Square head bolt

Abstract

The utility model discloses a square head bolt, and particularly relates to the technical field of bolts, the square head bolt comprises a screw, the top surface of the screw is fixedly provided with a square head, the middle part of the top surface of the square head is fixedly provided with a stabilizing head, the middle part of the top surface of the stabilizing head is provided with an inner hexagonal groove, and the inner part of the inner hexagonal groove is provided with a linear groove; an expansion cavity is formed in the screw rod, and threads are arranged on the inner wall of the expansion cavity. According to the square-head bolt, in actual work, the miniature bolt is inserted into the expansion cavity and rotates, the driving head can be pushed to descend along with rotation of the miniature bolt, when the driving head descends to make contact with the two miniature wheels, the two miniature wheels, the two movable rods and the two expansion plates can be pushed to move towards the outside of the expansion cavity, and the square-head bolt is driven to rotate. When the square-head bolt is loosened, the expansion plate is matched with the screw hole to abut against the inner wall of the screw hole, friction force is improved, and therefore the anti-loosening performance of the square-head bolt can be effectively improved, and loosening of the square-head bolt is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of bolts, in particular to a square head bolt. Background Art

[0002] The battery mainly includes a battery casing and a battery cell arranged inside the battery. When assembling the battery casing, bolts are used. Bolts are a type of fastener consisting of a head and a screw (a cylinder with external threads) and are used to fasten and connect two parts with through holes.

[0003] The existing bolt structure is relatively simple and has poor anti-loosening performance. After long-term use, it is easy to loosen, which in turn affects the tightness of the battery shell connection. Therefore, in order to solve the above defects, the inventor proposes a square head bolt. Utility Model Content

[0004] To this end, the utility model provides a square head bolt to solve the problem that the bolts in the prior art have poor anti-loosening performance and are prone to loosening after long-term use.

[0005] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0006] A square head bolt comprises a screw rod, a square head fixedly mounted on the top surface of the screw rod, a stabilizing head fixedly mounted in the middle of the top surface of the square head, a hexagonal inner groove formed in the middle of the top surface of the stabilizing head, and a slotted groove formed inside the hexagonal inner groove;

[0007] An expansion chamber is provided inside the screw, and the inner wall of the expansion chamber is provided with a thread. Both sides of the interior of the expansion chamber are slidably connected with movable rods, and part of the two movable rods are located inside the expansion chamber, and the other part of the two movable rods are located outside the expansion chamber. The ends of the two movable rods located inside the expansion chamber are rotatably connected to micro wheels, and the ends of the two movable rods located outside the expansion chamber are fixedly installed with expansion plates, and the internal threads of the expansion chamber are connected to micro bolts.

[0008] Preferably, a movable groove is provided on the bottom surface of the micro bolt, and a movable head is rotatably connected inside the movable groove, a driving head is fixedly mounted on the bottom surface of the movable head, and a cross groove is provided on the top surface of the micro bolt.

[0009] Preferably, the outer surface of the square head is sleeved with a filling ring, and limit blocks are fixedly installed on both sides of the inner wall of the filling ring, and telescopic holes are opened on the other two sides of the inner wall of the filling ring, and springs are fixedly installed on the opposite sides of the two telescopic holes, and fixed heads are fixedly installed on the opposite ends of the two springs, and the two fixed heads are located at one end of the spring and a connecting rod is fixedly installed, and the connecting rod passes through the inside of the spring, and hidden grooves are opened on both sides of the outer surface of the filling ring, and a pull plate is fixedly installed on one end of the two connecting rods extending into the hidden groove.

[0010] Preferably, limiting grooves are provided on both sides of the top surface of the square head, and two fixing holes are provided on the side surface of the square head.

[0011] Preferably, the sizes of the two limiting grooves are respectively the same as the sizes of the two limiting blocks, and the sizes of the two fixing heads are respectively the same as the sizes of the two fixing holes.

[0012] Preferably, a filling groove is provided on the outer surface of the screw on one side of the expansion plate.

[0013] The utility model has the following advantages:

[0014] The utility model discloses a square head bolt:

[0015] 1. By setting a stabilizing head, when the bolt is injection molded into the battery casing, the stabilizing head can ensure its stability and prevent it from tilting easily. The hexagonal slot and the slotted slot are set to facilitate the staff to use different tools to turn the bolt, thereby improving the applicability of the bolt.

[0016] 2. By setting up an expansion cavity, insert the micro bolt into the expansion cavity and rotate it. As the micro bolt rotates, the driving head can be pushed down. When the driving head drops to contact the two micro wheels, it will push the two micro wheels, two movable rods and two expansion plates to move to the outside of the expansion cavity. The expansion plate will cooperate with the screw hole, support the inner wall of the screw hole, increase the friction, thereby effectively improving the anti-loosening performance of the square head bolt, and effectively avoiding the loosening of the square head bolt and affecting the connection tightness of the battery casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0018] The structures, proportions, sizes, etc. disclosed in this specification are intended only to complement the contents disclosed in the specification and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes that do not affect the efficacy and objectives of the present invention shall still fall within the scope of the technical contents disclosed in the present invention.

[0019] Figure 1 This is the overall structural diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the screw of the present utility model;

[0021] Figure 3 This is a schematic diagram of the micro bolt structure of the utility model;

[0022] Figure 4 This is a schematic diagram of the filling ring structure of the utility model;

[0023] Figure 5 This is a schematic diagram of the top view of the stabilizing head of the present invention.

[0024] In the figure: 1. Screw; 2. Filling ring; 3. Stabilizing head; 4. Square head; 101. Expansion chamber; 102. Movable rod; 103. Mini wheel; 104. Expansion plate; 105. Mini bolt; 1051. Driving head; 1052. Movable groove; 1053. Movable head; 1054. Cross groove; 201. Limit block; 202. Telescopic hole; 203. Spring; 204. Fixed head; 205. Connecting rod; 206. Pull plate; 207. Hidden groove; 401. Limit groove; 402. Fixing hole; 301. Hexagonal socket; 302. Slotted slot. DETAILED DESCRIPTION

[0025] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0026] The utility model discloses a square head bolt, such as Figure 1-5 As shown, it includes a screw rod 1 and a square head 4 arranged on the top surface of the screw rod 1. The square head 4 is square, and a stabilizing head 3 is fixedly installed in the middle of the top surface of the square head 4. The square head 4 and the stabilizing head 3 can effectively ensure the stability of the bolt and make it less likely to skew.

[0027] An expansion chamber 101 is provided inside the screw 1, and the inner wall of the expansion chamber 101 is provided with a thread. Both sides of the interior of the expansion chamber 101 are slidably connected with movable rods 102, and part of the two movable rods 102 are located inside the expansion chamber 101, and the other part of the two movable rods 102 are located outside the expansion chamber 101. The movable rods 102 can move inside the expansion chamber 101.

[0028] The two movable rods 102 are rotatably connected to a micro wheel 103 at one end located inside the expansion chamber 101, and the two movable rods 102 are fixedly installed with an expansion plate 104 at one end located outside the expansion chamber 101. When the two movable rods 102 move, the expansion plate 104 will be driven to move. The internal thread of the expansion chamber 101 is connected to a micro bolt 105.

[0029] A filling groove is provided on the outer surface of the screw rod 1 on one side of the expansion plate 104. When the two movable rods 102 are close to each other, the two expansion plates 104 can be driven to insert into the filling groove so that the screw rod 1 can be normally inserted into the screw hole.

[0030] The bottom surface of the micro bolt 105 is provided with a movable groove 1052, and the internal rotation of the movable groove 1052 is connected to the movable head 1053. The bottom surface of the movable head 1053 is fixedly installed with a driving head 1051, and the movable head 1053 can rotate inside the movable groove 1052. The top surface of the micro bolt 105 is provided with a cross groove 1054. The micro bolt 105 is inserted into the expansion cavity 101, so that the micro bolt 105 and the expansion cavity 101 are connected through threads, and then the micro thread is rotated with a cross screwdriver to gradually insert the micro bolt 105 and the movable head 1053 into the expansion cavity 101. When the driving head 1051 drops to contact the two micro wheels 103, it will push the two micro wheels 103 and the two movable rods 102 and the two expansion plates 104 to move to the outside of the expansion cavity 101, and the expansion plate 104 will cooperate with the screw hole to press against the inner wall of the screw hole to increase friction.

[0031] The outer surface of the square head 4 is sleeved with a filling ring 2. By sleeved the filling ring 2 on the outer surface of the square head 4, the area of ​​the square head 4 can be increased, and thus when used for parts with T-slots, it can adapt to T-slots of different sizes.

[0032] Limiting blocks 201 are fixedly installed on both sides of the inner wall of the filling ring 2, and telescopic holes 202 are opened on the other two sides of the inner wall of the filling ring 2. Springs 203 are fixedly installed on the opposite sides of the two telescopic holes 202, and fixed heads 204 are fixedly installed on the opposite ends of the two springs 203. When the fixed heads 204 are retracted into the telescopic holes 202, they will squeeze the springs 203.

[0033] The two fixing heads 204 are both fixedly mounted with a connecting rod 205 at one end of the spring 203 , and the connecting rod 205 passes through the inside of the spring 203 . When the connecting rod 205 is pulled toward the outside of the telescopic hole 202 , the fixing heads 204 can be driven to squeeze the spring 203 .

[0034] Hidden grooves 207 are provided on both sides of the outer surface of the filling ring 2 , and a pull plate 206 is fixedly installed on one end of the two connecting rods 205 extending into the hidden groove 207 .

[0035] Limiting grooves 401 are provided on both sides of the top surface of the square head 4, and two fixing holes 402 are provided on the side of the square head 4. The two connecting rods 205 are pulled toward the outside of the telescopic hole 202 to retract the two fixing heads 204 into the telescopic hole 202, and then the filling ring 2 is sleeved on the outer surface of the square head 4, and the two limiting blocks 201 will be inserted into the limiting grooves 401. After that, the connecting rods 205 are released, and the squeezed springs 203 will push the two fixing heads 204 to be inserted into the fixing holes 402 to connect the filling ring 2 to the square head 4.

[0036] The sizes of the two limiting grooves 401 are respectively the same as the sizes of the two limiting blocks 201 , and the sizes of the two fixing heads 204 are respectively the same as the sizes of the two fixing holes 402 .

[0037] A hexagonal socket 301 is formed in the middle of the top surface of the stabilizing head 3 , and a slotted slot 302 is formed inside the hexagonal socket 301 , so that a worker can use a hexagonal wrench or a slotted bolt driver to turn the bolt.

[0038] The working principle of the present invention is as follows: when the screw rod 1 is inserted into the screw hole, the micro bolt 105 is inserted into the expansion cavity 101 and rotated. As the micro bolt 105 rotates, the driving head 1051 is pushed down. When the driving head 1051 drops to contact the two micro wheels 103, it will push the two micro wheels 103 and the two movable rods 102 and the two expansion plates 104 to move to the outside of the expansion cavity 101. The expansion plates 104 will cooperate with the screw hole, press against the inner wall of the screw hole, and increase friction.

[0039] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.

Claims

1. A square head bolt, comprising a screw rod (1), characterized in that: A square head (4) is fixedly mounted on the top surface of the screw (1), a stabilizing head (3) is fixedly mounted in the middle of the top surface of the square head (4), a hexagonal slot (301) is provided in the middle of the top surface of the stabilizing head (3), and a slot (302) is provided inside the hexagonal slot (301); An expansion chamber (101) is provided inside the screw rod (1), and the inner wall of the expansion chamber (101) is provided with a thread. Both sides of the interior of the expansion chamber (101) are slidably connected with movable rods (102), and a part of the two movable rods (102) is located inside the expansion chamber (101), and the other part of the two movable rods (102) is located outside the expansion chamber (101). One end of the two movable rods (102) located inside the expansion chamber (101) is rotatably connected to a micro wheel (103), and one end of the two movable rods (102) located outside the expansion chamber (101) is fixedly installed with an expansion plate (104), and the internal thread of the expansion chamber (101) is connected to a micro bolt (105).

2. The square head bolt according to claim 1, characterized in that: The bottom surface of the micro bolt (105) is provided with a movable groove (1052), and the inside of the movable groove (1052) is rotatably connected to a movable head (1053), the bottom surface of the movable head (1053) is fixedly mounted with a driving head (1051), and the top surface of the micro bolt (105) is provided with a cross groove (1054).

3. The square head bolt according to claim 1, characterized in that: The outer surface of the square head (4) is sleeved with a filling ring (2), and both sides of the inner wall of the filling ring (2) are fixedly installed with limit blocks (201), and the other two sides of the inner wall of the filling ring (2) are provided with telescopic holes (202), and the opposite sides of the two telescopic holes (202) are fixedly installed with springs (203), and the opposite ends of the two springs (203) are fixedly installed with fixed heads (204), and the two fixed heads (204) are located at one end of the spring (203) and are fixedly installed with connecting rods (205), and the connecting rods (205) pass through the inside of the spring (203), and the outer surface of the filling ring (2) is provided with hidden grooves (207), and the ends of the two connecting rods (205) extending into the hidden grooves (207) are fixedly installed with pull plates (206).

4. The square head bolt according to claim 3, characterized in that: Limiting grooves (401) are provided on both sides of the top surface of the square head (4), and two fixing holes (402) are provided on the side surface of the square head (4).

5. The square head bolt according to claim 4, characterized in that: The sizes of the two limiting grooves (401) are respectively the same as the sizes of the two limiting blocks (201), and the sizes of the two fixing heads (204) are respectively the same as the sizes of the two fixing holes (402).

6. The square head bolt according to claim 1, characterized in that: A filling groove is provided on the outer surface of the screw (1) on one side of the expansion plate (104).

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