Heat exchanger tube plate machining clamp

Abstract

The utility model discloses a heat exchanger tube plate processing clamp, which comprises a base, a baffle plate, a pressing plate and a fastening bolt, the baffle plate is arranged on the base, the base is provided with a mounting hole, the mounting hole is matched with a machine tool workbench, the baffle plate comprises an upper baffle plate and two side baffle plates, the upper end of a tube plate is supported in a positioning groove of the upper baffle plate; the two sides of the tube plate are supported in the positioning grooves of the side baffles, pressing plates are installed at the upper ends of the baffles, positioning grooves are machined in the pressing plates and matched with the tube plate, the side face of the upper baffle is a face A, the vertical face of the groove of the upper baffle is a face B, the face A and the center of the tube plate keep a designed distance a, and the face B and the center of the tube plate keep a designed distance b. And the two surfaces are used as tool setting points for positioning the workpiece. The utility model has the beneficial effects that by using the clamp, the machining precision is ensured, the machining efficiency is improved, the auxiliary working hours are reduced, the production cost is reduced, and the labor intensity of operators is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger tube sheet processing, in particular to a heat exchanger tube sheet processing fixture. Background Art

[0002] According to the design requirements of most heat exchanger tube sheets, after cutting and surface contour processing, the tube sheet needs to be processed for holes, including drilling, tapping, chamfering, etc., and the size and position accuracy of these holes are high, so they need to be precisely processed using a machining center. It is not easy to directly position the circle with the edge of the workpiece, so the positioning problem before processing needs to be considered. This makes it difficult to position the tube sheet. How to process it economically and efficiently while ensuring accuracy has always been an urgent problem to be solved. Utility Model Content

[0003] The technical problem solved by the utility model is to provide a heat exchanger tube plate processing fixture, which can ensure the processing accuracy and improve the processing efficiency.

[0004] The technical solution adopted by the utility model is that the heat exchanger tube sheet processing fixture includes a base, a baffle, a pressure plate and a fastening bolt. The baffle is installed on the base. The base is provided with a mounting hole, and the mounting hole is adapted to the machine tool workbench. The baffle includes an upper baffle and two side baffles. The inner sides of the upper baffle and the side baffle are processed with positioning grooves. The top surface of the baffle is provided with a pressure plate mounting hole. The upper end of the tube sheet to be processed is supported on the positioning groove of the upper baffle, and the two sides of the tube sheet are supported on the positioning grooves of the side baffles. The fastening bolts are screwed into the pressure plate mounting holes to press the pressure plate onto the tube sheet. The pressure plate is also processed with a positioning groove. The side surface of the upper baffle is the A surface, and the vertical surface of the upper baffle groove is the B surface. The A surface maintains a designed distance a from the center of the tube sheet, and the B surface maintains a designed distance b from the center of the tube sheet.

[0005] The two side plates are parallel to each other, and the distance between the vertical surfaces of the grooves on the two side plates is equal to the diameter of the tube plate.

[0006] The beneficial effects of the utility model are that by using the clamp, the processing accuracy is guaranteed, the processing efficiency is improved, the auxiliary working hours are reduced, the production cost is reduced, and the labor intensity of the operators is alleviated. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the utility model after the tube sheet to be processed is installed.

[0008] Figure 2 for Figure 1 The corresponding left view.

[0009] Figure 3 It is a schematic diagram of the structure of the utility model.

[0010] Figure 4 for Figure 3 Corresponding left view.

[0011] Figure 5 This is the front view of the pressure plate.

[0012] Figure 6 for Figure 5 Corresponding left view.

[0013] Markings in the figure are: 1-base, 12-mounting hole, 21-upper baffle, 22-side baffle, 3-pressure plate, 31-pressure plate mounting hole, 32-positioning groove, 4-fastening bolt, 6-positioning groove, 61-vertical surface, 8-tube sheet. DETAILED DESCRIPTION

[0014] The utility model will be further described below in conjunction with the accompanying drawings.

[0015] The heat exchanger tube sheet processing fixture of the present application mainly includes a base 1, a pressure plate 3, a fastening bolt 4 and the like. Figure 1 , Figure 3 As shown. The base 1 is provided with a mounting hole 12 for mounting and fastening it on the machine tool workbench. An upper baffle 21 and two side baffles 22 are welded to the base 1; each baffle has a positioning groove 6 at the upper end of the inner side surface, which is used to position the tube sheet 8 during processing. Figure 2 and Figure 4 It can be seen that the positioning groove 6 positions the lower end surface and the side surface of the tube sheet 8; a threaded hole is provided on the top surface of the baffle for installing the fastening bolt 4, and the fastening bolt 4 fixes the pressure plate 3 on the baffle and presses the tube sheet 8 downward. The pressure plate is also provided with a positioning groove 32, and the positioning groove 32 is in contact with the upper end and side surface of the tube sheet 8. The three pressure plates 3 located on the navigation baffle 21 and the two side baffles 22 are clamped in a fixed unit from the upper end surface of the tube sheet 8.

[0016] The side of the upper baffle is the A surface, and the vertical surface 61 of the groove of the upper baffle 21 is the B surface. The distances between the A surface and the B surface and the center of the fixture, that is, the center of the tube sheet, are of specific dimensions. The A surface and the B surface are used as tool reference points for positioning the workpiece. The A surface is kept at a designed distance a from the center of the tube sheet, and the B surface is kept at a designed distance b from the center of the tube sheet. Figure 1 It can be seen that the distance b is the radius of the tube sheet, and the distance a needs to be measured and calculated. If the upper baffle 21 is installed symmetrically, a is equal to half the length of the upper baffle. At the same time, the accuracy error can be determined according to processing needs.

[0017] The top surface of the baffle is provided with a pressure plate mounting hole 31, and the pressure plate structure is as follows Figure 4 , Figure 5A bolt hole is provided in the middle, and a positioning groove 32 is processed on the side. The positioning groove 32 fits the tube sheet 8 downward and is pressed by the fastening bolt 4. The function is to clamp the tube sheet during processing and also to avoid scratches on the surface of the tube sheet.

[0018] When the fixture is used, it is first installed on the machine tool workbench. Before processing the tube sheet 8, put the tube sheet blank to be processed, the upper edge of the blank should be against the upper baffle of the fixture, and the two sides should fit naturally with the side baffles. Install the pressure plate 3 and the fastening bolts 4, and lock them to complete the workpiece clamping; use the A and B surfaces of the upper baffle 21 as the tool reference points, coordinate the workpiece, and start processing. After the processing is completed, you only need to loosen the fastening bolts without removing them to remove the processed tube sheet from the bottom.

[0019] The fixture of the present application has a simple structure, is very convenient to use, saves time and effort, can realize the processing of heat exchanger tube sheets, greatly improves processing efficiency, reduces auxiliary working hours such as machine tool positioning and clamping workpieces, reduces the labor intensity of operators, and saves production costs.

Claims

1. Heat exchanger tube sheet processing fixture, characterized by: It includes a base, a baffle, a pressure plate and fastening bolts. The baffle is installed on the base. The base is provided with a mounting hole. The mounting hole is adapted to the machine tool workbench. A pressure plate is installed on the top surface of the baffle. A pressure plate mounting hole is provided in the center of the pressure plate. The baffle includes an upper baffle and two side baffles. Positioning grooves are processed on the inner sides of the upper baffle and the side baffles. The upper end of the tube sheet to be processed is supported on the positioning groove of the upper baffle, and the two sides of the tube sheet are supported on the positioning grooves of the side baffles. The fastening bolts are screwed into the pressure plate mounting holes to press the pressure plate onto the tube sheet. Positioning grooves are also processed on the pressure plate. The side of the upper baffle is face A, and the vertical face of the upper baffle groove is face B. Face A maintains a designed distance a from the center of the tube sheet, and face B maintains a designed distance b from the center of the tube sheet.

2. The heat exchanger tube sheet processing fixture according to claim 1, characterized in that: The two side baffles are parallel to each other, and the distance between the vertical surfaces of the grooves on the two side baffles is equal to the diameter of the tube sheet.

3. The heat exchanger tube sheet processing fixture according to claim 1, characterized in that: The upper baffle and the side baffles are welded to the base.

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