Positioning clamp for turning inner hole of casting

Abstract

The utility model relates to the technical field of positioning clamps, in particular to a positioning clamp for turning an inner hole of a casting, which comprises a base, a bearing seat fixedly connected to the top end of the base, a bearing fixedly connected in a through hole on the bearing seat, a rotating sleeve rotatably connected in the bearing, a sliding frame fixedly connected to the end part of the rotating sleeve, and a lead screw rotatably connected to the sliding frame. Two sliding blocks are connected to the lead screw in a threaded mode, the sliding blocks are connected with the sliding frame in a sliding mode, and clamps are fixedly connected to the two sliding blocks. The fixing stability of castings is improved, the distance between the clamps can be adjusted according to the castings of different sizes, so that the positioning structure can adapt to the castings of different sizes, operation is flexible, easy and convenient, the working efficiency is improved, the applicability of inner hole turning machinery is improved, clamps of various sizes do not need to be prepared, and the practicability is high. The cost is saved, the structure is simple, and later overhaul and maintenance are facilitated.

Description

Technical Field

[0001] The utility model relates to a positioning fixture, in particular to a positioning fixture for turning inner holes of castings, belonging to the technical field of positioning fixtures. Background Art

[0002] A fixture is a commonly used tool in the machining process, used to fix the workpiece to ensure machining accuracy and stability. There are many types of fixtures, the most common ones are machining fixtures, welding fixtures, measuring fixtures, etc. Existing precision castings have different shapes, and some precision castings also require turning inner holes, so the castings need to be positioned using positioning fixtures.

[0003] Most cylindrical castings are fixed by three-jaw chucks. Although they have good stability, their internal structure is complicated and requires high machining accuracy. In addition, the transmission components are wrapped inside the three-jaw chuck, which affects the efficiency of inspection and maintenance. Therefore, a positioning fixture for turning the inner hole of the casting is needed. Utility Model Content

[0004] The purpose of the utility model is to provide a positioning fixture for inner hole turning of castings in order to solve the above-mentioned problem, which not only improves the stability of casting fixation, but also can adjust the distance between the fixtures according to castings of different sizes so that the positioning structure can adapt to castings of different sizes. The operation is flexible and simple, which improves work efficiency and expands the applicability of inner hole turning machinery. There is no need to prepare fixtures of various sizes, which saves costs. The utility model has a simple structure and is convenient for later inspection and maintenance.

[0005] The utility model achieves the above-mentioned purpose through the following technical scheme: a positioning fixture for turning the inner hole of a casting, comprising a base, the top end of the base is fixedly connected to a bearing seat, the through hole on the bearing seat is fixedly connected to a bearing, a rotating sleeve is rotatably connected to the bearing, the end of the rotating sleeve is fixedly connected to a positioning structure, the positioning structure comprises a slide frame, the end of the rotating sleeve is fixedly connected to the slide frame, the slide frame is rotatably connected to a screw rod, the screw rod is threadedly connected to two sliders, the sliders are slidably connected to the slide frame, the two sliders are fixedly connected to a fixture, the interior of the rotating sleeve is fixedly connected to a rotating shaft, and one end of the rotating shaft is connected to a power structure through a coupling.

[0006] Preferably, the sliding frame is in a rectangular structure and is arranged in a vertical direction.

[0007] Preferably, the threads at both ends of the screw rod are in opposite directions, and the two sliders and the two clamps are symmetrically distributed about the middle of the screw rod.

[0008] Preferably, both ends of the screw rod are fixedly connected with a knob, and a plurality of circular holes are arranged in a circular array on the knob.

[0009] Preferably, the outer ring of the bearing is fixedly connected to the bearing seat, the inner ring of the bearing is fixedly connected to the rotating sleeve, and the outer ring of the bearing is rotatably connected to the rotating sleeve via balls in the bearing.

[0010] Preferably, the top end of the bearing abuts against a fixing sleeve, the fixing sleeve is fixedly connected to the top end of the bearing seat, and the fixing sleeve is in a semicircular structure.

[0011] Preferably, the end of the rotating shaft is fixedly connected to a coupling, the other end of the coupling is fixedly connected to a power structure, the power structure includes a motor shaft, the other end of the coupling is fixedly connected to the motor shaft, and the end of the motor shaft is fixedly connected to a motor.

[0012] Preferably, a mounting seat is fixedly connected to the top of the base, a through hole on the mounting seat is in the same horizontal plane as the through hole on the bearing seat, a motor shaft is rotatably connected in the through hole of the mounting seat, and a motor is fixedly connected to one side of the mounting seat.

[0013] Preferably, four waist-shaped grooves are provided on the base, two of which are distributed on both sides of the bearing seat, and the other two are distributed on both sides of the mounting seat.

[0014] The beneficial effects of the utility model are as follows: the end of the rotating sleeve is fixedly connected to a sliding frame, the sliding frame is rotatably connected to a screw rod, the screw rod is threadedly connected to two sliding blocks, the sliding blocks are slidably connected to the sliding frame, and the two sliding blocks are fixedly connected to clamps; when the inner holes of different castings are turned, the screw rod is rotated, and the screw rod thread drives the two sliding blocks to move in opposite directions in the sliding frame, and the movement of the slider drives the two clamps to move toward the center of the screw rod, and the screw rod is continuously rotated until the two clamps are pressed against the casting, thereby realizing the positioning of the casting, which not only improves the stability of the casting fixation, but also can adjust the distance between the clamps according to castings of different sizes so that the positioning structure can adapt to castings of different sizes, is flexible and easy to operate, improves work efficiency, and expands the applicability of the inner hole turning machine, does not need to prepare clamps of various sizes, saves costs, and has a simple structure, which is convenient for later inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a cross-sectional view of the whole of the utility model;

[0017] Figure 3 for Figure 2 An enlarged view of section A is shown;

[0018] Figure 4It is a schematic diagram of the connection structure between the screw rod and the sliding frame of the utility model.

[0019] In the figure: 1. base; 2. waist-shaped groove; 3. bearing seat; 4. fixed sleeve; 5. rotating shaft; 6. rotating sleeve; 7. positioning structure; 701. sliding frame; 702. knob; 703. round hole; 704. clamp; 705. slider; 706. screw rod; 8. coupling; 9. power structure; 901. motor shaft; 902. motor; 10. mounting seat; 11. bearing. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-Figure 4 As shown, a positioning fixture for turning the inner hole of a casting comprises a base 1, the top of the base 1 is fixedly connected to a bearing seat 3, a bearing 11 is fixedly connected in a through hole on the bearing seat 3, a rotating sleeve 6 is rotatably connected in the bearing 11, a positioning structure 7 is fixedly connected to the end of the rotating sleeve 6, the positioning structure 7 comprises a sliding frame 701, the end of the rotating sleeve 6 is fixedly connected to the sliding frame 701, a screw rod 706 is rotatably connected to the sliding frame 701, two sliders 705 are threadedly connected to the screw rod 706, the sliders 705 are slidably connected to the sliding frame 701, and a fixture 704 is fixedly connected to the two sliders 705, the sliding frame 701 is a rectangular structure, the sliding frame 701 is arranged in a vertical direction, a rotating shaft 5 is fixedly connected to the inside of the rotating sleeve 6, and one end of the rotating shaft 5 is connected to the power structure 9 through a coupling 8; when different castings are processed When performing inner hole turning, insert a screwdriver or other tool into the round hole 703 on the knob 702, and use the screwdriver to drive the knob 702 to rotate, and the knob 702 drives the screw rod 706 to rotate. Since the threads at both ends of the screw rod 706 are opposite, the screw rod 706 threads drive the two sliders 705 to move in opposite directions in the slide frame 701, and the movement of the slider 705 drives the two clamps 704 to move toward the center of the screw rod 706. The screw rod 706 is continuously rotated until the two clamps 704 are pressed against the casting, thereby realizing the positioning of the casting, which not only improves the stability of the casting fixation, but also can adjust the distance between the clamps 704 according to the castings of different sizes so that the positioning structure 7 can adapt to the castings of different sizes. The operation is flexible and simple, which improves the work efficiency and expands the applicability of the inner hole turning machine. There is no need to prepare clamps 704 of various sizes, saving costs.

[0022] As a technical optimization solution of the utility model, the thread directions at both ends of the screw rod 706 are opposite, and the two sliders 705 and the two clamps 704 are symmetrically distributed about the middle of the screw rod 706; thereby, the two sliders 705 respectively drive the two clamps 704 to move toward the center of the screw rod 706, thereby realizing the positioning function of the casting.

[0023] As a technical optimization solution of the present invention, both ends of the screw rod 706 are fixedly connected with knobs 702 , and a plurality of circular holes 703 are arranged in a circular array on the knob 702 ; the arrangement of the knob 702 facilitates the rotation of the screw rod 706 .

[0024] As a technical optimization scheme of the utility model, the outer ring of the bearing 11 is fixedly connected to the bearing seat 3, the inner ring of the bearing 11 is fixedly connected to the rotating sleeve 6, and the outer ring of the bearing 11 is rotatably connected to the rotating sleeve 6 through the balls in the bearing 11; the setting of the bearing seat 3 supports the rotating sleeve 6, and the bearing 11 has the characteristics of small sliding resistance, low power consumption, and easy starting. Since the outer ring of the bearing 11 and the rotating sleeve 6 achieve low friction rotation through the rolling of the balls in the bearing 11, the friction resistance during the movement of the rotating sleeve 6 is reduced, making the rotating sleeve 6 rotate more smoothly and not easy to be damaged.

[0025] As a technical optimization solution of the utility model, the top end of the bearing 11 is in contact with a fixing sleeve 4, and the fixing sleeve 4 is fixedly connected to the top end of the bearing seat 3, and the fixing sleeve 4 is a semicircular structure; after the bearing 11 is installed on the bearing seat 3, the two ends of the fixing sleeve 4 are fixed to the top end of the bearing seat 3 by screws. At this time, the inner side of the fixing sleeve 4 is in contact with the bearing 11 downward, thereby cooperating with the bearing seat 3 to fix the bearing 11.

[0026] As a technical optimization scheme of the present utility model, the end of the rotating shaft 5 is fixedly connected with a coupling 8, and the other end of the coupling 8 is fixedly connected with a power structure 9, and the power structure 9 includes a motor shaft 901, and the other end of the coupling 8 is fixedly connected with the motor shaft 901, and the end of the motor shaft 901 is fixedly connected with a motor 902; when the casting is fixed, the motor 902 is started, the motor 902 drives the motor shaft 901 to rotate, the motor shaft 901 drives the coupling 8 to rotate, the coupling 8 drives the rotating shaft 5 to rotate, the rotating shaft 5 drives the rotating sleeve 6 to rotate, the rotating sleeve 6 drives the positioning structure 7 to rotate, thereby driving the casting to rotate, thereby realizing the inner hole turning of the casting; the setting of the coupling 8 can reduce the uneven wear of the rotating shaft 5 and the motor shaft 901 caused by installation errors and mechanical failures caused by vibration and noise, and improve the stability of the connection between the rotating shaft 5 and the motor shaft 901.

[0027] As a technical optimization solution of the utility model, a mounting seat 10 is fixedly connected to the top of the base 1, the through hole on the mounting seat 10 is on the same horizontal plane as the through hole on the bearing seat 3, a motor shaft 901 is rotatably connected in the through hole of the mounting seat 10, and a motor 902 is fixedly connected to one side of the mounting seat 10; this facilitates the installation of the motor 902 and the motor shaft 901, so that the motor shaft 901 can be conveniently connected to the rotating shaft 5 through the coupling 8, thereby providing rotational power.

[0028] As a technical optimization solution of the utility model, four waist-shaped grooves 2 are opened on the base 1, two of which are distributed on both sides of the bearing seat 3, and the other two are distributed on both sides of the mounting seat 10; the setting of the waist-shaped grooves 2 facilitates the installation of the machine.

[0029] When the utility model is in use, first when turning the inner holes of different castings, a screwdriver or other tool is inserted into the round hole 703 on the knob 702, and the knob 702 is driven to rotate by the screwdriver, and the knob 702 drives the screw rod 706 to rotate. Since the threads at both ends of the screw rod 706 are opposite, the screw rod 706 threads drive the two sliders 705 to move in opposite directions in the slide frame 701, and the movement of the slider 705 drives the two clamps 704 to move toward the center of the screw rod 706, and the screw rod 706 is continuously rotated until the two clamps 704 are pressed against the casting, thereby realizing the positioning of the casting, which not only improves the stability of the casting fixation, but also can adjust the distance between the clamps 704 according to the castings of different sizes, so that the positioning structure 7 can adapt to the castings of different sizes, the operation is flexible and simple, the work efficiency is improved, and the applicability of the inner hole turning machine is expanded, and there is no need to prepare clamps 704 of various sizes. , saving costs; when the casting is fixed, start the motor 902, the motor 902 drives the motor shaft 901 to rotate, the motor shaft 901 drives the coupling 8 to rotate, the coupling 8 drives the rotating shaft 5 to rotate, the rotating shaft 5 drives the rotating sleeve 6 to rotate, the rotating sleeve 6 drives the positioning structure 7 to rotate, thereby driving the casting to rotate, thereby realizing the inner hole turning of the casting; the setting of the coupling 8 can reduce the uneven wear of the rotating shaft 5 and the motor shaft 901 caused by installation errors and mechanical failures caused by vibration and noise, and improve the stability of the connection between the rotating shaft 5 and the motor shaft 901; the setting of the bearing seat 3 supports the rotating sleeve 6, and the bearing 11 has the characteristics of small sliding resistance, low power consumption, easy starting, etc., because the outer ring of the bearing 11 and the rotating sleeve 6 realize low friction rotation through the rolling of the balls in the bearing 11, the friction resistance during the movement of the rotating sleeve 6 is reduced, so that the rotating sleeve 6 rotates more smoothly and is not easy to be damaged.

[0030] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A positioning fixture for turning inner holes of castings, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to a bearing seat (3), a bearing (11) is fixedly connected in a through hole on the bearing seat (3), a rotating sleeve (6) is rotatably connected in the bearing (11), an end of the rotating sleeve (6) is fixedly connected to a positioning structure (7), the positioning structure (7) comprises a sliding frame (701), an end of the rotating sleeve (6) is fixedly connected to the sliding frame (701), a screw rod (706) is rotatably connected to the sliding frame (701), two sliders (705) are threadedly connected to the screw rod (706), the sliders (705) are slidably connected to the sliding frame (701), and the two sliders (705) are fixedly connected to a clamp (704), the interior of the rotating sleeve (6) is fixedly connected to a rotating shaft (5), and one end of the rotating shaft (5) is connected to a power structure (9) via a coupling (8).

2. A positioning fixture for inner hole turning of a casting according to claim 1, characterized in that: The sliding frame (701) is in a rectangular structure and is arranged in a vertical direction.

3. The positioning fixture for inner hole turning of a casting according to claim 1, characterized in that: The threads at both ends of the screw rod (706) are in opposite directions, and the two sliders (705) and the two clamps (704) are symmetrically distributed about the middle of the screw rod (706).

4. A positioning fixture for inner hole turning of a casting according to claim 3, characterized in that: Both ends of the screw rod (706) are fixedly connected to a knob (702), and a plurality of circular holes (703) are arranged in a circular array on the knob (702).

5. The positioning fixture for inner hole turning of a casting according to claim 1, characterized in that: The outer ring of the bearing (11) is fixedly connected to the bearing seat (3), the inner ring of the bearing (11) is fixedly connected to the rotating sleeve (6), and the outer ring of the bearing (11) is rotatably connected to the rotating sleeve (6) via balls in the bearing (11).

6. A positioning fixture for turning inner holes of castings according to claim 5, characterized in that: The top end of the bearing (11) abuts against a fixing sleeve (4), the fixing sleeve (4) is fixedly connected to the top end of the bearing seat (3), and the fixing sleeve (4) is in a semicircular structure.

7. The positioning fixture for inner hole turning of a casting according to claim 1, characterized in that: The end of the rotating shaft (5) is fixedly connected to a coupling (8), the other end of the coupling (8) is fixedly connected to a power structure (9), the power structure (9) comprises a motor shaft (901), the other end of the coupling (8) is fixedly connected to the motor shaft (901), and the end of the motor shaft (901) is fixedly connected to a motor (902).

8. A positioning fixture for turning inner holes of castings according to claim 6, characterized in that: The top end of the base (1) is fixedly connected to a mounting seat (10); a through hole on the mounting seat (10) and a through hole on the bearing seat (3) are on the same horizontal plane; a motor shaft (901) is rotatably connected in the through hole of the mounting seat (10); and a motor (902) is fixedly connected to one side of the mounting seat (10).

9. A positioning fixture for turning inner holes of castings according to claim 1, characterized in that: The base (1) is provided with four waist-shaped grooves (2), two of which are distributed on both sides of the bearing seat (3), and the other two are distributed on both sides of the mounting seat (10).

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