JPS6321372Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a frame structure for a brick press that has a high rigidity and can sufficiently withstand bumping forming (repetitive forming) performed in modern brick forming.

[Conventional technology]

As shown in FIG. 4, a conventional brick molding press, particularly a hydraulic press, has frames 31 and 33 which are secured to four pillars 30 with a circular cross section by tightening nuts 32 and 34 at their respective ends. The ram 35 is raised and lowered by sliding along the circumferential surface of the column 30 using a bush 37 of a pressure block 36 to which the ram 35 is attached as a guide. However, with the change of times, the bricks molded by brick presses have also shifted from tar dolomite type to magcarbon type, for example, and as a matter of course, there have been major changes in the molding method. That is, when molding tar dolomite bricks, the bricks could be molded by applying the maximum molding pressure as designed by the hydraulic press to the material for a considerable period of time.
However, when magcarbon bricks came into use, the conventional method of applying maximum pressure to the material for a long time was unable to reach the desired density, and in extreme cases it was necessary to apply the maximum pressure to the material over a dozen times or even several dozen times. It has been determined that it can only be molded by bumping molding (repetitive molding), which is now the current standard of practice. The size of bricks has also increased year by year, and the number of bricks with shapes that are prone to uneven loads has also increased, so it is necessary to consider fundamental measures to address these problems, especially for large presses with an output of 1,000 tons or more. Ta.

Frame breakage frequently occurs due to fatigue failure caused by a one-digit increase in the number of repetitions, and rapid bumping is caused by the elastic deformation of the frame and deformation due to oil compression, as shown in Figure 4. It has been found that the conventional press having a flexible frame structure with so-called four pillars is no longer able to sufficiently transmit pressure to the raw material.

[Problem that the invention attempts to solve]

Therefore, the present invention can withstand harsh usage conditions such as bumping molding and uneven loads.
The purpose of this invention is to provide a frame structure for a brick press that has much greater rigidity than conventional presses.

As a frame for a hydraulic press for making bricks, a combination frame made of cast steel or welded steel plates is advantageous in terms of strength and manufacturing cost.
For example, frames 38, 39 having simple uneven parts as shown in FIG.
40 and 41 can also be constructed by fastening them with bolts, but in such a structure, stress may be concentrated at the corners of the recess due to long-term pressurization work, causing cracks.
This may cause looseness due to the settling of the pressurized contact surface.
This reduces the supporting capacity of the frame, and there is a high possibility that the frame will eventually be destroyed. Therefore, the fifth
It was found that the structure shown in the figure could not be put to practical use.

[Means and actions for solving problems]

According to the present invention, in the structure of a frame of a brick press having a frame made of cast steel or welded steel plate, the joint part that joins the upper and lower frames and both side frames is formed wider than the frame main body, and the joint part is cut with a saw blade. A groove-shaped metal fitting is attached to the protruding part of the joint on both sides of the frame, and each joint is firmly attached to each frame by applying an initial load in the vertical and horizontal directions with a wedge. is combined with

Therefore, although the structure is simple, it is possible to obtain a press frame structure with high rigidity that can sufficiently withstand the stress during press forming due to the initial load and can be adapted to severe working conditions such as bumping forming. can.

The present invention will be explained below based on the embodiments shown in FIGS. 1 to 3.

FIG. 1A is a partially sectional side view of the first embodiment of the present invention, with 1 and 14 showing upper and lower frames, and 5 and 18 showing left and right side frames. They are firmly connected in the manner described below. The upper frame 1 is provided with a ram 15 operated by a hydraulic cylinder, and the lower end of the ram 15 is provided with left and right side frames 5, 18.
A pressure block 7 that slides up and down along an upper guide 8 is fixed, and furthermore, an upper punch 9 for brick molding is attached to the lower side of the pressure block 7. A rail 21 is provided at the lower part of the side frames 5, 18 and is connected to a rail (not shown) extending from the brick extraction position to the press. A cart 10 loaded with raw materials for bricks runs on the rails 21.

The upper and lower frames 1 and 14 and the left and right side frames 5 and 18 are provided with corresponding coupling portions, respectively. The joint portion has a width greater than the width of each frame (length in the direction perpendicular to the drawing), and both ends protrude from the sides of each frame (see FIG. 3). Each joint is formed with a corresponding serration. As shown in the figure, the saw blade-shaped part has a structure in which one side of the blade is horizontal and the other side is sloped, and when the ram is operated, hydraulic pressure acts on the upper and lower frames 1, 1.
4 receives a reaction in the vertical direction, the left and right side frames 5,
18 is now accepted. The upper and lower frames 1 and 14 and the left and right side frames 5 and 18 are connected by frame fastening bolts 4 and 13, but an initial load (prestress) is applied to them in order to resist the force acting in the vertical direction. That is, immediately below or directly above the upper and lower frames 1 and 14 of the left and right side frames 5 and 18, stepped portions 19 and 20 extending in the width direction are provided in the frames.
An upper wedge 6 and a lower wedge 17 are driven into the upper side of the step 9 and the lower side of the stepped portion 20, respectively. Therefore, the upper and lower frames 1 and 14 are subjected to downward pressing force from the beginning by the left and right frames 5 and 18. Therefore, the reaction force applied to the upper and lower frames 1, 14 is canceled out by the initial load. In addition to the tightening force of the frame fastening bolts 4 and 13, an initial load is also applied in the horizontal direction. That is, the left and right protrusions 2 of each frame
2, 23, 24, 25 are fitted with groove-shaped upper and lower clasps 3, 12, respectively, and are fixed to each frame by bolts 16. Upper side wedges 2, 2' and lower side wedges 11 are driven between the clasps 3, 12 and the protrusions 23 of the left and right frames 5, 18. Therefore, from the upper and lower frames 1 and 14 to the left and right side frames 5,
The force trying to separate 18 is counteracted by the fastening force of the wedges 2, 2', 3 in addition to the force of the bolts 4, 13.

In this embodiment, the structure of the frame joint is considerably more complex and more expensive to manufacture than that of FIG. In addition to being able to be dispersed into
Furthermore, by applying an initial load using a wedge, the connection between the frames can be strengthened.
By making the cross-sectional shape of the frame itself box-shaped (see Figure 1), rigidity has been greatly improved, and the reduction in the actual pressing force due to frame elongation has become minimal, resulting in a remarkable improvement in brick molding work. There is expected. Furthermore, since the frame is in contact with the foundation on the entire bottom of the left and right side frames, the installation area is large, which is advantageous against impact during bumping molding, and the pressurizing force is distributed over the entire contact surface. Therefore, excessive concentration of stress due to uneven load is avoided. .

FIG. 2 is a partially sectional side view of a second embodiment of the present invention. This embodiment has the same frame structure as the first embodiment shown in FIG. 1, except that the type of press is a friction press, and the same parts are designated by the same reference numerals. Therefore, the effects brought about by the structure of the frame are the same as those of the first embodiment.

FIG. 3 is a partially cutaway perspective view of a third embodiment of the present invention. This embodiment also has a substantially similar structure to the first and second embodiments, and the same parts are designated by the same reference numerals. The only difference is that the rail 21' is large and has a convex cross section, and its bottom is inserted between the lower wedge 17 and the lower frame 14. There is no difference in operation and effect from the above two embodiments.

[Effects of the invention] Since the invention is constructed as described above, although it has a relatively simple structure, the connections between each frame part are strong, the overall rigidity is significantly strengthened, and it is resistant to bumping molding and unbalanced loads. It is possible to obtain an excellent frame structure for a brick press that is sufficiently durable, thereby greatly contributing to improving product quality and reducing production costs.

[Brief explanation of the drawing]

FIG. 1A is a partially sectional side view showing an embodiment of the present invention; FIG. 1B is a YY sectional view of A; FIG. 2 is a partially sectional side view showing another embodiment of the present invention; FIG. 3 is a partially removed perspective view of yet another embodiment of the present invention, and FIG. 4A is a cross-sectional side view showing a conventional press.
FIG. 4(b) is a cross-sectional view taken along the line X-X of (a), and FIG. 5 is a side view for explaining one method of assembling the frame. 1... Upper frame, 2, 2'... Upper side wedge, 3... Upper stopper, 4... Frame fastening bolt, 5... Left side frame, 6... Upper wedge, 7
...Pressure block, 8...Guide, 9...
... Upper punch, 10 ... Metal frame, 11 ... Lower side wedge, 12 ... Lower stopper, 13 ... Frame fastening bolt, 14 ... Lower frame, 15 ... Ram, 16 ... Stopper bolt, 17...Lower wedge,
18... Right side frame, 19, 20... Step part, 21... Rail, 22, 23, 24, 25...
...Protrusion, 30...Column, 31, 33...Frame, 32, 34...Nut, 35...Hydraulic ram,
36... Pressure block, 37... Push, 38, 39, 40, 41... Frame.

Claims (1)

[Scope of utility model registration request] In the frame structure of a brick press having a frame made of cast steel or welded steel plate, the joint part that joins the upper and lower frames and both side frames is formed wider than the frame main body, and the joint part is joined through a saw blade-like structure. A frame for a brick press, characterized in that groove-shaped metal fittings are attached to the protruding parts on both sides of the frame at the joint parts, and each joint part is firmly connected to each frame by applying an initial load with a wedge. structure.