Step type inner cooling drill bit

Abstract

The utility model belongs to the technical field of inner cooling drill bits, and particularly relates to a step type inner cooling drill bit which comprises a connecting rod and a spiral head fixedly connected to one side of the connecting rod, a backflow preventing mechanism is arranged in the connecting rod, and an inner cooling mechanism is arranged in the spiral head. The backflow preventing mechanism comprises a connecting pipe, a limiting block, an annular sealing belt, a sealing ball, a mounting plate, a stop block and a spring. The inner cooling mechanism comprises a first spiral pipeline, a second spiral pipeline and a chip groove. According to the step type inner cooling drill bit, through the arranged backflow preventing mechanism, cooling liquid passes through an inner cavity of a limiting block, after the cooling liquid overcomes the resilience force of a spring, a sealing ball is pressed downwards, the cooling liquid can flow into the limiting block and is conveyed to a spiral pipeline through a connecting pipe, when the hydraulic pressure of the cooling liquid is reduced, the spring can generate the resilience force after being compressed, and therefore the cooling liquid can flow into the limiting block; and the sealing ball blocks one side of the annular sealing belt again, backflow of the cooling liquid is avoided, and meanwhile the situation that the cooling liquid flows back along with part of chippings, and consequently the spiral pipeline is blocked is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of internally cooled drill bits, in particular to a stepped internally cooled drill bit. Background Art

[0002] Drilling refers to the operation of using a drill bit to make a hole in a solid material. Here we describe the drilling work in exploration work, as well as the auxiliary tools required for drilling and some emergency measures. In order to meet the different existing construction requirements, it is necessary to be equipped with a professional stepped composite drill bit.

[0003] The existing stepped drill bits are designed to reduce the damage to the drill bit and the product appearance caused by the high heat generated when the stepped drill bit rotates at high speed. However, the existing stepped composite drill bits with internal cooling channels, when used for processing deeper holes, have insufficient coolant volume and liquid level, which can easily lead to overheating of the entire drill bit, thereby reducing the service life of the drill bit.

[0004] In the patent document with the announcement number CN220050153U, an internally cooled stepped composite drill is disclosed. Through the auxiliary mechanism arranged inside each group of diversion holes, the drill can utilize the internal retaining cylinder, built-in ball, first magnetic block, connecting rod, second magnetic block, ring and fixed rod to not hinder the coolant impacted by the internal cooling channel from flowing inside the diversion hole, while playing a good protective effect on the coolant outlet position in the diversion hole, thereby preventing the waste chips from the chip groove from clogging the diversion hole.

[0005] However, when the internally cooled stepped composite drill is in use, the coolant is prone to backflow after use, and the backflowing coolant may be accompanied by some debris, causing blockage of the cooling pipe. Therefore, it is necessary to propose a stepped internally cooled drill. Utility Model Content

[0006] The purpose of the present utility model is to provide a stepped internal cooling drill bit to solve the internal cooling problem of the stepped drill bit proposed in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a stepped internal coolant drill bit, comprising a connecting rod and a spiral head fixedly connected to one side of the connecting rod, wherein an anti-backflow mechanism is provided inside the connecting rod, and an internal coolant mechanism is provided inside the spiral head;

[0008] The anti-backflow mechanism includes a connecting pipe, a limit block, an annular sealing belt, a sealing ball, a mounting plate, a stop block and a spring. The mounting plate is fixedly connected to one side of the connecting rod, the connecting pipe is arranged inside the mounting plate, the limit block is fixedly connected to the inside of the mounting plate, the annular sealing belt is arranged on one side of the limit block, the sealing ball is arranged inside the limit block, the stop block is movably connected to the inner wall of the limit block, and the spring is movably connected to one side of the stop block.

[0009] Preferably, a cavity is provided inside the limit block, and the cavity is divided into two parts, which are respectively provided in cylindrical shapes with different diameters. The cylindrical cavities with different diameters can limit the stop block and the spring.

[0010] Preferably, a sealing ball is provided on one side of the stopper and a spring is provided on the other side. A circular groove with a diameter smaller than that of the sealing ball is opened on one side of the stopper to limit the sealing ball, and the stopper is also provided with a through groove for the coolant to flow out.

[0011] Preferably, a circular groove with a diameter smaller than that of the sealing ball is formed through one side of the annular sealing belt to limit the sealing ball and seal the limit block.

[0012] Preferably, the internal cooling mechanism includes a spiral pipe 1, a spiral pipe 2 and a chip removal groove, the spiral pipe 1 and the spiral pipe 2 are arranged inside the spiral head, and the chip removal groove is opened on the outer surface of the spiral head.

[0013] Preferably, both ends of the connecting pipe are connected to the spiral pipe 1 and the spiral pipe 2 respectively, and the coolant can flow out through the spiral pipe 1 and the spiral pipe 2 after flowing into the connecting pipe.

[0014] Preferably, the spiral pipe 1 and the spiral pipe 2 are arranged in a spiral state without interfering with each other. The spiral pipes can allow the heat generated on the outer surface of the connecting rod to be taken away by the coolant as much as possible.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The stepped internal cooling drill bit can pass the coolant through the spiral pipe 1 and the spiral pipe 2 through the entire drill bit through the internal cooling mechanism, so that the heat generated during operation can be quickly discharged through the coolant, and the chip discharge groove is conducive to the discharge of waste chips during the drilling process, thereby achieving the overall drill bit coolant and debris discharge effect.

[0017] 2. The drill bit with stepped internal cooling has an anti-backflow mechanism. When the coolant passes through the internal cavity of the limit block, the coolant overcomes the rebound force of the spring and presses the sealing ball downward, so that the coolant can flow into the interior of the limit block and be transmitted to the spiral pipe through the connecting pipe. When the coolant hydraulic pressure decreases, the spring will generate a rebound force after compression, so that the sealing ball will block one side of the annular sealing belt again, avoiding the backflow of the coolant and preventing the backflow of the coolant accompanied by some debris, causing the spiral pipe to be blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the spiral head structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the connecting rod structure of the utility model;

[0022] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0023] In the figure: 1. Connecting rod; 2. Spiral head; 101. Connecting pipe; 102. Limit block; 103. Annular sealing belt; 104. Sealing ball; 105. Mounting plate; 106. Stop block; 107. Spring; 201. Spiral pipe 1; 202. Spiral pipe 2; 203. Chip groove. DETAILED DESCRIPTION

[0024] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 5 , the utility model provides a technical solution:

[0026] Example 1:

[0027] A stepped internal coolant drill bit comprises a connecting rod 1 and a spiral head 2 fixedly connected to one side of the connecting rod 1, wherein an anti-backflow mechanism is provided inside the connecting rod 1;

[0028] The backflow prevention mechanism includes a connecting pipe 101, a stopper 102, an annular sealing strip 103, a sealing ball 104, a mounting plate 105, a stopper 106, and a spring 107. The mounting plate 105 is fixedly connected to one side of the connecting rod 1. The connecting pipe 101 is disposed inside the mounting plate 105. The stopper 102 is fixedly connected to the mounting plate 105. A cavity is disposed inside the stopper 102. The cavity is divided into two parts, each of which is configured as a cylindrical shape with different diameters. The cylindrical cavities of different diameters can limit the position of the stopper 106 and the spring 107. The annular sealing strip 103 is disposed on one side of the stopper 102. A circular groove with a diameter smaller than that of the sealing ball 104 is formed through one side of the annular sealing strip 103 to limit the sealing ball 104 and seal the stopper 102. Sealing ball 104 is positioned within stop block 102, while stop block 106 is movably connected to the inner wall of stop block 102. Stop block 106 is provided with sealing ball 104 on one side and spring 107 on the other. Stop block 106 has a circular groove with a diameter smaller than that of sealing ball 104 to limit the position of sealing ball 104. Stop block 106 also has a through groove for coolant to flow out. Spring 107 is movably connected to one side of stop block 106. When coolant passes through the internal cavity of stop block 102, the coolant overcomes the rebound force of spring 107, pushing sealing ball 104 downward, allowing the coolant to flow into stop block 102 and be transmitted to the spiral pipe through connecting pipe 101. When the coolant hydraulic pressure decreases, spring 107 generates a rebound force after compression, causing sealing ball 104 to block one side of annular sealing band 103 again, preventing coolant backflow and preventing the backflow of coolant accompanied by some debris, which could clog the spiral pipe.

[0029] Example 2:

[0030] On the basis of Example 1, an internal cooling mechanism is provided inside the spiral head 2, and the internal cooling mechanism includes a spiral pipe 1 201, a spiral pipe 2 202 and a chip groove 203. The spiral pipe 1 201 and the spiral pipe 2 202 are provided inside the spiral head 2, and the two ends of the connecting pipe 101 are connected to the spiral pipe 1 201 and the spiral pipe 2 202 respectively. After the coolant flows into the connecting pipe 101, it can flow out through the spiral pipe 1 201 and the spiral pipe 2 202. The chip groove 203 is provided on the outer surface of the spiral head 2. The spiral pipe 1 201 and the spiral pipe 2 202 are set in a spiral state that does not interfere with each other. The pipes in the spiral state can allow the heat generated on the outer surface of the connecting rod 1 to be taken away by the coolant as much as possible. The coolant is passed through the entire interior of the drill bit by the spiral pipe 1 201 and the spiral pipe 2 202, so that the heat generated can be quickly discharged through the coolant during operation, and the chip groove 203 is conducive to the discharge of waste chips during the drilling process.

[0031] Working principle:

[0032] First, through the internal cooling mechanism, the coolant can be passed through the entire drill bit through spiral pipe 1 201 and spiral pipe 2 202, so that the heat generated during operation can be quickly discharged through the coolant, and the chip groove 203 is conducive to the discharge of waste chips during the drill bit processing, thereby achieving the overall drill bit cooling liquid and debris discharge effect.

[0033] Furthermore, by means of the anti-backflow mechanism, when the coolant passes through the internal cavity of the limit block 102, the coolant overcomes the rebound force of the spring 107 and presses the sealing ball 104 downward, so that the coolant can flow into the interior of the limit block 102 and be transmitted to the spiral pipe through the connecting pipe 101. When the coolant hydraulic pressure decreases, the spring 107 will generate a rebound force after compression, so that the sealing ball 104 will block one side of the annular sealing belt 103 again, avoiding the backflow of the coolant, and at the same time preventing the backflow of the coolant accompanied by some debris, causing the spiral pipe to be blocked.

[0034] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

Claims

1. A stepped internal coolant drill bit, comprising a connecting rod (1) and a screw head (2) fixedly connected to one side of the connecting rod (1), characterized in that: The connecting rod (1) is provided with an anti-backflow mechanism inside, and the spiral head (2) is provided with an internal cooling mechanism inside; The backflow prevention mechanism comprises a connecting pipe (101), a limiting block (102), an annular sealing belt (103), a sealing ball (104), a mounting plate (105), a stopper (106) and a spring (107); the mounting plate (105) is fixedly connected to one side of the connecting rod (1); the connecting pipe (101) is arranged inside the mounting plate (105); the limiting block (102) is fixedly connected inside the mounting plate (105); the annular sealing belt (103) is arranged on one side of the limiting block (102); the sealing ball (104) is arranged inside the limiting block (102); the stopper (106) is movably connected to the inner wall of the limiting block (102); and the spring (107) is movably connected to one side of the stopper (106).

2. The stepped internal coolant drill bit according to claim 1, characterized in that: A cavity is provided inside the limiting block (102), and the cavity is divided into two parts, each of which is provided in a cylindrical shape with a different diameter.

3. The stepped internal coolant drill bit according to claim 1, characterized in that: A sealing ball (104) is provided on one side of the stopper (106), and a spring (107) is provided on the other side.

4. The stepped internal coolant drill bit according to claim 1, characterized in that: A circular groove having a diameter smaller than that of the sealing ball (104) is formed through one side of the annular sealing belt (103).

5. The stepped internal coolant drill bit according to claim 1, characterized in that: The internal cooling mechanism comprises a spiral pipe 1 (201), a spiral pipe 2 (202) and a chip removal groove (203); the spiral pipe 1 (201) and the spiral pipe 2 (202) are arranged inside the spiral head (2); and the chip removal groove (203) is opened on the outer surface of the spiral head (2).

6. The stepped internal coolant drill bit according to claim 5, characterized in that: The two ends of the connecting pipe (101) are respectively connected to the spiral pipe 1 (201) and the spiral pipe 2 (202).

7. The stepped internal coolant drill according to claim 5, characterized in that: The spiral pipe 1 (201) and the spiral pipe 2 (202) are arranged in a spiral state without interfering with each other.

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