Pull rod device for preventing scrap iron from entering workpiece and finish turning pull rod assembly

Abstract

The utility model discloses a pull rod device and a finish turning pull rod assembly for preventing scrap iron from entering a workpiece, which comprise a pin shaft, one end of the pin shaft is provided with threads, and the other end of the pin shaft is connected with a pull rod; a thread fastener is arranged on the thread of the pin shaft; the pin shaft is sleeved with an elastic piece, a baffle and an adjusting ring, the baffle is arranged between the elastic piece and the adjusting ring, and the adjusting ring is arranged between the baffle and the threaded fastener. When a workpiece is installed in the finish turning pull rod assembly, the elastic piece pushes the baffle, the baffle is made to be tightly attached to the inner wall of the workpiece under the action of elastic force, the through hole in the baffle is completely blocked, the effect of preventing scrap iron from entering a large hole of an air cylinder is achieved, and it is guaranteed that an expansion block is always kept clean in the machining process and after machining is completed. The action that an operator cleans the clamp through an air tap after original workpiece machining is completed is omitted, the product quality is improved, it is guaranteed that an inner hole of a product is not damaged by clamping, and radial jump, end jump and coaxiality are qualified.

Description

Technical Field

[0001] The utility model belongs to the technical field of finishing turning fixtures, and in particular relates to a drawbar device for preventing iron chips from entering into a workpiece and a finishing turning drawbar assembly. Background Art

[0002] At present, the finishing turning fixtures in the same industry at home and abroad generally use the expansion block tensioning method to clamp the inner hole of the workpiece for processing. In this way of clamping the workpiece, after the processing of this process is completed, the operator must use cleaning tools such as air nozzles to thoroughly clean the expansion block so that no foreign matter such as iron filings remains. Otherwise, after the finishing process is completed, the parts will have adverse consequences such as surface clamping of the inner hole of the parts, radial runout, and end runout. If the parts have coaxiality requirements, there will also be coaxiality tolerance problems.

[0003] The patent announcement number is CN 215881331 U, and the name is a patent application for an expansion sleeve type clamp, which includes a spindle, an expansion sleeve arranged around the outer ring of the spindle, a transmission rod, a pressure plate, a rotating rod and a lever, the two ends of the transmission rod are respectively connected to the pressure plate and the spindle, one end of the lever is connected to the rotating rod, and the other end is inserted into a slot arranged on the transmission rod, a second transmission rod mounting hole is arranged on the spindle, and a rotating rod mounting groove matching the outer contour of the rotating rod is arranged on the hole wall of the second transmission rod mounting hole, one end of the rotating rod is arranged in the rotating rod mounting groove, and the other end is arranged outside the spindle and below the expansion sleeve; a protrusion for squeezing the expansion sleeve is arranged on the rotating rod. The transmission rod and the rotating rod of the utility model can be mutually locked and will not fall off under the series connection of the lever, and the up and down movement of the transmission rod is converted into the rotational movement of the rotating rod, and the expansion sleeve can be interfered with by the reciprocating rotation of the protrusion on the rotating rod; when the clamp is working, a closed space is formed inside the spindle to prevent iron filings from entering the spindle. Although this patent application can also prevent iron filings from entering, its scope of application is small and its structure is complex. Utility Model Content

[0004] In order to overcome the problems existing in the prior art of ordinary fine turning fixtures, the purpose of the utility model is to provide a pull rod device and a fine turning pull rod assembly for preventing iron chips from entering the interior of a workpiece. A baffle, an adjustment ring, an elastic part, a pin shaft, and a threaded fastener are added to the end face of the pull rod of the universal expansion block fine turning fixture to prevent iron chips from entering the interior of the workpiece. The structure is simple and can be adapted to universal expansion blocks.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A pull rod device for preventing iron filings from entering the interior of a workpiece, comprising a pin shaft, one end of the pin shaft having a thread, and the other end being connected to a pull rod; a threaded fastener is arranged on the thread of the pin shaft; an elastic member, a baffle and an adjusting ring are arranged outside the pin shaft, the baffle is arranged between the elastic member and the adjusting ring, and the adjusting ring is arranged between the baffle and the threaded fastener.

[0007] Optionally, the inner diameter of the adjusting ring is greater than or equal to the diameter of the through hole of the baffle; and the inner diameter of the threaded fastener is smaller than the outer diameter of the adjusting ring.

[0008] Optionally, the number of the threaded fasteners is two.

[0009] Optionally, the threaded fastener is a nut.

[0010] Optionally, the elastic member is a spring.

[0011] Optionally, the pin shaft includes a threaded portion and a smooth portion, the threaded fastener is arranged on the threaded portion, and the baffle and the adjusting ring are arranged on the smooth portion.

[0012] A finishing rod assembly comprises an expansion block and a rod device for preventing iron filings from entering a workpiece, wherein one end of the pin shaft away from the threaded fastener is connected to the rod through an interference fit through a blind hole of the rod, and the workpiece is mounted on the expansion block.

[0013] Optionally, the expansion block is replaced by an expansion sleeve.

[0014] Optionally, the workpiece has an inner cavity hole in the center, and the diameter of the inner cavity hole of the workpiece is smaller than the diameter of the baffle.

[0015] Optionally, the baffle is circular.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] When the workpiece is loaded into the precision turning tie rod assembly, the elastic part pushes the baffle plate, so that the baffle plate is tightly attached to the inner wall of the workpiece under the action of elastic force, and the through hole on it is completely blocked, thereby playing the role of blocking iron filings from entering the large hole of the cylinder, ensuring that the expansion block is always kept clean during and after processing. The original action of the operator using the air nozzle to clean the fixture after the workpiece is processed is cancelled, which improves the product quality, ensures that the inner hole of the product is not clamped, and the diameter jump, end jump and coaxiality are qualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of a pull rod device for preventing iron chips from entering the utility model;

[0020] Figure 2 This is a schematic diagram of the precision turning tie rod assembly of the utility model;

[0021] Among them: 1. Pull rod; 2. Expanding block; 3. Elastic part; 4. Baffle; 5. Adjusting ring; 6. Nut; 7. Pin; 8. Workpiece. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] The utility model is described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1As shown, a pull rod device for preventing iron filings from entering the interior of a workpiece of the utility model comprises a pin shaft 7, one end of the pin shaft 7 has a thread, and the other end is connected to a pull rod 1. A threaded fastener 6 is arranged on the thread of the pin shaft 7. An elastic member 3, a baffle 4 and an adjustment ring 5 are arranged on the outer sleeve of the pin shaft 7, the baffle 4 is arranged between the elastic member 3 and the adjustment ring 5, and the adjustment ring 5 is arranged between the baffle 4 and the threaded fastener 6. The baffle 4 and the adjustment ring 5 both have a through hole with a diameter greater than the diameter of the pin shaft 7, and the baffle 4 and the adjustment ring 5 can slide on the pin shaft 7. The inner diameter of the adjustment ring 5 is greater than or equal to the through hole diameter of the baffle 4; the inner diameter of the threaded fastener 6 is smaller than the outer diameter of the adjustment ring 5. By adjusting the threaded fastener 6, the adjustment ring 5 can be pushed, so that the adjustment ring 5 pushes the baffle 4, and the tightness of the elastic member 3 can be adjusted by adjusting the position of the baffle 4.

[0027] Optionally, the number of the threaded fasteners 6 is two, wherein the threaded fastener 6 close to the adjusting ring 5 is used to adjust the position of the adjusting ring 5, and the threaded fastener 6 away from the adjusting ring 5 is used to prevent the other threaded fastener 6 and the adjusting ring 5 from falling off.

[0028] Specifically, the threaded fastener 6 is a nut. Specifically, the elastic member 3 is a spring.

[0029] Specifically, the pin 7 includes a threaded portion and a smooth portion, the threaded fastener 6 is arranged on the threaded portion, and the baffle 4 and the adjustment ring 5 are arranged on the smooth portion. The adjustment ring 5 can transmit the thrust of the threaded fastener 6 while ensuring smooth sliding of the baffle 4.

[0030] A finishing rod assembly comprises a rising block 2 and a rod device for preventing iron chips from entering. The end of the pin shaft 7 away from the threaded fastener 6 is connected to the rod 1 through a blind hole of the rod 1 by interference fit, and a workpiece 8 is installed on the rising block 2. The workpiece 8 has an inner cavity hole in the center, and the diameter of the inner cavity hole of the workpiece 8 is smaller than the diameter of the baffle 4. The diameter of the rod 1 is smaller than the diameter of the through hole of the rising block 2, and the baffle 4 is larger than the diameter of the through hole of the rising block 2.

[0031] Optionally, the expansion block 2 can be replaced by an expansion sleeve.

[0032] Optionally, the baffle 4 is circular or regular polygonal.

[0033] When the utility model is used, the following steps are included: when the workpiece 8 is loaded into the lathe fixture body, the elastic member 3 pushes the baffle plate 4, so that the baffle plate 4 is tightly attached to the inner wall of the workpiece 8 under the action of elastic force, and the through hole thereon is completely blocked, thereby preventing iron filings from flying from the outside of the workpiece 8 into the inside of the workpiece 8, ensuring that the expansion block 2 in the inner cavity of the workpiece is clean, ensuring that the inner cavity hole of the workpiece 8 is not clamped, and the radial runout and end runout are qualified, and the coaxiality is qualified.

[0034] Example

[0035] Combine the following Figure 2 The specific implementation methods of the utility model are further described.

[0036] In this embodiment, the workpiece 8 belongs to the range block cylinder JS220-1707062-1 of our company. When the range block cylinder is finely processed and clamped, the elastic member 3 pushes the baffle 4, so that the baffle 4 is close to the inner wall of the workpiece 8 under the action of elastic force, and the through hole on it is completely blocked, which plays a role in blocking the iron filings from entering the large hole of the cylinder, ensuring that the expansion block 2 is always clean during and after processing. The original action of the operator using the air nozzle to clean the fixture after the processing is completed is cancelled, and more importantly, the product quality is improved, ensuring that the inner hole of the product is not clamped, and the diameter jump, end jump, and coaxiality are qualified.

[0037] Unless otherwise specified, the device elements involved in the above embodiments are all conventional device elements, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A pull rod device for preventing iron filings from entering a workpiece, characterized in that: The invention comprises a pin shaft (7), one end of the pin shaft (7) having a thread, and the other end of the pin shaft (7) being connected to a pull rod (1); a threaded fastener (6) is arranged on the thread of the pin shaft (7); an outer sleeve of the pin shaft (7) is provided with an elastic member (3), a baffle (4) and an adjustment ring (5); the baffle (4) is arranged between the elastic member (3) and the adjustment ring (5), and the adjustment ring (5) is arranged between the baffle (4) and the threaded fastener (6).

2. A pull rod device for preventing iron filings from entering the interior of a workpiece according to claim 1, characterized in that: The inner diameter of the adjustment ring (5) is greater than or equal to the diameter of the through hole of the baffle (4); and the inner diameter of the threaded fastener (6) is smaller than the outer diameter of the adjustment ring (5).

3. A pull rod device for preventing iron filings from entering a workpiece according to claim 1, characterized in that: The number of the threaded fasteners (6) is two.

4. A pull rod device for preventing iron filings from entering the interior of a workpiece according to claim 1, characterized in that: The threaded fastener (6) is a nut.

5. A pull rod device for preventing iron filings from entering the interior of a workpiece according to claim 1, characterized in that: The elastic member (3) is a spring.

6. A pull rod device for preventing iron filings from entering the interior of a workpiece according to claim 1, characterized in that: The pin shaft (7) comprises a threaded portion and a smooth portion, the threaded fastener (6) is arranged on the threaded portion, and the baffle (4) and the adjustment ring (5) are arranged on the smooth portion.

7. A finishing rod assembly, characterized in that: It comprises an expansion block (2) and a pull rod device for preventing iron chips from entering the interior of a workpiece as claimed in any one of claims 1 to 6, wherein one end of the pin shaft (7) away from the threaded fastener (6) is connected to the pull rod (1) by interference fit through a blind hole on the pull rod (1), and a workpiece (8) is mounted on the expansion block (2).

8. A finishing rod assembly according to claim 7, characterized in that: The expansion block (2) is replaced by an expansion sleeve.

9. The finish turning tie rod assembly according to claim 7, characterized in that: The workpiece (8) has an inner cavity hole at the centre, and the diameter of the inner cavity hole of the workpiece (8) is smaller than the diameter of the baffle (4).

10. A finishing rod assembly according to claim 7, characterized in that: The baffle (4) is circular.

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