Device and method for ensuring uniform wall thickness of stator with equal wall thickness after glue injection

Abstract

This invention belongs to the field of drilling tool technology, specifically relating to a device for ensuring uniform rubber wall thickness after adhesive injection in a stator with equal wall thickness. The device includes inner and outer spiral positioning heads, a connecting rod, a base, a mandrel, an upper plug, a lower plug, an upper baffle, a lower baffle, a positioning bolt, an upper nut, a first nut, and a second nut. The inner and outer spiral positioning heads are connected to the base via the connecting rod. The inner side of each positioning head has an inner spiral that engages with the threaded surface of the mandrel. The upper plug is fitted onto one end of the mandrel, the upper baffle is fitted onto the mandrel and fixed by the upper nut, and the lower plug is fitted onto the other end of the mandrel. The first nut is threadedly connected to the other end of the mandrel and presses against the lower plug. The lower baffle is threadedly connected to the other end of the mandrel and fixed by the second nut. The positioning bolt passes through the side of the stator housing with equal wall thickness. This device ensures uniform rubber wall thickness after adhesive injection in the stator of a screw drilling tool with equal wall thickness, thus improving the service life of the stator.

Description

Technical Field

[0001] This invention belongs to the field of drilling tool technology, and specifically relates to a device and method for ensuring uniform glue injection wall thickness in stators with equal wall thickness. Background Technology

[0002] The equal wall thickness stator is the core component of the equal wall thickness screw drill motor, consisting of an equal wall thickness stator housing and a rubber liner. The two ends of the equal wall thickness stator housing require threaded connections. The internal helical line is not on the end face, while the external helical line of the mandrel fits inside the equal wall thickness stator housing, making visual alignment difficult. During adhesive injection, uneven rubber wall thickness is inevitable, but since the rubber completely covers the inner helical surface of the stator, this situation is difficult to detect after adhesive injection.

[0003] Feedback from field users indicated that the equal-wall-thickness screw drill bit failed within a very short period of use. Upon disassembly, it was found that the adhesive was peeling off. Analysis of the axial section of the failed equal-wall-thickness stator revealed... Figure 6 This situation occurs when the top and bottom of the valleys of the stator housing and mandrel of equal wall thickness are not aligned during glue injection. Summary of the Invention

[0004] The purpose of this invention is to provide a safe, effective, low-cost, easy-to-manufacture roller cone bit that can be used for continuous well cleaning operations over a long period of time.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a device for ensuring uniform wall thickness of a stator with equal wall thickness during glue injection, comprising inner and outer spiral positioning heads, a connecting rod, a base, a mandrel, an upper plug, a lower plug, an upper baffle, a lower baffle, a positioning bolt, an upper nut, a first nut, and a second nut. The inner and outer spiral positioning heads are connected to the base via the connecting rod. The inner side of the inner and outer spiral positioning heads has an inner spiral that engages with the threaded surface of the mandrel. The upper plug is fitted onto one end of the mandrel, the upper baffle is fitted onto the mandrel and fixed by the upper nut, the lower plug is fitted onto the other end of the mandrel, the first nut is threadedly connected to the other end of the mandrel and presses against the lower plug, the lower baffle is threadedly connected to the other end of the mandrel and fixed by the second nut, and the positioning bolt passes through the side of the stator housing with equal wall thickness.

[0006] Preferably, there are multiple positioning bolts, evenly distributed around the stator housing.

[0007] Preferably, the mandrel has a hollow structure in the middle.

[0008] A method for ensuring uniform wall thickness in a stator with equal wall thickness after adhesive injection, comprising the above-mentioned apparatus and the following steps:

[0009] Step 1: After installing the upper plug, upper baffle, and upper nut on the fixed end of the mandrel, insert it into the stator housing with the same wall thickness from one end;

[0010] Step 2: Then, the inner and outer spiral positioning heads are rotated from the other end and inserted into the annulus of the mandrel and the stator housing with the same wall thickness;

[0011] Step 3: Secure the stator housing and mandrel of equal wall thickness using positioning bolts;

[0012] Step 4: Rotate to the right and pull out the inner and outer spiral positioning heads;

[0013] Step 5: Install the lower plug, first nut, lower baffle, and second nut in sequence, then apply adhesive.

[0014] Step 6: Once the glue has set, remove the mandrel and other components.

[0015] Preferably, in step two, the mandrel should be slightly rotated until the top and bottom of the valleys of the helical line of the stator housing with equal wall thickness are completely aligned before the inner and outer helical positioning heads can be installed in place.

[0016] The beneficial effects of this invention are: this device can ensure that the rubber wall thickness of the stator of the screw drill bit with equal wall thickness is uniform after glue injection, thereby improving the service life of the stator. Attached Figure Description

[0017] Figure 1 This is a perspective view of the inner and outer spiral positioning head in this invention;

[0018] Figure 2 This is a schematic diagram of the inner and outer spiral positioning heads being installed inside the stator housing in this invention;

[0019] Figure 3 This is a schematic diagram of the positioning bolt locking mandrel in this invention;

[0020] Figure 4 This is a diagram showing the state of the inner and outer spiral positioning heads being removed in this invention;

[0021] Figure 5 This is a schematic diagram of the adhesive injection structure in this invention;

[0022] Figure 6 Diagram showing the glue injection process of the existing structure;

[0023] Figure 7 This is a diagram showing the dispensing state of the present invention. Detailed Implementation

[0024] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments.

[0025] like Figure 1-5As shown, a device for ensuring uniform wall thickness of a stator with equal wall thickness during glue injection includes an inner and outer spiral positioning head 1, a connecting rod 2, a base 3, a mandrel 4, an upper plug 5, a lower plug 6, an upper baffle 7, a lower baffle 8, a positioning bolt 9, an upper nut 10, a first nut 11, and a second nut 12. The inner and outer spiral positioning heads are connected to the base via the connecting rod. The inner side of the inner and outer spiral positioning heads has an inner spiral 13 that engages with the threaded surface of the mandrel. The inner and outer spiral positioning heads 1, the connecting rod 2, and the base 3 form a tooling. By holding the base with one hand, the inner and outer spiral positioning heads can be rotated, allowing them to spirally enter the mandrel from one end, ensuring that the valley tops and bottoms of the spiral lines of the stator housing and the mandrel are perfectly aligned, thus guaranteeing uniform glue injection.

[0026] The upper plug is fitted onto one end of the mandrel, and the upper baffle is fitted onto the mandrel and secured with the upper nut. First, the upper plug is installed on the mandrel, then the upper baffle is fitted, ensuring it is flush against one end of the stator housing with equal wall thickness, and then secured with the upper nut. The lower plug is fitted onto the other end of the mandrel, and a first nut is threaded onto the other end of the mandrel and presses against the lower plug. The lower baffle is threaded onto the other end of the mandrel and secured with a second nut. In use, the lower plug is installed first, then the first nut is tightened, followed by the upper and lower baffles, which are then tightened with the second nut. To center the mandrel, multiple positioning bolts pass through the side of the stator housing 14 with equal wall thickness, evenly distributed around the stator housing. The mandrel has a hollow structure in the middle for easy installation.

[0027] The inner spiral surface of the internal spiral positioning head is in clearance fit with the outer spiral surface of the mandrel, and the outer spiral surface is in clearance fit with the inner spiral surface of the stator housing. The outer spiral surface also has a portion of a tapered surface, which facilitates guiding and installation.

[0028] The device includes the following steps:

[0029] Step 1: After installing the upper plug, upper baffle, and upper nut on the fixed end of the mandrel, insert it into the stator housing of equal wall thickness from one end. Figure 2 As shown;

[0030] Step 2: Then, rotate the inner and outer spiral positioning heads from the other end and insert them into the annulus of the mandrel and the stator housing with the same wall thickness, as shown below. Figure 3 As shown; this process requires slight rotation of the mandrel until the top and bottom of the valleys of the helical line of the stator housing of equal wall thickness are completely aligned, and then the inner and outer helical positioning heads can be installed in place.

[0031] Step 3: Secure the stator housing and mandrel of equal wall thickness using positioning bolts, such as... Figure 3 As shown;

[0032] Step 4: Rotate to the right and pull out the inner and outer spiral positioning heads, as shown. Figure 4 As shown;

[0033] Step 5: Install the lower plug, first nut, lower baffle, and second nut in sequence, then inject rubber 15. Figure 5 As shown;

[0034] Step Six: After the glue has set, remove the mandrel and other parts. The result is as follows. Figure 7 As shown.

[0035] The inner and outer helical lines of the internal and external helical locating head must be concentric, and the apex and trough of the lines must be perfectly aligned. To achieve this, a round tube is machined on a lathe, with a 1mm machining allowance for both the inner and outer diameters, and sufficient length for clamping and a certain safety margin. The machined tube is then clamped onto the worktable of a five-axis machining center, completing the machining of the inner and outer helical lines in a single setup. This type of internal and external helical tooling can be manufactured using methods such as wire cutting, casting, and 3D printing; regardless of the method used, it falls within the protection scope of this invention.

[0036] This tooling can be assembled by threaded connection, welding, or machined into a single unit. Regardless of the structure, it falls within the protection scope of this invention.

[0037] It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A device for ensuring uniform wall thickness during glue injection in stators of equal wall thickness, characterized in that: The device includes an inner and outer spiral positioning head, a connecting rod, a base, a spindle, an upper plug, a lower plug, an upper baffle, a lower baffle, a positioning bolt, an upper nut, a first nut, and a second nut. The inner and outer spiral positioning heads are connected to the base via the connecting rod. The inner side of the inner and outer spiral positioning heads has an inner spiral that engages with the threaded surface of the spindle. The upper plug is fitted onto one end of the spindle, the upper baffle is fitted onto the spindle and fixed by the upper nut, the lower plug is fitted onto the other end of the spindle, the first nut is threaded onto the other end of the spindle and presses against the lower plug, the lower baffle is threaded onto the other end of the spindle and fixed by the second nut, and the positioning bolt passes through the side of the stator housing with equal wall thickness. The device includes the following steps: Step 1: After installing the upper plug, upper baffle, and upper nut on the fixed end of the mandrel, insert it into the stator housing with equal wall thickness from one end; Step 2: Then, rotate the inner and outer spiral positioning heads from the other end and insert them into the annulus of the mandrel and the stator housing with equal wall thickness. Slightly rotate the mandrel until the top and bottom of the valleys of the spiral lines of the stator housing with equal wall thickness and the mandrel are completely aligned. Only then can the inner and outer spiral positioning heads be installed in place. Step 3: Secure the stator housing and mandrel of equal wall thickness using positioning bolts; Step 4: Rotate to the right and pull out the inner and outer spiral positioning heads; Step 5: Install the lower plug, first nut, lower baffle, and second nut in sequence, then apply adhesive. Step 6: Once the glue has set, remove the mandrel and other components.

2. The device for ensuring uniform wall thickness of stator with equal wall thickness according to claim 1, characterized in that: There are multiple positioning bolts, evenly distributed around the stator housing.

3. The device for ensuring uniform wall thickness of stators with equal wall thickness according to claim 1, characterized in that: The core has a hollow structure in the middle.

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