CN108973468B - Pen ink bottle for teaching - Google Patents

Abstract

The invention provides a pen ink bottle for teaching, which comprises a bottle bottom supporting mechanism, a pen ink bottle body, a concave lifting sealing body, a pen ink bottle mouth ring, a finger-pressure wiping-free mechanism, a concave ventilation bottle cap, an arc-shaped supporting contraction body, a ventilation cavity, a sealing external thread body and a sealing internal thread ring, wherein the upper surface of the concave lifting sealing body is in a concave shape, and relates to the field of stationery. This pen water-jug for teaching can reduce and avoid the body to suffer the pollution of pen water even, also can avoid the pen water to be infected with on people's the hand and the clothing, thereby can recycle, avoid causing the waste, and application method is simple, reduce subsequent process of cleaning, thereby the effectual present pen water-jug structure of having solved is too simple, the pen water is infected with easily at the desktop, each position such as finger and clothing, bring a lot of troubles for the user, and after repetitious usage, the body can be infected with very thick pigment, most people all can directly throw away, cause extravagant problem.

Description

A pen and water bottle for teaching

technical field

The invention relates to the technical field of stationery, in particular to a pen and water bottle for teaching.

Background technique

A lot of teaching aids will be used in teaching activities, among which the more common ones are pen water. Most of the pen water is stored in a small glass bottle. The structure of the small bottle is relatively simple. There will be a lot of traces of pen water on the flat body. Because the bottle is cheap, and bottled pen water can be purchased, people will directly throw the bottle away, causing unnecessary waste;

However, an important reason why the water of the pen will affect the use is that when people use the pen to absorb water, the pen barrel of the pen is easy to get a lot of pen water. The next time you use it, you have to unscrew the cap with your hands. You need to support the bottle body with your hands. It is easy to stick the color of the pen water on your hands, and it will stain your clothes if you are not careful. In addition, the bottle cap of the pen water will directly touch the bottle body. The pen water inside, the pen water on the bottle cap is easy to stick to the hand when unscrewed, so the current pen water bottle structure is too simple, and the pen water is easy to be stained on the desktop, fingers and clothing and other parts, giving the user It brings a lot of trouble, and after many uses, the bottle body will be stained with thick paint, and most people will directly throw it away, causing waste, so a teaching pen and water bottle is needed.

SUMMARY OF THE INVENTION

(1) Technical problems solved

In view of the shortcomings of the prior art, the present invention provides a pen and water bottle for teaching, which solves the problem that the structure of the current pen and water bottle is too simple, and the pen water is easily stained on various parts such as the desktop, fingers and clothes, which brings a lot of It is troublesome, and after many uses, the bottle body will be stained with thick paint, and most people will directly throw it away, causing waste.

(2) Technical solutions

In order to achieve the above purpose, the present invention is achieved through the following technical solutions: a pen and water bottle for teaching, comprising a bottle bottom holding mechanism, a pen and water bottle body, a concave lifting sealing body, a pen and water bottle mouth ring, and a finger-pressure-free wiping mechanism , a concave vent bottle cap, an arc-shaped support shrink body, a vent cavity, a sealing outer thread body and a sealing inner thread ring, the upper surface of the concave lifting sealing body is in a concave shape, and the surface of the concave lifting sealing body is sleeved with Sealing sleeve, the surface of the sealing sleeve is slidably connected with the inner wall of the bottle body of the pen and water bottle, the bottom lifting mechanism is located at the bottom of the bottle body of the pen water bottle, and the inner wall of the concave ventilation bottle cap is bonded to the surface of the arc-shaped support constriction body. The inner wall of the vent bottle cap is provided with an inner thread, the surface of the mouth ring of the pen and water bottle is bonded with the surface of the bottle body of the pen and water bottle, the material of the mouth ring of the pen and water bottle includes wood, and the outer surface of the mouth ring of the pen and water bottle is provided with an outer thread, The inner wall of the concave vent bottle cap is threadedly connected with the outer surface of the bottle mouth ring of the pen and water bottle, and the end of the arc-shaped support shrinking body away from the concave vent bottle cap is bonded to the upper surface of the sealing external thread body, and the surface of the sealing external thread body is set There are external threads, the outer surface of the sealing inner thread ring is bonded with the inner wall of the bottle mouth of the pen and water bottle, the inner wall of the sealing inner thread ring is provided with an inner thread, and the inner wall of the sealing inner thread ring is threaded with the surface of the sealing outer thread body. The surface of the arc-shaped support shrink body is arc-shaped, and a ventilation cavity is arranged between the surface of the arc-shaped support shrink body, the inner wall of the bottle mouth ring of the pen and water bottle, the sealing inner thread ring and the inner wall of the concave ventilation bottle cap.

Preferably, the surface of the concave vent cap is provided with a vent, the vent is located above the vent cavity and the vent cavity is communicated with the surface of the concave vent cap.

Preferably, the bottle bottom lifting mechanism includes a trapezoidal leak-trap chassis and a through hole, the inner wall of the trapezoid leak-trap chassis is trapezoidal, and a plurality of support blocks are welded on the surface of the trapezoid leak-trap chassis, and the surface of the support block is connected to the pen and water bottle. The lower surface of the body overlaps.

Preferably, a telescopic tube is welded at the center of the inner wall of the trapezoidal leak-tight chassis, the through hole is opened at the center of the lower surface of the pen and water bottle, the inner wall of the through hole is bonded with a sealing thread ring, and the inner wall of the telescopic tube is slidably connected with a A threaded rod, the surface of the threaded rod is threadedly connected with the inner wall of the sealing threaded ring, the lower surface of the concave lifting sealing body is provided with a bearing, and the inner ring of the bearing is welded with the surface of the threaded rod.

Preferably, the inner wall of the telescopic tube is provided with an annular groove, the inner wall of the annular groove is slidably connected with a clamping block, the inner wall of the telescopic tube is provided with a clamping groove, and the clamping groove is located at the bottom of the annular groove and communicates with the annular groove.

Preferably, the acupressure-free wiping mechanism includes a squeeze chute and an elastic groove, the squeeze chute is provided on the surface of the bottle mouth ring of the pen and water bottle, the number of the squeeze chute is two, and the two squeeze chute The center line of the surface of the bottle mouth ring of the pen and water bottle is a symmetrical line and is symmetrically distributed. The elastic groove is opened on the inner wall of the bottle mouth ring of the pen and water bottle. above.

Preferably, an extrusion rod is slidably connected to the inner wall of the extrusion chute, and one end of the extrusion rod extends to the inside of the mouth ring of the pen and water bottle. The limit block is slidably connected, the surface of the limit block is slidably connected with the inner wall of the limit groove, the surface of the limit block is bonded with the surface of the extrusion rod, and the end of the extrusion rod located inside the bottle mouth ring of the pen and water bottle is bonded with water absorption Cotton, one end of the extrusion rod located outside the mouth ring of the pen and water bottle is provided with a finger pressure groove, and one end of the extrusion rod located outside the bottle mouth ring of the pen and water bottle is bonded with an elastic block, and the surface of the elastic block is inserted with an elastic piece, and the elastic piece is far away from the elastic piece. One end of the block is inserted into the outer surface of the mouth ring of the pen and water bottle.

Preferably, the inner wall of the elastic groove is slidably connected with a slider, the surface of the slider is welded with the flexible extruding iron sheet, the surface of the flexible extruding iron sheet is arc-shaped, and the flexible extruding iron sheet is located directly above the water-absorbing cotton, A spring is inserted into the inner wall of the elastic groove, and one end of the spring is welded with the surface of the slider.

(3) Beneficial effects

(1) When the present invention is in use, the concave vent cap is rotated, the concave vent cap drives the arc-shaped support shrink body to rotate, the arc-shaped support shrink body drives the sealing outer thread body to rotate, and the sealing outer thread body and the sealing inner thread rotate. The ring is separated, and the arc-shaped support shrink body and the sealing external thread body are taken out from the inside of the mouth ring of the pen and water bottle through the concave ventilation bottle cap, and then the pen is inserted into the bottle body of the pen and water bottle to absorb water. When taking it out, use your fingers Squeeze the squeeze rod through the finger pressure groove, squeeze the absorbent cotton with the squeeze rod, and wrap the pen barrel of the pen with two absorbent cottons, and then pull the pen barrel upwards. , reduce waste and pollution, on the other hand, it can also avoid pen water dripping from the pen barrel to the bottle and the table.

(2) In the present invention, by setting the sealing outer thread body and the sealing inner thread ring, the bottle mouth sealing of the pen water bottle is carried out inside the bottle mouth ring of the pen water bottle. No matter how the bottle swings, the pen water will not be contaminated during the sealing process. On the bottle cap, it will not contaminate the bottle body when opening and sealing.

(3) In the present invention, a flexible extruding iron sheet is provided. After the water absorption process is completed, when the bottle cap needs to be covered, the arc-shaped supporting shrink body squeezes the sealing external thread body, and the sealing external thread body pushes the flexible extruding iron Sheet, the flexible extruding iron sheet will drop, and then the inner wall of the flexible extruding iron sheet will contact and squeeze the water-absorbing cotton, and the water from the water-absorbing cotton will be squeezed and dropped into the inside of the pen and water bottle, and then the bottle mouth will be sealed. Then, the absorbent cotton will be exposed inside the ventilation cavity. Since the ventilation cavity is connected to the outside through the ventilation port g, the drying of the absorbent cotton can be accelerated, and the water absorption effect of the absorbent cotton in the next use will not be affected.

(4) In the present invention, the concave lifting sealing body is arranged, the telescopic tube is slid downward, the clamping block is inserted into the interior of the clamping slot, and then the trapezoidal leakage chassis is rotated, and the trapezoidal leakage chassis drives the telescopic tube to rotate, and the telescopic tube is driven by the clamping block. The threaded rod rotates, and the threaded rod pushes the concave lifting sealing body to rise inside the pen and water bottle body. First, the liquid level of the pen water can be raised, which is convenient for water absorption. Second, the contact area between the pen water and the air can be reduced. The volatilization of water, the third aspect, the concave shape of the concave lift sealing body can concentrate the pen water, easy to absorb.

(5) In the present invention, by setting the trapezoidal leakage chassis, even if there is fountain pen water falling on the bottle body, the fountain pen water will flow into the trapezoidal leakage chassis along the bottle body, so as to avoid contamination on the table and cause the situation of polluting the desktop. occur.

(6) The present invention can reduce or even prevent the bottle body from being polluted by the fountain pen water, and can also prevent the fountain pen water from contaminating people's hands and clothes, so that it can be used repeatedly, avoiding waste, and the method of use is simple, reducing the subsequent use of water. The wiping process effectively solves the problem that the structure of the current pen water bottle is too simple, and the pen water is easily stained on various parts such as the desktop, fingers and clothing, which brings a lot of trouble to the user, and the bottle body will be contaminated after repeated use. Very thick paint, most people just throw it away, causing waste problems.

Description of drawings

Fig. 1 is the structural representation of the present invention;

2 is an enlarged view of the acupressure-free wiping mechanism of the present invention;

Fig. 3 is the sectional view of the bottle bottom holding mechanism of the present invention;

FIG. 4 is a cross-sectional view of the slot structure of the present invention.

Among them, 1 bottle bottom holding mechanism, 101 trapezoidal leakage chassis, 102 through hole, a support block, 103 telescopic tube, 104 sealing threaded ring, 105 threaded rod, 106 annular groove, b clamping block, c clamping groove, 2 pens Water bottle body, 3 concave lift sealing body, d sealing sleeve, 4 pen water bottle mouth ring, 5 finger pressure-free wipe mechanism, 501 squeeze chute, 502 elastic groove, 503 squeeze rod, e absorbent cotton, 504 finger Pressure groove, 505 elastic block, 506 shrapnel, 507 slider, f flexible extruded iron sheet, 508 spring, 6 concave vent cap, g vent, 7 arc support constriction, 8 vent cavity, 9 sealed external thread body, 10 sealing female threaded ring.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figures 1-4, an embodiment of the present invention provides a pen and water bottle for teaching, including a bottom holding mechanism 1, a pen and water bottle body 2, a concave lift sealing body 3, a pen and water bottle mouth ring 4, a finger pressure Wipe-free mechanism 5, concave vent bottle cap 6, arc-shaped support constriction 7, vent cavity 8, sealing external thread body 9 and sealing inner thread ring 10, the upper surface of the concave lift sealing body 3 is concave shape, concave shape The surface of the lifting sealing body 3 is sleeved with a sealing sleeve d, the surface of the sealing sleeve d is slidably connected with the inner wall of the pen and water bottle body 2, the bottle bottom holding mechanism 1 is located at the bottom of the pen and water bottle body 2, and the concave ventilation bottle cap 6 The inner wall is bonded with the surface of the arc-shaped support constriction 7, the inner wall of the concave vent cap 6 is provided with internal threads, the surface of the pen and water bottle mouth ring 4 is bonded with the surface of the pen and water bottle body 2, and the pen and water bottle mouth The material of the ring 4 includes wood, the outer surface of the pen and water bottle mouth ring 4 is provided with external threads, the inner wall of the concave vent cap 6 is threadedly connected to the outer surface of the pen and water bottle mouth ring 4, and the arc-shaped support constriction 7 is far away from the concave. One end of the air vent cap 6 is bonded with the upper surface of the sealing outer thread body 9, the surface of the sealing outer thread body 9 is provided with an outer thread, the outer surface of the sealing inner thread ring 10 and the inner wall of the bottle mouth position of the pen and water bottle body 2 Adhesion, the inner wall of the sealing inner thread ring 10 is provided with an inner thread, the inner wall of the sealing inner thread ring 10 is threadedly connected with the surface of the sealing outer thread body 9, the surface of the arc-shaped support shrink body 7 is arc-shaped, and the arc-shaped support shrink body A ventilation cavity 8 is provided between the surface of 7, the inner wall of the bottle mouth ring 4 of the pen and water bottle, the sealing inner thread ring 10 and the inner wall of the concave ventilation bottle cap 6, and the surface of the concave ventilation bottle cap 6 is provided with a ventilation port g, which is ventilated. The mouth g is located above the ventilation cavity 8 and communicates the ventilation cavity 8 with the surface of the concave ventilation bottle cap 6. The bottle bottom holding mechanism 1 includes a trapezoidal leakage chassis 101 and a through hole 102. The inner wall of the trapezoidal leakage chassis 101 is a ladder. Shape, the surface of the trapezoidal leakage chassis 101 is welded with a number of support blocks a, the surface of the support block a is overlapped with the lower surface of the pen and water bottle body 2, and the inner wall of the trapezoidal leakage chassis 101 is welded at the center position. The hole 102 is opened at the center of the lower surface of the pen and water bottle body 2, the inner wall of the through hole 102 is bonded with a sealing threaded ring 104, the inner wall of the telescopic tube 103 is slidably connected with a threaded rod 105, and the surface of the threaded rod 105 is connected with the sealing threaded ring 104. The inner wall is threadedly connected, the lower surface of the concave lifting seal body 3 is provided with a bearing, the inner ring of the bearing is welded with the surface of the threaded rod 105, the inner wall of the telescopic tube 103 is provided with an annular groove 106, and the inner wall of the annular groove 106 is slidably connected with a clamp Block b, the inner wall of the telescopic tube 103 is provided with a card slot c, the card slot c is located at the bottom of the annular groove 106 and communicates with the annular groove 106, the finger-pressure-free wiping mechanism 5 includes a squeeze chute 501 and an elastic groove 502, the squeeze slide The groove 501 is opened on the surface of the bottle mouth ring 4 of the pen and water bottle, and the number of the extrusion chutes 501 is two. 502 is opened on the inner wall of the bottle mouth ring 4 of the pen and water bottle, and the elastic groove 5 The number of 02 is two, the two elastic grooves 502 are respectively located directly above the two extrusion chute 501, the inner wall of the extrusion chute 501 is slidably connected with a extrusion rod 503, and one end of the extrusion rod 503 extends to the pen and water bottle. Inside the bottle mouth ring 4, the inner wall of the bottle mouth ring 4 of the pen and water bottle is provided with a limit groove, the inner wall of the limit groove is slidably connected to the limit block, and the surface of the limit block is slidably connected with the inner wall of the limit groove, and the surface of the limit block is slidably connected to the limit block. Adhesion with the surface of the extrusion rod 503, one end of the extrusion rod 503 located inside the ring 4 of the pen and water bottle is bonded with absorbent cotton e, and one end of the extrusion rod 503 located outside the ring 4 of the pen and water bottle is provided with a finger pressure groove 504, one end of the extrusion rod 503 located outside the pen and water bottle mouth ring 4 is bonded with an elastic block 505, the surface of the elastic block 505 is inserted with an elastic piece 506, and the end of the elastic piece 506 away from the elastic block 505 is connected with the end of the pen and water bottle bottle mouth ring 4. The outer surface is plugged, the inner wall of the elastic groove 502 is slidably connected with a slider 507, the surface of the slider 507 is welded with the flexible extruded iron f, the surface of the flexible extruded iron f is arc-shaped, and the flexible extruded iron f is located at Just above the absorbent cotton e, a spring 508 is inserted into the inner wall of the elastic groove 502 , and one end of the spring 508 is welded to the surface of the slider 507 .

When in use, when it is necessary to suck water from a fountain pen, rotate the concave vent cap 6, the concave vent cap 6 drives the arc-shaped support shrink body 7 to rotate, and the arc-shaped support shrink body 7 drives the sealing external thread body 9 to rotate, and the sealing outer body 9 rotates. The threaded body 9 is separated from the sealing inner thread ring 10, and the arc-shaped support constricting body 7 and the sealing outer thread body 9 are taken out from the inside of the pen and water bottle mouth ring 4 through the concave vent cap 6, and then the pen is inserted into the pen and water bottle. The inside of the bottle body 2 absorbs water. When taking it out, use your fingers to squeeze the squeeze rod 503 through the acupressure groove 504. The squeeze rod 503 squeezes the water-absorbing cotton e. The two water-absorbing cottons e wrap the pen barrel of the pen, and then put the pen barrel Pull it up, after the suction is completed, the bottle mouth needs to be sealed, and the arc-shaped support shrink body 7 and the sealing outer thread body 9 are penetrated into the inside of the bottle mouth ring 4 of the pen and water bottle through the concave ventilation bottle cap 6, and the sealing outer thread body 9 is pushed. Squeeze the flexible extruding iron f, the flexible extruding iron f will drop, and then the inner wall of the flexible extruding iron f will contact and squeeze the water-absorbing cotton e, and the water from the fountain e will be squeezed and dropped into the pen and water bottle. Inside the bottle body 2, then rotate the concave vent cap 6, the concave vent cap 6 is threadedly connected to the surface of the bottle mouth ring 4 of the pen and water bottle, and the sealing outer thread body 9 is threadedly connected with the sealing inner thread ring 10. When the water level of the pen reaches the height of the water level, slide the telescopic tube 103 downward, the block b is stuck into the interior of the slot c, and then rotate the trapezoidal leakage chassis 101, the trapezoidal leakage chassis 101 drives the telescopic tube 103 to rotate, and the telescopic tube 103 passes the clip The block b drives the threaded rod 105 to rotate, and the threaded rod 105 pushes the concave lifting sealing body 3 to rise inside the pen and water bottle body 2 , thus completing the use of the entire teaching pen and water bottle.

Claims (4)

1. The utility model provides a pen ink bottle is used in teaching, includes that the bottle end holds up mechanism (1), pen ink bottle (2), spill promotion seal (3), pen ink bottle bottleneck ring (4), finger pressure exempt from to clean mechanism (5), spill bottle lid (6), arc support contract body (7), ventilate chamber (8), sealed external thread body (9) and sealed internal thread ring (10), its characterized in that: the upper surface of the concave lifting sealing body (3) is in a concave shape, a sealing sleeve (d) is sleeved on the surface of the concave lifting sealing body (3), the surface of the sealing sleeve (d) is in sliding connection with the inner wall of the pen water bottle body (2), the bottle bottom supporting mechanism (1) is located at the bottom of the pen water bottle body (2), the inner wall of the concave ventilating bottle cap (6) is bonded with the surface of the arc-shaped supporting shrinkage body (7), the inner wall of the concave ventilating bottle cap (6) is provided with internal threads, the surface of the pen water bottle mouth ring (4) is bonded with the surface of the pen water bottle body (2), the pen water bottle mouth ring (4) is made of wood, the outer surface of the pen water bottle mouth ring (4) is provided with external threads, and the inner wall of the concave ventilating bottle cap (6) is in threaded connection with the outer surface of the pen water bottle mouth ring (4); one end of the arc-shaped supporting shrinkage body (7), which is far away from the concave ventilating bottle cap (6), is bonded with the upper surface of the sealing external thread body (9), the surface of the sealing external thread body (9) is provided with external threads, the outer surface of the sealing internal thread ring (10) is bonded with the inner wall of the bottle mouth of the pen water bottle body (2), the inner wall of the sealing internal thread ring (10) is provided with internal threads, the inner wall of the sealing internal thread ring (10) is in threaded connection with the surface of the sealing external thread body (9), the surface of the arc-shaped supporting shrinkage body (7) is arc-shaped, and a ventilating cavity (8) is arranged among the surface of the arc-shaped supporting shrinkage body (7), the inner wall of the pen water bottle mouth ring (4), the sealing internal thread ring (10) and the inner wall of the concave; the surface of the concave ventilation bottle cap (6) is provided with a vent hole (g), and the vent hole (g) is positioned above the ventilation cavity (8) and communicates the ventilation cavity (8) with the surface of the concave ventilation bottle cap (6);

the finger-pressure wiping-free mechanism (5) comprises two extrusion sliding grooves (501) and two elastic grooves (502), the extrusion sliding grooves (501) are formed in the surface of a pen ink bottle mouth ring (4), the two extrusion sliding grooves (501) are symmetrically distributed by taking the center line of the surface of the pen ink bottle mouth ring (4) as a symmetric line, the elastic grooves (502) are formed in the inner wall of the pen ink bottle mouth ring (4), the number of the elastic grooves (502) is two, and the two elastic grooves (502) are respectively located right above the two extrusion sliding grooves (501); the inner wall of the extrusion sliding groove (501) is connected with an extrusion rod (503) in a sliding mode, one end of the extrusion rod (503) extends to the interior of the pen ink bottle bottleneck ring (4), the inner wall of the pen ink bottle bottleneck ring (4) is provided with a limiting groove, the inner wall of the limiting groove is connected with a limiting block in a sliding mode, the surface of the limiting block is connected with the inner wall of the limiting groove in a sliding mode, the surface of the limiting block is bonded with the surface of the extrusion rod (503), one end, located inside the pen ink bottle bottleneck ring (4), of the extrusion rod (503) is bonded with absorbent cotton (e), one end, located outside the pen ink bottle bottleneck ring (4), of the extrusion rod (503) is provided with a finger pressure groove (504), one end, located outside the pen ink bottle bottleneck ring (4), of the extrusion rod (503) is bonded with an elastic block (505), the surface of the elastic block (505) is connected with an elastic sheet (506) in a inserting mode, and one end, far away from the elastic; the inner wall sliding connection of elasticity groove (502) has slider (507), the surface welding and the flexible extrusion iron sheet (f) of slider (507), and the surface of flexible extrusion iron sheet (f) is the arc form, and flexible extrusion iron sheet (f) is located directly over cotton (e) absorbs water, and the inner wall of elasticity groove (502) is pegged graft and is had spring (508), and the one end of spring (508) and the surface welding of slider (507).

2. A teaching pen ink bottle as claimed in claim 1, wherein: the bottle bottom supporting mechanism (1) comprises a trapezoid leakage base plate (101) and a through hole (102), the inner wall of the trapezoid leakage base plate (101) is in a trapezoid shape, the surface of the trapezoid leakage base plate (101) is welded with a plurality of supporting blocks (a), and the surface of each supporting block (a) is in lap joint with the lower surface of the pen ink bottle body (2).

3. A teaching pen ink bottle as claimed in claim 2, wherein: the inner wall center position welding of trapezoidal hourglass chassis (101) has flexible pipe (103), and through-hole (102) are seted up and are put at the central point of pen water bottle body (2) lower surface, and the inner wall bonding of through-hole (102) has sealed threaded ring (104), and the inner wall sliding connection of flexible pipe (103) has threaded rod (105), the surface of threaded rod (105) and the inner wall threaded connection of sealed threaded ring (104), and the lower surface of spill promotion sealing body (3) is provided with the bearing, the inner circle of bearing and the surface weld of threaded rod (105).

4. A teaching pen ink bottle as claimed in claim 3, wherein: the inner wall of the extension tube (103) is provided with an annular groove (106), the inner wall of the annular groove (106) is connected with a clamping block (b) in a sliding mode, the inner wall of the extension tube (103) is provided with a clamping groove (c), and the clamping groove (c) is located at the bottom of the annular groove (106) and is communicated with the annular groove (106).

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