Lower blade mounting structure of bar shearing machine

Abstract

The utility model discloses a lower blade mounting structure of a bar shearing machine. The stability in the shearing process is improved. A lower blade mounting structure of a bar shearing machine comprises a lower blade and a fastening bolt, mounting grooves are symmetrically formed in the two sides of the lower blade, bolt heads of the fastening bolt are of symmetrical oblate structures, each mounting groove comprises a transverse groove and a vertical groove, the transverse grooves are through grooves, the bolt heads of the fastening bolt can pass through the transverse grooves, the vertical grooves are located in the middles of the transverse grooves, and the vertical grooves are communicated with the transverse grooves. The vertical groove is a blind groove, the transverse groove and the vertical groove are perpendicularly crossed to form a cross shape, and the two ends of the bolt head are embedded and positioned in the blind groove.

Description

Technical Field

[0001] The utility model relates to the technical field of ferrous metal bar shearing, in particular to a lower blade mounting structure of a bar shearing machine. Background Art

[0002] The bar shear is a special equipment used for shearing bar materials; it can realize functions such as automatic loading, automatic feeding, automatic shearing, automatic counting, and automatic sorting of material heads and tails; it only requires one person to be on duty, saving manpower, reducing labor intensity, and effectively saving costs.

[0003] Since the quality of the end surface of the finished product after shearing depends largely on the design of the tool, the design and improvement of the shearing machine blade has also become a hot topic in recent years. For example: Wang Jichun et al. improved the blanking blade of the Q42-500 bar shearing machine (Bearing, Issue 02, 2006), and Xi Guoping et al. improved the blade of the 500T bar shearing machine (Mechanical Worker (Hot Processing) Issue 07, 1990). The above improvements to the blades of bar shears have achieved a lot of results, but they are all combined blades or inserted inserts and separated blades designed according to different outer diameter materials, and the fixing method of the blades has not been improved. This improvement takes a different approach to solve related technical problems from the aspects of simplifying blade installation, improving shearing stability, and improving work efficiency.

[0004] The original bar shear lower blade had the following problems during installation and use: (1) When installing the lower blade, the head of the fastening bolt cannot be positioned. When tightening the bolt, the operator needs to use a wrench with one hand to fix the direction of the fastening bolt and use a wrench with the other hand to tighten the nut. This makes it difficult for both hands to find the position and exert force, and the fastening bolt often rotates out of the lower blade due to changes in the position of the hands and the slippage of the wrench, requiring reinstallation. (2) When the bar shear is working, the fastening bolt often rotates slightly due to vibration, causing the nut to loosen, which in turn causes the blade to loosen and affect the position change of the blade, thereby affecting the shearing quality of the bar and the life of the blade. The fastening bolt may even rotate 90°, making the fastening completely ineffective. If this happens, it can only be re-tightened. Summary of the invention

[0005] The utility model aims to overcome the deficiencies of the prior art and provide a lower blade mounting structure for a bar shearing machine, so as to improve the stability of the lower blade during shearing.

[0006] The purpose of the utility model is achieved in this way:

[0007] A lower blade mounting structure for a bar shearing machine comprises a lower blade and a fastening bolt. Mounting grooves are symmetrically arranged on both sides of the lower blade. The bolt head of the fastening bolt is a symmetrical oblate structure. The mounting grooves comprise a transverse groove and a vertical groove. The transverse groove is a through groove. The transverse groove is for the bolt head of the fastening bolt to pass through. The vertical groove is located in the middle of the transverse groove. The vertical groove is a blind groove. The transverse groove and the vertical groove are vertically crossed to form a "cross" shape. The blind grooves are for the two ends of the bolt head to be embedded and positioned.

[0008] Preferably, the screw end of the fastening bolt is a threaded round head.

[0009] Preferably, the outer end of the transverse groove of the installation groove is open.

[0010] Preferably, the height of the bolt head of the fastening bolt is smaller than the depth of the vertical groove of the blade.

[0011] Preferably, the material of the lower blade is 9CrSi, and the material of the fastening bolt is 45 steel.

[0012] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0013] The design has vertical slots, which can accurately position the two ends of the oval bolt head to prevent loosening; the design has horizontal slots, which only need to be slightly loosened to rotate the fastening bolt so that the bolt head of the fastening bolt passes through the horizontal slot, which is easy to disassemble. Similarly, the bolt head of the fastening bolt can be inserted through the horizontal slot for installation, which only requires installation space on one side, making it easy to install. Through improvements, the blade installation is simplified and the shear stability is improved, thereby improving work efficiency.

[0014] Through the above improvements, it has been verified through mass production that the installation time of the lower blade of the bar shearing machine has been reduced from 20 minutes to 10 minutes by using the improved lower blade compared to the original lower blade; during the working process, the looseness of the lower blade is eliminated, thereby reducing the tightening time by about 30 minutes; because the looseness of the blade is eliminated, the quality of the sheared parts is improved, and at the same time, the wear of the blade is reduced, thereby increasing the life of the blade; due to the optimization of the lower blade and the fastening bolts, the production cost of the blade remains unchanged, while the production cost of the fastening bolts is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the lower blade and fastening bolts of the original bar shearing machine;

[0016] Figure 2 This is a schematic diagram of the lower blade and fastening bolt structure of the utility model.

[0017] Attached photos

[0018] In the accompanying drawings, 1 is a lower blade, 2 is a fastening bolt, 3 is a bolt head, 4 is a horizontal groove, and 5 is a vertical groove. DETAILED DESCRIPTION

[0019] A lower blade mounting structure for a bar shearing machine includes a lower blade and a fastening bolt. The lower blade is symmetrically provided with mounting grooves on both sides. The bolt head of the fastening bolt is a symmetrical oblate structure. The mounting groove includes a transverse groove and a vertical groove. The transverse groove is a through groove. The transverse groove is for the bolt head of the fastening bolt to pass through. The vertical groove is located in the middle of the transverse groove. The vertical groove is a blind groove. The transverse groove and the vertical groove are vertically crossed to form a "cross" shape. The blind groove is for the two ends of the bolt head to be embedded and positioned. The screw end of the fastening bolt is a threaded round head. The outer end of the transverse groove of the mounting groove is open. The height of the bolt head of the fastening bolt is less than the depth of the blade vertical groove. The material of the lower blade is 9CrSi, and the material of the fastening bolt is 45 steel.

[0020] Specifically:

[0021] The utility model is mainly a new type of lower blade for bar shearing machine, which is used for shearing and cutting ferrous metal in vertical bar shearing machine. The overall outer dimensions and blade size of the lower blade remain the same, but the fastening bolt installation groove is redesigned and processed from the original "U" shape to a "cross" groove. The "cross" groove is open horizontally and half open vertically. The installation center position of the "cross" groove fastening bolt is consistent with the original "U" shape center position. The length of the fastening bolt and the fastening bolt head are the same as the original, and the square clamping position of the original fastening bolt thread end is cancelled.

[0022] When installing the lower blade of a vertical bar shear, since the lower blade is inside the equipment, the fastening bolt will rotate as the nut is tightened, making it inconvenient to tighten; and during the working process, the fastening bolt will rotate due to vibration, causing the fastening to loosen, thereby affecting the use. The utility model designs a new lower blade for a bar shear, and through batch production verification, the rotation of the fastening bolt can be avoided when the fastening bolt is tightened, which simplifies the operator's fastening method, making the installation of the lower blade extremely simple, and the fastening bolt will not loosen due to vibration during the working process, improving work efficiency and stability during shearing; and the processing of making the new lower blade and fastening bolt is also simpler than before.

[0023] A new type of bar shearing machine has improved practicality of the lower blade, utility model points:

[0024] a. Change the original "U"-shaped groove of the lower blade installation fastening bolt to a "X"-shaped groove.

[0025] b. Simplify the original fastening bolts, that is, cancel the square clamping position at the threaded end. See the improved drawings for details of these two points. Figure 2 .

[0026] The present improvement will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] The specific installation steps of the lower blade of the new bar shear are as follows: a. Pre-install the fastening bolt in the lower blade pad. At this time, the fastening bolt is in a loose state. b. Place the lower blade in the installation position of the bar shear. c. After the head of the fastening bolt passes through the horizontal groove of the "cross" installation position of the lower blade, rotate the fastening bolt 90° from the outside of the equipment and tighten it. At this time, the head of the fastening bolt is just locked in the "cross" installation groove. d. Tighten the fastening bolt with a wrench outside the equipment.

[0028] The new lower blade of the bar shear obtained by adopting the above technical solution is made of 9CrSi, with a heat treatment hardness of 56-60HRC. The installation position of the fastening bolt is designed to be a "cross" shape, and the surface is required to be flat and smooth. The horizontal groove on the blade is required to be highly consistent with the opening on the equipment, which is convenient for fastening bolts to pass through and nuts to tighten. The pull rod fastening bolt is made of 45 steel material, with a heat treatment hardness of 28-32HRC. The bolt head height of the fastening bolt should be less than the slot depth of the vertical groove of the blade, otherwise it will affect the shearing work of the upper and lower blades; the square clamping position at the threaded end of the original fastening bolt is cancelled to save production costs.

[0029] The improved lower blade of the new bar shear has the following advantages: (1) The blade is more convenient and quick to install, which can effectively solve the problem of the fastening bolt being easily pulled out due to the rotation of the fastening bolt when tightening. The installation time of the lower blade is reduced from 20 minutes to 10 minutes. (2) When the bar shear is working, the fastening bolt can be fixed in the "cross" groove, which is not easy to rotate due to vibration and cause the fastening bolt to loosen, thereby eliminating the 2-4 times of shutdown for tightening due to loose fastening bolts in each shift. (3) The "cross" groove plays a certain positioning role, which can avoid the lateral displacement of the blade, significantly improve the quality of the product end face, and increase the life of the blade. (4) The fastening bolt eliminates the square clamping position, reducing the production process and production cost. Through mass production application, the improved lower blade of the new bar shear is extremely convenient to install, reduces the labor intensity of the operator, greatly improves the production quality, blade life and efficiency, and greatly reduces the production cost.

[0030] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A lower blade mounting structure for a bar shearing machine, comprising a lower blade and a fastening bolt, wherein mounting grooves are symmetrically arranged on both sides of the lower blade, and characterized in that: The bolt head of the fastening bolt is a symmetrical oblate structure. The mounting groove includes a transverse groove and a vertical groove. The transverse groove is a through groove for the bolt head of the fastening bolt to pass through. The vertical groove is located in the middle of the transverse groove. The vertical groove is a blind groove. The transverse groove and the vertical groove cross vertically to form a "cross" shape. The blind groove is for the two ends of the bolt head to be embedded and positioned.

2. The lower blade mounting structure of a bar shearing machine according to claim 1, characterized in that: The screw end of the fastening bolt is a threaded round head.

3. The lower blade mounting structure of a bar shearing machine according to claim 1, characterized in that: The outer end of the transverse groove of the installation groove is open.

4. The lower blade mounting structure of a bar shearing machine according to claim 1, characterized in that: The height of the bolt head of the fastening bolt is smaller than the depth of the vertical groove of the blade.

5. The lower blade mounting structure of a bar shearing machine according to claim 1, characterized in that: The material of the lower blade is 9CrSi, and the material of the fastening bolt is 45 steel.

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