surface of the shaving board, the driving device can adopt an electric push rod, an air cylinder and the like, and the brush 8 slides on, two T-shaped inserting plates 19 on a glue storage box 11 are inserted into T-shaped inserting grooves 23 on a bedplate 1 to complete the assembly of the glue storage box 11 and the bedplate 1, at the moment, the glue storage box 11 is positioned under a baffle 10, when glue solution on a shaving board is smeared by a brush 8, part of the glue solution is converged at the end part of the brush 8 through a notch 9 under the blocking of the brush 8, the glue solution converged at the end part of the brush 8 is dripped into the glue storage box 11 under the blocking of the baffle 10, the concentrated collection of the dripped glue solution is realized, and the pollution to the working environment caused by the random dripping of the glue solution is prevented.

The lower surface of the glue storage box 11 is designed into an inclined surface inclined towards the direction of the through hole 26, so that glue dripping in the glue storage box 11 is gathered at the through hole 26, after the stop valve 16 is opened, the glue in the glue storage box 11 flows into the transparent cylinder 12, after the stop valve 16 is closed, the transparent cylinder 12 is screwed off from the internal thread cover 17, and the purpose of gradually transferring the glue in the glue storage box 11 is achieved.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The production and processing technology of the shaving board uses a gluing treatment device, and is characterized in that: the method for producing and processing the shaving board by using the gluing processing equipment comprises the following steps;

step one, placing the plate to be glued on the bedplate (1), adjusting the position of the plate to be glued and fixing the plate

Step two, gluing operation, namely uniformly coating glue solution on the fixed plate through gluing processing equipment, and introducing redundant glue solution into a glue storage box (11) for storage in the gluing operation;

thirdly, solidifying glue liquid, namely taking down the plate subjected to the glue coating treatment in the second step from the bedplate (1) and horizontally placing the plate;

the gluing treatment equipment comprises a bedplate (1), wherein a U-shaped frame (4) is installed on the upper surface of the bedplate (1), two round holes (18) are symmetrically formed in the upper surface of the U-shaped frame (4), a sleeve (6) fixedly connected with the U-shaped frame (4) is arranged on the upper side of each round hole (18), vertically arranged adjusting rods (5) are arranged in the round holes (18), each adjusting rod (5) penetrates through the corresponding sleeve (6), the adjusting rods (5) are fixedly connected with the corresponding sleeve (6) through bolts, strip-shaped brushes (8) used for uniformly coating glue are fixedly connected to the lower ends of the adjusting rods (5), vertically arranged notches (9) are formed in the lower parts of two parallel side surfaces of the U-shaped frame (4), the end parts of the brushes (8) penetrate through the notches (9) and extend to the outer side of the U-shaped frame (4), and vertically arranged baffles (10) used for blocking the glue are arranged, the glue storage device is characterized in that the baffle (10) is fixedly connected with the U-shaped frame (4), a glue storage box (11) which is used for temporarily storing glue liquid and is partially positioned on the lower side of the bedplate (1) is arranged under the baffle (10), two T-shaped inserting plates (19) are symmetrically fixed at the upper part of one side surface of the glue storage box (11), T-shaped inserting grooves (23) matched with the T-shaped inserting plates (19) are fixed on the lower surface of the bedplate (1), and the T-shaped inserting plates (19) are inserted into the T-shaped inserting grooves (23);

a through hole (26) is formed in one side of the lower surface of the glue storage box (11), a pipe joint (15) fixedly connected with the glue storage box (11) is arranged right below the through hole (26), a stop valve (16) is fixedly connected to the lower end of the pipe joint (15), an internal thread cover (17) communicated with the stop valve (16) is connected to the lower end of the stop valve (16), a transparent cylinder body (12) with one sealed end is connected to the internal thread cover (17) in an internal thread mode, a first external thread matched with the internal thread cover (17) is processed on the outer surface of the upper end of the transparent cylinder body (12), and the lower surface of the glue storage box (11) is an inclined surface inclined towards the;

u type frame (4) one side is equipped with cloth rubber tube (2) that the level was arranged and was connected with the confession gluey system, cloth rubber tube (2) surface lower part position equidistance installs branch pipe (3) of a plurality of vertical arrangement, cloth rubber tube (2) surface fixed has connecting rod (7), the one end and U type frame (4) fixed connection of cloth rubber tube (2) are kept away from in connecting rod (7).

2. A process for the manufacture of particle boards according to claim 1, wherein: and a glue guiding groove (14) with the bottom inclined outwards is formed in the position where the bedplate (1) coincides with the notch (9).

3. A process for the manufacture of particle boards according to claim 1, wherein: one side of the lower surface of the T-shaped inserting plate (19) far away from the glue storage box (11) is provided with a threaded hole (21) which is vertically arranged, and a limiting bolt (22) is engaged in the threaded hole (21).

4. A process for the manufacture of particle boards according to claim 1, wherein: one side that T type picture peg (19) lower surface is close to and stores up gluey box (11) is fixed with strengthening rib (20) of slope form, the one end and the storage gluey box (11) fixed connection of T type picture peg (19) are kept away from in strengthening rib (20).

5. A process for the manufacture of particle boards according to claim 1, wherein: and the two parallel side surfaces of the T-shaped slot (23) are respectively fixed with a connecting edge (24), and the connecting edges (24) are fixedly connected with the bedplate (1) through screws.

6. A process for the manufacture of particle boards according to claim 1, wherein: through-hole (26) internal fixation has spacing ring (25), spacing ring (25) upside is equipped with the filter screen (27) of dismantling that is used for filtering solid impurity.

7. A process for the manufacture of particle boards according to claim 1, wherein: an inner thread ring (28) is arranged on the lower side of the through hole (26), the inner thread ring (28) is fixedly connected with the glue storage box (11), a second outer thread matched with the inner thread ring (28) is processed on the outer surface of one end, far away from the stop valve (16), of the pipe joint (15), and the pipe joint (15) is in threaded connection with the inner thread ring (28) through the second outer thread.

8. A process for the manufacture of particle boards according to claim 1, wherein: landing legs (13) are fixed at four edges and corners of the lower surface of the bedplate (1), horizontal bumps are fixed at the lower ends of the landing legs (13), and mounting holes for inserting bolts are formed in the upper surfaces of the bumps.