Expanding drill bit

Abstract

The utility model discloses an expanding drill bit, which relates to the technical field of building construction foundation piles and comprises an expanding device mounted on a core tube. Part of the expanding device can obliquely extend to the outer side of the core tube; the expanding device rotates along with the drill bit, and the bottom end of the expanding device rotates to the part outside the outer diameter range of the spiral blade I and simultaneously cuts a hole wall rock-soil body so as to realize expanding; the expanding device is provided with an oil cylinder, a shaft II, a yoke plate, a shaft III, a hollow connecting rod, a locking pin, a shaft IV and an expanding body; according to the expanding drill bit, the displacement sensor is arranged on the oil cylinder, the expanding size is monitored and determined in real time, the stability of the expanding amount of a construction pile type is guaranteed, and digital construction is achieved; the oil cylinder of the expanding device in the expanding drill bit is arranged in the closed cavity of the drill bit, so that the service life is long; the expanding drill bit can be used for cast-in-place pile construction of re-compaction concrete, and compaction of pile subsoil is achieved; the expanding body in the expanding drill bit can be screwed out of various sizes, pile types of pile sections with different expanding diameters can be formed, and optimization design is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to building construction foundation pile technical field especially relates to a reamer. BACKGROUND

[0002] In the construction pile foundation construction, the reamer for variable diameter cast-in-place pile has many kinds, most of which adopt cylinder control to realize the reaming size of pile diameter, the actual reaming amount of the drill bit is calculated according to the theoretical reaming value, and the construction operator realizes the maximum value of reaming by controlling the rated oil supply pressure of the cylinder, and most of them are a reaming amount. Due to the influence of reaming cylinder thrust, rock hardness and compactness, the reaming in high hardness and high compactness rock soil, the reaming cylinder thrust is large, the larger the reaming amount, the larger the required cylinder thrust. Therefore, it is unreliable to consider that the reaming amount reaches the maximum value only by the rated pressure of the reaming cylinder, which results in insufficient bearing capacity of the formed pile, and the construction progress is affected, and the cost of pile foundation is increased.

[0003] Therefore, it is urgent to design a reamer with a reaming amount detection device, which can accurately control the reaming amount of the drill bit, construct multiple reaming amount pile sections in one pile, realize optimized design, improve the bearing capacity of the pile, and reduce the cost of the pile to solve the problems in the above technical field. SUMMARY

[0004] The utility model aims at providing a reamer with optimized structure, accurate control of drill bit reaming amount, construction of multiple reaming amount pile sections in one pile, and improved pile bearing capacity.

[0005] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0006] A reamer, comprising a joint, a core pipe, a spiral blade I, a spiral blade II, a drill tip assembly, a cutting tooth, a concrete pouring pipe and a shaft I, the joint is coaxial with the core pipe and is fixedly connected, the spiral blade I is spirally wound on the outer surface of the upper part of the joint and the core pipe, the spiral blade II is spirally wound on the outer surface of the lower part of the core pipe, the bottom end of the spiral blade II is provided with a cutting tooth, the inner cavity of the core pipe is coaxially provided with the concrete pouring pipe, the upper end of the concrete pouring pipe is communicated with the lower end of the joint, and the lower end of the concrete pouring pipe is communicated with the bottom end of the core pipe to form a channel for concrete, the lower end of the core pipe is provided with two groups of ear seats I arranged in a straight line and symmetrically, the upper two ends of the drill tip assembly are arranged in the two groups of ear seats I, the upper one end of the drill tip assembly is hinged with a group of ear seats I through the shaft I, and the channel opening of the concrete pouring is closed or opened by rotating the drill tip assembly around the shaft I, further comprising:

[0007] A reaming device is installed on the core pipe.

[0008] Part of the diameter expansion device can be inclined to extend outside the core pipe;

[0009] The diameter expansion device follows the rotation of the drill bit and its bottom end rotates to the part outside the outer diameter range of the spiral blade I while cutting the hole wall rock to achieve diameter expansion.

[0010] Further, the diameter expansion device comprises:

[0011] Oil cylinder, shaft II, connecting plate, shaft III, hollow connecting rod, locking pin, shaft IV, diameter expansion body;

[0012] The oil cylinder is installed in the cavity between the core pipe and the concrete pouring pipe and located in the upper middle part of the core pipe;

[0013] The extended end of the oil cylinder is hinged with the upper end of the connecting plate through shaft II;

[0014] The lower end of the connecting plate is hinged with one end of the hollow connecting rod through shaft III;

[0015] The other end of the hollow connecting rod is connected and fixed with the diameter expansion body through the locking pin;

[0016] The lower part of the core pipe is provided with an opening through which the diameter expansion body passes and a pair of ear seats II are arranged on both sides above the opening;

[0017] The upper end of the diameter expansion body is hinged with the ear seat II through shaft IV;

[0018] The oil cylinder drives the diameter expansion body to rotate along shaft IV through the connecting plate and the hollow connecting rod;

[0019] The diameter expansion body rotates counterclockwise along shaft IV to the outside of the bottom end located outside the outer diameter range of the spiral blade I;

[0020] The diameter expansion body rotates clockwise along shaft IV to the outside of the bottom end located within the outer diameter range of the spiral blade I.

[0021] Further, the oil cylinder comprises:

[0022] Cylinder end plug, cylinder body, cylinder end sleeve, joint, cylinder rod, piston and displacement sensor;

[0023] The cylinder end plug is sealingly installed at one end of the cylinder body;

[0024] The cylinder end sleeve is sealingly installed on the inner periphery of the other end of the cylinder body;

[0025] The joint is installed at one end of the cylinder rod and hinged with the connecting plate through shaft II;

[0026] The displacement sensor is sealingly fixed on the cylinder end plug;

[0027] The magnetic ring of the displacement sensor is fixed in the inner hole at one end of the piston;

[0028] The other end of the piston is sealed and coaxially fixed with the cylinder rod;

[0029] The center of the piston and part of the cylinder rod is provided with a mounting hole in communication;

[0030] The measuring rod of the displacement sensor is arranged in the mounting hole.

[0031] Further, a bidirectional hydraulic lock is arranged at the oil inlet and outlet of the oil cylinder to lock the piston at a corresponding position.

[0032] Further, the opening inclination angle of the drill tip assembly is ≤45°.

[0033] In the above technical solution, the diameter expanding drill bit has the following beneficial effects:

[0034] 1. The diameter expanding drill bit can monitor and determine the diameter expansion size at any time by arranging the displacement sensor on the oil cylinder, thereby ensuring the stability of the diameter expansion amount of the construction pile type and realizing digital construction.

[0035] 2. The oil cylinder of the diameter expanding device in the diameter expanding drill bit is arranged in the sealed cavity of the drill bit, thereby prolonging the service life.

[0036] 3. The maximum opening inclination angle of the drill tip assembly in the diameter expanding drill bit is ≤45°, which can be used for the construction of the cast-in-place pile of the compacted concrete, thereby realizing the compaction of the pile bottom soil.

[0037] 4. The diameter expanding body in the diameter expanding drill bit can be rotated out in multiple sizes, thereby forming a pile type of different diameter expanding diameter pile sections and facilitating the optimization design. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0039] Figure 1 A front view of a diameter expanding drill bit provided by the embodiment of the present application;

[0040] Figure 2 A left view of a diameter expanding drill bit provided by the embodiment of the present application (diameter expanding body retracted state);

[0041] Figure 3 A left view of a diameter expanding drill bit provided by the embodiment of the present application (diameter expanding body rotated out state);

[0042] Figure 4The utility model provides a kind of structure schematic diagram of oil cylinder in expanding drill bit (cylinder rod retraction state) for the utility model embodiment provides.

[0043] Figure 5 The utility model provides a kind of structure schematic diagram of oil cylinder of expanding drill bit for the utility model embodiment provides (cylinder rod extension state).

[0044] Figure 6 The utility model provides a kind of structure schematic diagram of expanding drill bit for the utility model embodiment provides (drill tip assembly open state).

[0045] Figure 7 The utility model provides a kind of front view of hollow connecting rod in expanding drill bit for the utility model embodiment provides.

[0046] Figure 8 The utility model provides a kind of front view of expanding body in expanding drill bit for the utility model embodiment provides.

[0047] Mark explanation:

[0048] 1, joint;2, core pipe;3, spiral blade I;4, spiral blade II;5, drill tip assembly;6, cutting tooth;7, concrete pouring pipe;8, shaft I;9, expanding device;

[0049] 21, ear seat I;22, ear seat II;

[0050] 91, oil cylinder;92, shaft II;93, connecting plate;94, shaft III;95, hollow connecting rod;96, locking pin;97, shaft IV;98, expanding body;

[0051] 911, cylinder end plug;912, cylinder body;913, cylinder end sleeve;914, joint;915, cylinder rod;916, piston;917, displacement sensor;918, mounting hole;

[0052] 9171, magnetic ring;9172, measuring rod. Specific embodiment

[0053] In order to make the technical personnel of the prior art better understand the technical scheme of the utility model, the utility model will be further introduced in detail in conjunction with the drawings below.

[0054] It should be noted that the terms "upper end", "lower end", "upper part", "lower part", "upper", "two sides", "outer side", "one end", "the other end" and the like used herein indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description. Similar expressions are only for the purpose of illustration, and are not indicative or suggestive of the device or element referred to having a specific orientation, being constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "I", "II", "III", "IV" and the like are only for the purpose of description, and cannot be understood as indicative or suggestive of relative importance.

[0055] Referring to Figures 1-8 as shown in the drawings;

[0056] A reamer bit, comprising a joint 1, a core pipe 2, a spiral blade I 3, a spiral blade II 4, a drill tip assembly 5, a cutting tooth 6, a concrete pouring pipe 7 and a shaft I 8, the joint 1 is coaxial with the core pipe 2 and fixedly connected, the spiral blade I 3 is spirally wound on the outer surface of the upper part of the joint 1 and the core pipe 2, the spiral blade II 4 is spirally wound on the outer surface of the lower part of the core pipe 2, the bottom end of the spiral blade II 4 is provided with the cutting tooth 6, the inner cavity of the core pipe 2 is coaxially provided with the concrete pouring pipe 7, the upper end of the concrete pouring pipe 7 is communicated with the lower end of the joint 1 and the lower end of the concrete pouring pipe 7 is communicated with the bottom end of the core pipe 2 to form a passage for the concrete to pass through, the lower end of the core pipe 2 is provided with two groups of ear seats I 21 which are arranged in a straight line and symmetrically, the upper two ends of the drill tip assembly 5 are arranged in the two groups of ear seats I 21, one end of the upper side of the drill tip assembly 5 is hinged with one group of ear seats I 21 through the shaft I 8, and the passage for the concrete pouring is closed or opened by rotating the drill tip assembly 5 around the shaft I 8, and the reamer bit further comprises:

[0057] A reaming device 9 is installed on the core pipe 2;

[0058] The reaming device 9 comprises an oil cylinder 91, a shaft II 92, a connecting plate 93, a shaft III 94, a hollow connecting rod 95, a locking pin 96, a shaft IV 97 and a reaming body 98; the oil cylinder 91 is located at the middle upper part of the core pipe 2, the oil cylinder 91 is installed in the cavity between the core pipe 2 and the concrete pouring pipe 7, the extending end of the oil cylinder 91 is hinged with the upper end of the connecting plate 93 through the shaft II 92, the lower end of the connecting plate 93 is hinged with one end of the hollow connecting rod 95 through the shaft III 94, a connecting rod mechanism is formed by the shaft II 92, the connecting plate 93, the shaft III 94 and the hollow connecting rod 95, the other end of the hollow connecting rod 95 is connected and fixed with the reaming body 98 through the locking pin 96, the oil cylinder provides driving force, which is transmitted through the connecting rod mechanism to make the reaming body 98 move;

[0059] Specifically, an opening is formed at the lower part of the core pipe 2, and a pair of ear seats II 22 are arranged on both sides above the opening. The upper end of the expanding body 98 is hinged to the ear seats II 22 through a shaft IV 97. When the expanding body 98 rotates along the shaft IV 97, part of the expanding body 98 can rotate to the outside of the core pipe 2 through the opening. When the outer side of the lower end of the expanding body 98 is located outside the maximum outer diameter of the spiral blade I 3, it can be used for expansion. On this basis, the expanding body 98 forms an inclined angle with the core pipe 2. The larger the angle, the larger the hole diameter. Conversely, the hole diameter becomes smaller. When the hole expansion is completed, the expanding body 98 is driven to rotate in the opposite direction along the shaft IV 97. Part of the expanding body 98 can be gradually withdrawn to the initial state through the opening. The initial state is that the outer side of the lower end of the expanding body 98 is located inside the outer diameter of the spiral blade I 3. At this time, it cannot be used for expansion, and it can be used as a conventional spiral drill bit.

[0060] Further, the oil cylinder 91 includes a cylinder end plug 911, a cylinder body 912, a cylinder end sleeve 913, a joint 914, a cylinder rod 915, a piston 916, and a displacement sensor 917. The cylinder end plug 911, the cylinder body 912, the cylinder end sleeve 913, the cylinder rod 915, and the piston 916 are components of the oil cylinder. The joint 914 is installed at one end of the cylinder rod 915 for connection with the connecting plate 93. The oil cylinder 91 is additionally provided with the displacement sensor 917. The displacement sensor 917 is sealingly fixed on the cylinder end plug 911. A magnetic ring 9171 of the displacement sensor 917 is fixed in the inner hole of one end (the end not connected with the cylinder rod 915) of the piston 916. The other end of the piston 916 is sealingly and coaxially fixed with the cylinder rod 915. The center of the piston 916 and part of the cylinder rod 915 are provided with a communication installation hole 918. A measuring rod 9172 of the displacement sensor 917 is arranged in the installation hole 918. At this time, the magnetic ring 9171 is also distributed on the outer periphery of the measuring rod 9172. When the piston 916 moves, the measuring rod 9172 generates relative displacement. The displacement of the measuring rod 9172 is equal to the extension amount of the cylinder rod 915. The magnetic ring 9171 is used to obtain accurate measurement position.

[0061] Preferably, a bidirectional hydraulic lock is arranged at the oil inlet and outlet of the oil cylinder 91 to ensure reliable locking of the piston 916 at any position in the stroke range, thereby ensuring the stability of the expansion size.

[0062] Preferably, the opening angle β of the drill tip assembly 5 is ≤45°, which can be used for construction of compacted concrete filled piles to realize compaction of pile bottom soil.

[0063] The specific implementation is as follows:

[0064] In the process of expanding the diameter, the oil cylinder 91 supplies oil to the rodless cavity, the piston 916 drives the cylinder rod 915 to extend, the hollow connecting rod 95 drives the lower end of the expanding body 98 to rotate outward around the shaft IV 97, and the lower end of the expanding body 98 cuts the hole wall rock soil on the outside to expand the diameter; after the construction is completed, the oil cylinder 91 supplies oil to the rod cavity, the piston 916 drives the cylinder rod 915 to retract, thereby driving the expanding body 98 to rotate, and the lower end of the retracted expanding body 98 is located on the inside of the outer diameter of the spiral blade I 3;

[0065] In the process of extending the cylinder rod 915 by the piston 916, the measuring rod 9172 of the displacement sensor 917 is relatively displaced from the piston 916, and the displacement amount is equal to the extension amount of the cylinder rod 915; each displacement amount is accurately recorded by the displacement sensor 917 and transmitted to the construction operation panel display screen, and the construction operator can determine the value of the hole diameter according to the stroke of the oil cylinder 91 and the expanding rotation amount table.

[0066] The above only describes some exemplary embodiments of the utility model in a descriptive manner, without doubt, for ordinary skilled in the art, the described embodiments can be modified in various different ways without deviating from the spirit and scope of the utility model. Therefore, the above drawings and description are illustrative in nature and should not be understood as limiting the scope of protection of the utility model claims.

Claims

1. A reamer bit comprising a joint (1), a core tube (2), a helical blade I (3), a helical blade II (4), a drill tip assembly (5), a cutting tooth (6), a concrete pouring pipe (7) and a shaft I (8), the joint (1) is coaxial and fixedly connected with the core tube (2), the helical blade I (3) is spirally wound on the outer surface of the upper part of the joint (1) and the core tube (2), the helical blade II (4) is spirally wound on the outer surface of the lower part of the core tube (2), the bottom end of the helical blade II (4) is provided with the cutting tooth (6), the inner cavity of the core tube (2) is coaxially provided with the concrete pouring pipe (7), the upper end of the concrete pouring pipe (7) is communicated with the lower end of the joint (1) and the lower end of the concrete pouring pipe (7) is communicated with the bottom end of the core tube (2) to form a channel for the concrete to pass through, the lower end of the core tube (2) is provided with two groups of ear seats I (21) which are arranged in a straight line and symmetrically, the upper two ends of the drill tip assembly (5) are arranged in the two groups of ear seats I (21), the upper one end of the drill tip assembly (5) is hinged with one group of ear seats I (21) through the shaft I (8), and the channel opening for the concrete pouring is closed or opened by rotating the drill tip assembly (5) around the shaft I (8), characterized in that, Also include: Diameter expansion device (9), the diameter expansion device (9) is installed on the core pipe (2); Part of the diameter expansion device (9) can be inclined to extend to the outside of the core pipe (2); The diameter expansion device (9) follows the rotation of the drill bit and its bottom end rotates to the part outside the outer diameter range of the spiral blade I (3) and simultaneously cuts the hole wall rock to achieve diameter expansion; The diameter expansion device (9) comprises: Oil cylinder (91), shaft II (92), connecting plate (93), shaft III (94), hollow connecting rod (95), locking pin (96), shaft IV (97), diameter expansion body (98); The oil cylinder (91) is installed in the cavity between the core pipe (2) and the concrete pouring pipe (7) and is located in the middle and upper part of the core pipe (2); The extending end of the oil cylinder (91) is hinged with the upper end of the connecting plate (93) through the shaft II (92); The lower end of the connecting plate (93) is hinged with one end of the hollow connecting rod (95) through the shaft III (94); The other end of the hollow connecting rod (95) is connected and fixed with the diameter expansion body (98) through the locking pin (96); The lower part of the core pipe (2) is provided with an opening through which the diameter expansion body (98) passes and a pair of ear seats II (22) are arranged on both sides above the opening; The upper end of the diameter expansion body (98) is hinged with the ear seat II (22) through the shaft IV (97); The oil cylinder (91) drives the diameter expansion body (98) to rotate along the shaft IV (97) through the connecting plate (93) and the hollow connecting rod (95); The diameter expansion body (98) rotates counterclockwise along the shaft IV (97) to the outside of the bottom end and is located outside the outer diameter range of the spiral blade I (3); The diameter expansion body (98) rotates clockwise along the shaft IV (97) to the outside of the bottom end and is located within the outer diameter range of the spiral blade I (3); The oil cylinder (91) comprises: Cylinder end plug (911), cylinder body (912), cylinder end sleeve (913), joint (914), cylinder rod (915), piston (916) and displacement sensor (917); The cylinder end plug (911) is sealingly installed at one end of the cylinder body (912); The cylinder end sleeve (913) is sealingly installed on the inner periphery of the other end of the cylinder body (912); The joint (914) is installed at one end of the cylinder rod (915) and is hinged with the connecting plate (93) through the shaft II (92); The displacement sensor (917) is sealingly fixed on the cylinder end plug (911); The magnetic ring (9171) of the displacement sensor (917) is fixed in the inner hole at one end of the piston (916); The other end of the piston (916) is sealingly and coaxially fixed with the cylinder rod (915); The center of the piston (916) and part of the cylinder rod (915) is provided with a communicating installation hole (918); The measuring rod (9172) of the displacement sensor (917) is arranged in the installation hole (918).

2. The diameter expansion drill bit according to claim 1, wherein: A bidirectional hydraulic lock is arranged at the oil inlet and outlet of the oil cylinder (91) to realize the movement of the piston (916) to be locked at the corresponding position.

3. The diameter expansion drill bit according to claim 1, wherein: The opening inclination angle β of the drill tip assembly (5) is ≤45°.

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