Narrow space counter bore machining device

Abstract

The invention discloses a narrow space counter bore machining device, which belongs to the technical field of machining and comprises a back scraper connected with a cutter bar. A cushion block, two thrust bearing assemblies and a large nut are sequentially sleeved on the cutter bar below the back scraper; the lower part of the cutter bar is in threaded connection with the large nut; a cam mechanism is arranged between the two thrust bearing assemblies and used for driving the distance between the two thrust bearing assemblies to be increased when the cam mechanism rotates. The outer side of the cam mechanism is connected with a driving part; and a screwing head is arranged at the lower end of the cutter bar. Large equipment such as a machine tool is not used, a manual cutting device is adopted, the outer contour of the device is reduced as much as possible, the occupied space is small, the back scraper can rotate and axially move at the same time, counter bore cutting can be carried out in a narrow space, the machining precision is guaranteed, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a narrow space countersink processing device. Background Art

[0002] In the machinery industry, countersinking of mounting holes is a common requirement. This process is typically performed by front machining or reverse backscraping. However, due to limited space and location, some holes cannot be machined using conventional equipment or methods. Manual machining is necessary, but existing technology lacks tools for manual machining, resulting in relatively low precision and efficiency. Summary of the Invention

[0003] In order to overcome the shortcomings of the background technology, the present invention provides a countersinking processing device for a narrow space. The purpose is to use a manual cutting device without using large equipment such as machine tools, with a hand electric drill as the power source, to reduce the outer contour of the countersinking processing device as much as possible, so that countersinking cutting can be performed in a narrow space, ensuring processing accuracy and improving processing efficiency.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a narrow space countersink processing device, comprising a back scraper; the back scraper is detachably connected to the top end of a tool rod; below the back scraper, a pad, two thrust bearing assemblies and a large nut are sequentially mounted on the tool rod; the lower portion of the tool rod is provided with an external thread for threaded connection to the large nut; a cam mechanism is provided between the two thrust bearing assemblies for driving the distance between the two thrust bearing assemblies to increase when the cam mechanism rotates; a driving component is connected to the outside of the cam mechanism for driving the cam mechanism to rotate; a screwing head is provided at the lower end of the tool rod for connecting a screwing tool.

[0005] As a further optimization, the cam mechanism includes a cam support sleeve and a cam frame; the cam support sleeve is sleeved on the knife rod; the cam frame includes two identical cam plates, which are fixed into a whole by a connecting plate between the upper parts of the two cam plates; the two cam plates are hinged to the left and right ends of the cam support sleeve, and when the cam frame rotates, the upper and lower ends of the cam plates support the two thrust bearing assemblies to increase the distance.

[0006] As a further optimization, the cam support sleeve has a cubic shape and is hollow inside. It has through holes at its upper and lower ends, axial holes at its left and right ends, and square holes at its front and rear ends. A pin hole is provided in the middle of the two cam plates. The two pin holes correspond to the two axial holes and are used to pass two rotating pins through the pin holes and the axial holes and then connect small nuts to hinge the cam frame and the cam support sleeve. The two through holes are used for the tool rod to pass through the cam support sleeve. The two square holes are used to place the rotating pin into the interior of the cam support sleeve and allow one end of it to pass through the axial hole.

[0007] As a further optimization, the outer edge of the cam plate includes a second plane and a third plane at the upper and lower ends, and a lift curved surface is located between the second plane and the third plane; when the cam plate is in the initial position, the second plane and the third plane respectively abut the two thrust bearing assemblies, and when the cam plate rotates, the lift curved surface pushes the two thrust bearing assemblies to increase the distance between them.

[0008] As a further optimization, the driving component is a handle or a pull rope connected to the connecting plate.

[0009] As a further optimization, the thrust bearing assembly includes a thrust ball bearing and a support pad, both of which can be mounted on the tool rod; the cam mechanism is clamped between the two support pads; and the outer sides of the two thrust ball bearings respectively abut against the pad and the large nut.

[0010] As a further optimization, a guide sleeve is further included which is sleeved on the knife rod, and the guide sleeve is located between the back scraper and the pad.

[0011] As a further optimization, the side wall of the large nut is connected to a set screw, and the side wall of the shank is provided with a first plane corresponding to the set screw, which is used to lock the large nut when the end of the set screw is pressed against the first plane.

[0012] As a further optimization, a slot is provided at the top of the blade rod for clamping the back scraper.

[0013] The advantage of the present invention is that it does not use large equipment such as machine tools, but adopts a manual cutting device, which reduces the outer contour of the device as much as possible, does not occupy the space above the hole on the part, and occupies as little space below the hole on the part as possible. The back scraper can be made to rotate and move axially at the same time, so that countersinking cutting can be performed in a small space, ensuring processing accuracy and improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of Example 1 of the present invention when cutting parts;

[0015] Figure 2 Exploded schematic view of the three-dimensional structure of Embodiment 2 of the present invention;

[0016] Figure 3 Schematic view of the structure after assembly of Embodiment 2 of the present invention;

[0017] Figure 4 Schematic view of the structure of the tool shank of Embodiment 2 of the present invention;

[0018] Figure 5 Schematic view of the structure of the cam plate of Embodiment 2 of the present invention;

[0019] Figure 6 Schematic view of the structure of the cam support sleeve of Embodiment 2 of the present invention.

[0020] In the figure: 1, back scraping cutter; 2, guide sleeve; 3, spacer block; 4, thrust ball bearing; 5, support pad; 6, tool shank; 61, card slot; 62, first plane; 63, screwing head; 7, rotary pin; 8, small nut; 9, cam support sleeve; 91, through hole; 92, shaft hole; 93, square hole; 10, set screw; 11, large nut; 12, cam bracket; 121, cam plate; 1211, second plane; 1212, third plane; 1213, lift curve; 122, connecting plate; 13, handle; part 14; upper surface 141 of the part; hole 142 on the part; lower surface 143 of the part; right-angle adapter 15, electric hand drill 16. Detailed implementation manners

[0021] The following combines the drawings 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 some preferred embodiments of the present invention, rather than all embodiments. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0022] Embodiment 1; Please refer to Figure 1 .

[0023] This embodiment provides a counterbore machining device for narrow spaces. When in use, reference can be made to Figure 1 , including a back scraping cutter 1; the back scraping cutter 1 is detachably connected to the top end of the tool shank 6; below the back scraping cutter 1, a spacer block 3, two thrust bearing assemblies and a large nut 11 are sequentially sleeved on the tool shank 6; the lower part of the tool shank 6 is provided with an external thread for threadedly connecting the large nut 1; a cam mechanism is provided between the two thrust bearing assemblies for driving the distance between the two thrust bearing assemblies to increase when the cam mechanism rotates; the outside of the cam mechanism is connected with a driving component for driving the cam mechanism to rotate; the lower end of the tool shank 6 is provided with a screwing head for connecting a screwing tool.

[0024] The operating steps of this counterbore machining device are as follows: Before use, first place the cam mechanism in the initial position, bring the two thrust bearing assemblies closer to each other, then remove the back scraper 1, and then pass the tool shank 6 through the hole 142 in the part from the lower surface 143 of the part until the tool shank 6 extends beyond the upper surface 141 of the part. Then install the back scraper 1 on the tool shank 6. By adjusting the position of the large nut 11, make the spacer block 3 tightly fit against the lower surface 143 of the part, and the back scraper 1 tightly fit against the upper surface 141 of the part. After preparation, one person operates the screwing tool to drive the tool shank 6 to drive the back scraper 1 to rotate; one person operates the driving component to drive the cam mechanism to rotate, increase the distance between the two thrust bearing assemblies, and force the back scraper 1 to move downward to cut the upper surface 141 of the part to obtain a counterbore.

[0025] Among them, the screwing tool can be selected according to the size of the space, such as a manual wrench, an electric wrench, a handwheel, etc. In this embodiment, Figure 1 the right-angle adapter and the electric drill shown are combined into a screwing tool. However, the structure of the screwing tool can be selected according to needs, not limited to Figure 1 the structure shown. The driving component can be selected according to the size of the space, such as a handle or a pull rope. However, the structure of the driving component can be selected according to needs, not limited to Figure 1 the structure shown. In this embodiment, the driving component is preferably a handle. Grasp the handle to control the cam mechanism to insert between the two thrust bearing assemblies and manipulate the cam mechanism to rotate. The cam mechanism has a lift curve. When the cam mechanism rotates, the lift curve pushes a pair of thrust bearing assemblies to increase the distance between them. The orientation of the handle is not limited to Figure 1 the structure shown and can be close to or far from the screwing tool according to needs. Moreover, the cam mechanism can be not connected to the tool shank 6 and is only used when machining the counterbore. Through the setting of a pair of thrust bearing assemblies, when the tool shank 6 rotates, the spacer block 3 and the cam mechanism do not rotate, reducing the wear of these two components and extending their service life. Especially for protecting the cam mechanism from wear is more important. In this embodiment, the thrust bearing assembly selects a thrust ball bearing 4 and a support plate 5 to cooperate, but the structure of the thrust bearing assembly can be selected according to needs, not limited to Figure 1 the structure shown.

[0026] The advantages of this embodiment are that it does not use large equipment such as machine tools, adopts a manual cutting device, minimizes the outer contour of the counterbore machining device as much as possible, does not occupy the space above the hole 142 in the part, and occupies as little space as possible below the hole 142 in the part. It can make the back scraper 1 move axially while rotating, so that counterbore cutting can be carried out in a narrow space, ensuring the machining accuracy and improving the machining efficiency.

[0027] Example 2, please refer to Figures 1-6 .

[0028] The present embodiment provides the following technical solution: A counterbore machining device for narrow spaces, having a tool shank 6, on which a back scraping tool 1, a guide sleeve 2, a spacer 3, a thrust ball bearing 4, a support pad 5, a cam support sleeve 9, a cam bracket 12, and a large nut 11 are installed from top to bottom. The tool shank 6 is provided with two card slots 61. After the back scraping tool 1 is inserted and rotated to the card slots 61, rapid clamping can be achieved. The tool shank 6 is also provided with a section of thread for installing the large nut 11, and a first flat surface 62 is provided at the thread for the set screw 10 to clamp the large nut 11. The tool shank 6 is provided with a screwing head 63 for connecting to the power source required for rotating the tool shank 6. The guide sleeve 2 has a clearance fit with the hole to be machined and serves as a guide. The length dimension of the guide sleeve 2 is the remaining depth of the final finished hole after counterbore machining. Whether the counterbore is machined in place can be judged by observing whether the guide sleeve 2 is flush with the lower end of the finished hole. And the guide sleeve 2 can also be used as a limiting component to automatically control the depth of the counterbore. The spacer 3 has a clearance fit with the tool shank 6, with its upper end surface abutted against the part 14 and its lower end surface in contact with the thrust ball bearing 4. The thrust ball bearing 4 is installed at the upper and lower ends of the cam bracket 12 to make the force transmission and the up-and-down linear motion more stable and safe. The support pad 5 has a clearance fit with the tool shank 6 and is installed between the cam bracket 12 and the thrust ball bearing 4, always keeping in close contact with the cam surface. The cam support sleeve 9 has a clearance fit with the tool shank 6 and is installed between the two support pads 5. The cam support sleeve 9 is provided with a hole for installing a rotary pin 7. The cam bracket 12 is welded and composed of two cam plates 121 and a connecting plate 122. The cam bracket 12 is connected to the cam support sleeve 9 through the rotary pin 7 and connected by a small nut 8. The middle of the cam plate 121 is provided with a hole for installing the rotary pin 7. The cam plate 121 is also provided with a second flat surface 1211 and a third flat surface 1212. When the cam bracket 12 is in the initial position, the second flat surface 1211 and the third flat surface 1212 are in contact with the support pad 5. The cam plate 121 is provided with a lift curve surface 1213. When the cam plate 121 rotates counterclockwise, the contact between the plane of the cam plate 121 and the support pad 5 in the initial position is gradually converted into the contact between the cam lift curve surface 1213 and the support pad 5. At this time, the rotational motion of the cam plate 121 is transmitted to the support pad 5 and converted into a linear motion along the axis direction of the tool shank 6, making the back scraping tool 1 closely adhere to the end surface of the hole to be machined. The connecting plate 122 is connected to the two cam plates 121 by welding to form the cam bracket 12. The connecting plate 122 is provided with a threaded hole for installing a handle 13. The large nut 11 is installed at the thread of the tool shank 6 for roughly adjusting the machining stroke of the entire mechanism. The side of the large nut 11 is also provided with a threaded hole for installing the set screw 10. The handle 13 is installed on the connecting plate 122, and the rotational motion of the cam plate 121 is controlled by the up-and-down movement of the handle 13.

[0029] Among them, compared with Embodiment 1, the cam mechanism in this embodiment is equivalent to the cam support sleeve 9 and the cam frame 12. The difference in this embodiment is that the cam support sleeve 9 is sleeved on the tool bar 6; the cam frame 12 includes two identical cam plates 121, which are integrally connected by a connecting plate 122 between the upper parts of the two cam plates 121; the two cam plates 121 are hinged to the left and right ends of the cam support sleeve 9. When the cam frame 12 rotates, the upper and lower ends of the cam plate 121 abut against the two thrust bearing assemblies to increase the spacing. It can be seen that the cam mechanism in this embodiment is sleeved on the tool bar 6, which is more convenient to carry and use than Embodiment 1.

[0030] Among them, the cam frame 12 and the cam support sleeve 9 can be connected by a hinge shaft fixed on the side wall of the cam support sleeve 9 to achieve hinging. At this time, the hinged cam plate 121 and the cam support sleeve 9 cannot be disassembled. For the convenience of maintenance and replacement, in this embodiment, the cam support sleeve 9 has a cubic shape, its interior is hollow, it is provided with through holes 91 at its upper and lower ends, shaft holes 92 at its left and right ends, and square holes 93 at its front and rear ends; there are pin holes in the middle of the two cam plates 121; the two pin holes correspond to the two shaft holes 92, and are used to connect the small nuts 8 by passing two rotary pins 7 through the pin holes and the shaft holes 92 to hinge the cam frame 12 and the cam support sleeve 9; the two through holes 91 are used for the tool bar 6 to pass through the cam support sleeve 9; the two square holes 93 are used to put the rotary pin 7 into the interior of the cam support sleeve 9 so that one end of it passes out of the shaft hole 92. At this time, the cam frame 12, the cam support sleeve 9, and the rotary pin 7 are all detachable, which is more convenient to use.

[0031] More specifically about the principle of the cam mechanism driving the spacing between a pair of thrust bearing assemblies to increase, the outer edge of the cam plate 121 includes a second plane 1211 and a third plane 1212 at the upper and lower ends, and a lift curve surface 1213 is between the second plane 1211 and the third plane 1212; when the cam plate 121 is in the initial position, the second plane 1211 and the third plane 1212 respectively abut against the two thrust bearing assemblies. When the cam plate 121 rotates, the two thrust bearing assemblies are pushed by the lift curve surface 1213 to increase their spacing.

[0032] Among them, exemplarily, the thrust bearing assembly includes a thrust ball bearing 4 and a support pad 5 that can both be sleeved on the tool bar 6; the cam mechanism is clamped between the two support pads 5; the outer sides of the two thrust bearing assemblies respectively abut against the spacer block 3 and the large nut 11.

[0033] Among them, a clamping groove 61 is provided at the top end of the tool bar 6 for clamping the back scraper 1, so that the back scraper 1 is replaceable, and different sizes of back scrapers 1 can be selected according to needs.

[0034] Among them, in order to improve the machining accuracy and reduce the swing of the tool shank 6 during rotation, the hole 142 on the part is used as a limit, and a guide sleeve 2 sleeved on the tool shank 6 is further included. The guide sleeve 2 is located between the back scraping tool 1 and the spacer block 3. The guide sleeve 2 is located in the gap between the tool shank 6 and the hole 142 on the part, playing a role of guiding and limiting.

[0035] Among them, in order to prevent the large nut 11 from loosening, a set screw 10 is connected to the side wall of the large nut 11, and a first plane 62 corresponding to the set screw 10 is provided on the side wall of the tool shank 6, which is used to lock the large nut 11 when the end of the set screw 10 abuts against the first plane 62.

[0036] Compared with Embodiment 1, the advantages of this embodiment are that each component is detachable and replaceable, with better adaptability and more convenient use.

[0037] Embodiment 3, please refer to Figures 1-6 。

[0038] The difference between this embodiment and Embodiment 2 is that instead of using the handle 13, a pull rope is used as the driving component to drive the cam frame 12 to rotate. Specifically, one end of the pull rope is tied to the connecting plate 122, and the other end is tied to the operator's foot. The cam frame 12 is rotated by stepping on it, liberating the operator's hands, and only the rotation of the tool shank 6 needs to be controlled. Thus, the device can be operated by one person, saving more labor, and the pull rope can occupy less space than the handle 13, and can be applied to a narrower space.

[0039] The parts not described in detail in the present invention are prior art; for those of ordinary skill in the art, the technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should be considered as falling within the scope described in this specification. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A counterbore machining device for narrow spaces, comprising a back scraper (1); the back scraper (1) is detachably connected to the top end of a tool rod (6); characterized in that: Below the back scraper (1), a spacer block (3), two thrust bearing assemblies and a large nut (11) are sequentially sleeved on the tool shank (6); an external thread is provided at the lower part of the tool shank (6) for threadedly connecting the large nut (11); a cam mechanism is provided between the two thrust bearing assemblies for increasing the distance between the two thrust bearing assemblies when the cam mechanism rotates; a driving component is connected to the outside of the cam mechanism for driving the cam mechanism to rotate; a screwing head (63) is provided at the lower end of the tool shank (6) for connecting a screwing tool.

2. The reaming device for small-space counterbores according to claim 1, characterized in that: The cam mechanism includes a cam support sleeve (9) and a cam frame (12); the cam support sleeve (9) is sleeved on the tool shank (6); The cam frame (12) includes two identical cam plates (121), which are integrally fixed by a connecting plate (122) between the upper parts of the two cam plates (121); the two cam plates (121) are hinged to the left and right ends of the cam support sleeve (9), and when the cam frame (12) rotates, the upper and lower ends of the cam plate (121) abut against the two thrust bearing assemblies to increase the distance.

3. The reamed hole machining device for narrow spaces according to claim 2, characterized in that: The cam support sleeve (9) has a cubic shape, is hollow inside, has through holes (91) at its upper and lower ends, shaft holes (92) at its left and right ends, and square holes (93) at its front and rear ends; Pin holes are provided in the middle of the two cam plates (121); the two pin holes correspond to the two shaft holes (92) for connecting the cam frame (12) and the cam support sleeve (9) by passing two rotary pins (7) through the pin holes and the shaft holes (92) and then connecting a small nut (8). The two through holes (91) are for the tool shank (6) to pass through the cam support sleeve (9); the two square holes (93) are for putting the rotary pin (7) into the inside of the cam support sleeve (9) so that one end of it can pass out from the shaft hole (92).

4. The narrow space countersink processing device according to claim 3, characterized in that: The outer edge of the cam plate (121) includes a second plane (1211) and a third plane (1212) at its upper and lower ends, and a lift curve surface (1213) is between the second plane (1211) and the third plane (1212); when the cam plate (121) is in the initial position, the second plane (1211) and the third plane (1212) respectively abut against the two thrust bearing assemblies, and when the cam plate (121) rotates, the two thrust bearing assemblies are pushed by the lift curve surface (1213) to increase the distance therebetween.

5. A counterbore machining device for narrow spaces according to claim 2, characterized in that: The driving component is a handle (13) or a pull rope connected to the connecting plate (122).

6. The reaming device for small-space counterbores according to claim 1, characterized in that: The thrust bearing assembly includes a thrust ball bearing (4) and a support pad (5) that can both be sleeved on the tool shank (6); the cam mechanism is clamped between the two support pads (5); the outer sides of the two thrust ball bearings (4) respectively abut against the spacer block (3) and the large nut (11).

7. A counterbore machining device for narrow spaces according to claim 1, characterized in that: It further includes a guide sleeve (2) sleeved on the tool shank (6), and the guide sleeve (2) is located between the back scraper (1) and the spacer block (3).

8. A machining device for counterbores in a narrow space according to claim 1, characterized in that: A set screw (10) is connected to the side wall of the large nut (11). A first flat surface (62) corresponding to the set screw (10) is provided on the side wall of the tool shank (6) for locking the large nut (11) when the end of the set screw (10) abuts against the first flat surface (62).

9. The counterbore machining device for narrow spaces according to claim 1, characterized in that: A clamping groove (61) is provided at the top end of the tool shank (6) for clamping the back scraping cutter (1).

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