Positioning device for processing safety tongue of large hook

Abstract

The utility model discloses a positioning device for large hook safety tongue machining. The positioning device comprises an L-shaped bottom plate, a plurality of clamping grooves are formed in the edge of the bottom plate, two positioning holes are formed in the outer surface of the bottom plate, one positioning hole is connected with a positioning mandrel, the other positioning hole is connected with a core rod, and a positioning cover is connected to the outer portion of the core rod in a clamped mode. The positioning device adopts a position positioning and end face positioning mode, the degree of freedom of the safety tongue in the Z direction is limited through end face positioning, it is guaranteed that the whole center of the safety tongue is in a horizontal state, the degree of freedom of the safety tongue in the XY plane is limited through position positioning, and it is guaranteed that the safety tongue is accurately positioned; the design requirements for the size, the form and location tolerance and the surface quality of the safety tongue are met, the size and the form and location tolerance of the safety tongue are effectively guaranteed, the surface quality and the machining efficiency are improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing fixtures, and in particular relates to a positioning device for processing a large hook safety tongue. Background Art

[0002] The big hook is a part of the oil drilling lifting system and is suspended under the traveling pulley. In order to prevent the heavy objects from falling off, a safety tongue is designed on the big hook, which can play a certain blocking role when the heavy objects shake.

[0003] The safety tongue is a key component of the lifting hook, but the arc of the safety tongue is the direct load-bearing part. The arc surface of the safety tongue needs to be clamped and positioned twice to complete the processing. The processing quality is very important, and a reasonable positioning method needs to be selected.

[0004] The positioning method in the prior art is to directly clamp the safety tongue for intuitive alignment, but this method cannot directly find the clamping and positioning position, which affects the processing efficiency; and the prior art cannot limit the X, Y, and Z degrees of freedom of the safety tongue, resulting in reference error problems during subsequent processing; thus, the processing accuracy and roughness of the arc surface of the safety tongue become low. Utility Model Content

[0005] The utility model aims to provide a positioning device for processing a large hook safety tongue, which solves the problem in the prior art that the safety tongue cannot be limited in three-dimensional degrees of freedom, resulting in reference errors in subsequent processing.

[0006] The technical solution adopted by the utility model is a positioning device for processing a large hook safety tongue, comprising an L-shaped base plate, a plurality of slots being provided at the edge of the base plate, two positioning holes being provided on the outer surface of the base plate, one positioning hole being connected to a positioning core shaft, the other positioning hole being connected to a core rod, and a positioning cover being clamped on the outside of the core rod.

[0007] The utility model is also characterized in that:

[0008] The radial diameter of the positioning hole is 22mm to 24mm;

[0009] The connection modes of the positioning mandrel and the core rod with the positioning hole are all threaded connection;

[0010] The positioning mandrel comprises a mandrel body, a circular positioning surface is fixedly connected to the outer surface of the mandrel body, an external thread body is fixedly connected to the end of the mandrel body, and a fastening nut is threadedly connected to the external thread body;

[0011] The positioning cover comprises a hollow rectangular window, a circular through hole is formed at the top of the window, a disc is fixedly connected to one end of the window away from the through hole, a suction magnet is fixedly connected to the bottom of the disc, and a core rod passes through the through hole and is inserted into the positioning hole.

[0012] The beneficial effects of the utility model are:

[0013] 1. The positioning device for processing the large hook safety tongue of the utility model adopts the method of position positioning and end face positioning. The end face positioning limits the freedom of the safety tongue in the Z direction to ensure that the overall center of the safety tongue is in a horizontal state. The position positioning limits the freedom of the safety tongue in the X and Y planes to ensure accurate positioning of the safety tongue.

[0014] 2. The positioning device of the utility model can realize rapid positioning and alignment under the premise of meeting the technical requirements of the workpiece, thereby improving the processing efficiency. The positioning is fast and reliable, and the operation is simple, which greatly improves the processing accuracy and processing efficiency of the product;

[0015] 3. The positioning device of the utility model solves the problem of the safety tongue being aligned when being processed on a milling machine, meets the design requirements of the safety tongue size, form and position tolerance and surface quality, effectively ensures the size and form and position tolerance of the safety tongue, improves the surface quality and processing efficiency, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the positioning device for processing the safety tongue of a large hook of the utility model;

[0017] Figure 2 It is a side view of the positioning device of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the positioning mandrel in the positioning device of the utility model;

[0019] Figure 4 It is a structural schematic diagram of a positioning cover in the positioning device of the utility model;

[0020] Figure 5 It is a schematic diagram of the positions of the bottom plate and the safety tongue in the positioning device of the utility model.

[0021] In the figure, 1. bottom plate, 2. slot, 3. positioning hole, 4. positioning mandrel, 401. mandrel body, 402. positioning surface, 403. external threaded body, 404. fastening nut, 5. core rod, 6. positioning cover, 601. window, 602. through hole, 603. disk, 604. suction magnet. DETAILED DESCRIPTION

[0022] The utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0023] Example 1

[0024] like Figure 1As shown, this embodiment provides a positioning device for processing a large hook safety tongue, including an L-shaped bottom plate 1, with a plurality of slots 2 provided at the edge of the bottom plate 1, the slots 2 being used to connect and fix with the machine tool workbench, and limiting the freedom of the safety tongue in the Z direction through end face positioning, ensuring that the overall center of the safety tongue is in a horizontal state. Two positioning holes 3 are provided on the outer surface of the bottom plate 1, and the radial diameter of the positioning holes 3 is 22 mm to 24 mm.

[0025] like Figure 2 , Figure 3 As shown, a positioning hole 3 is connected to a positioning spindle 4, and the positioning spindle 4 includes a spindle body 401. The diameter of the spindle body 401 is the same as the diameter of the hole on the conventional safety tongue, which saves the cost of processing the safety tongue hole and directly performs positioning.

[0026] A circular positioning surface 402 is fixedly connected to the outer surface of the core shaft body 401 for placing a safety tongue. An external threaded body 403 is fixedly connected to the end of the core shaft body 401. The external threaded body 403 is threadedly connected to a fastening nut 404. The fastening nut 404 is tightly attached to the base plate 1. The overall height of the positioning core shaft 4 can be adjusted by the fastening nut 404 according to actual needs, and the effect of further fixing the positioning core shaft 4 can be achieved.

[0027] Another positioning hole 3 is connected with a core rod 5, and the positioning core shaft 4 and the core rod 5 are connected to the positioning hole 3 by threaded connection. Position positioning limits the freedom of the safety tongue in the X and Y planes, ensures accurate positioning of the safety tongue, solves the problem of inverted alignment of the safety tongue during milling, meets the design requirements of the safety tongue size, shape and position tolerance and surface quality, effectively ensures the size and shape and position tolerance of the safety tongue, improves surface quality and processing efficiency, and reduces production costs.

[0028] The core rod 5 is externally clamped with a positioning cover 6; Figure 4 As shown, the positioning cover 6 includes a hollow rectangular window 601, a circular through hole 602 is formed at the top of the window 601, a disc 603 is fixedly connected to one end of the window 601 away from the through hole 602, an attractive magnet 604 is fixedly connected to the bottom of the disc 603, and the core rod 5 passes through the through hole 602 and is inserted into the positioning hole 3. The core rod 5 fixes the safety tongue, and is adsorbed on the safety tongue by the attractive magnet 604 at the bottom of the positioning cover 6, so as to enhance the stability of the core rod 5 and prevent the core rod 5 from being damaged during milling.

[0029] The working process of the utility model is as follows:

[0030] like Figure 5As shown, when used for processing, the base plate 1 is connected and fixed to the machine tool workbench through the slot 2, the positioning mandrel 4 and the core rod 5 are threadedly connected and fixed to the base plate 1 through the positioning hole 3, the positioning mandrel 4 is fixed by the fastening nut 404, and after the processed hole on the surface of the safety tongue is aligned with the positioning hole 3, the safety tongue passes through the positioning mandrel 4 and the core rod 5; so that the safety tongue is flat on the surface of the positioning surface 402, and the positioning cover 6 is sleeved on the core rod 5, and the upper surface of the safety tongue is adsorbed to achieve the purpose of positioning the workpiece and clamping.

[0031] Example 2

[0032] The present embodiment provides a positioning device for processing a large hook safety tongue, comprising an L-shaped base plate 1, a plurality of slots 2 being provided at the edge of the base plate 1, two positioning holes 3 being provided on the outer surface of the base plate 1, one positioning hole 3 being connected to a positioning core shaft 4, the other positioning hole 3 being connected to a core rod 5, and a positioning cover 6 being clamped on the outside of the core rod 5.

[0033] Example 3

[0034] On the basis of Example 2, the radial diameter of the positioning hole 3 is 22 mm to 24 mm; the connection modes of the positioning core shaft 4 and the core rod 5 to the positioning hole 3 are both threaded connections.

Claims

1. The positioning device for processing the safety tongue of the big hook is characterized by: The invention comprises an L-shaped bottom plate (1), a plurality of slots (2) are provided at the edge of the bottom plate (1), two positioning holes (3) are provided on the outer surface of the bottom plate (1), one of the positioning holes (3) is connected to a positioning mandrel (4), the other positioning hole (3) is connected to a core rod (5), and a positioning cover (6) is clamped on the outside of the core rod (5).

2. The positioning device for processing the large hook safety tongue according to claim 1, characterized in that: The radial diameter of the positioning hole (3) is 22 mm to 24 mm.

3. The positioning device for processing the large hook safety tongue according to claim 1, characterized in that: The positioning core shaft (4) and the core rod (5) are connected to the positioning hole (3) by threaded connection.

4. The positioning device for processing the large hook safety tongue according to claim 1, characterized in that: The positioning mandrel (4) comprises a mandrel body (401), the outer surface of which is fixedly connected with a circular positioning surface (402), the end of which is fixedly connected with an external threaded body (403), and the external threaded body (403) is threadedly connected with a fastening nut (404).

5. The positioning device for processing the large hook safety tongue according to claim 1, characterized in that: The positioning cover (6) comprises a hollow rectangular window (601), a circular through hole (602) is provided at the top of the window (601), a disc (603) is fixedly connected to one end of the window (601) away from the through hole (602), an attractive magnet (604) is fixedly connected to the bottom end of the disc (603), and the core rod (5) passes through the through hole (602) and is inserted into the positioning hole (3).

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