CN109203076B

CN109203076B - PVC pipeline punches and uses cooling arrangement

Info

Publication number: CN109203076B
Application number: CN201811045001.2A
Authority: CN
Inventors: 吕长征
Original assignee: Zhejiang Industry and Trade Vocational College
Current assignee: Zhejiang Industry and Trade Vocational College
Priority date: 2018-09-07
Filing date: 2018-09-07
Publication date: 2020-05-19
Anticipated expiration: 2038-09-07
Also published as: CN109203076A

Abstract

The invention discloses a cooling device for punching a PVC (polyvinyl chloride) pipeline, which comprises a workbench, wherein both sides of the workbench are fixedly connected with cooling water tanks, the top of each cooling water tank is fixedly connected with a water pump, the water outlet end of each water pump is communicated with a Y-shaped hose, the water outlet end of each Y-shaped hose is communicated with a hard conduit, and the water outlet end of each hard conduit is fixedly connected with a spray head, wherein each spray head comprises: the device comprises a pipe seat, a fixed sleeve, a spray pipe and a water spray cover plate, wherein the pipe seat is detachably connected to the water outlet end of the hard conduit through a plurality of clamping components; the fixed sleeve is sleeved on the periphery of the spherical shell of the tube seat; the spray pipe is fixedly connected with the fixed sleeve to form an external spray part, and the fixed sleeve limits the spray pipe on the periphery of the spherical shell; the water spraying cover plate is arranged at the water outlet end of the spray pipe. Due to the adoption of the structure, the PVC pipeline cooling device can effectively cool the PVC pipeline, and the quality of the PVC pipeline is improved.

Description

PVC pipeline punches and uses cooling arrangement

Technical Field

The invention relates to the technical field of plastic processing, in particular to cooling equipment for punching a PVC (polyvinyl chloride) pipeline.

Background

Among the non-metallic pipes, the most widely used are plastic pipes. Plastic pipes are widely available and are classified into two broad categories, thermoplastic pipes and thermosetting pipes. The thermoplastic material includes polyvinyl chloride pipe, polyethylene pipe, polypropylene pipe, polyformaldehyde pipe, etc.; belongs to thermosetting phenolic plastic pipes and the like. The plastic pipe has the advantages of good corrosion resistance, light weight, convenient forming, easy processing and the like, so the plastic pipe is more and more widely applied to the building engineering, the plastic pipe needs to be punched sometimes in the processing process, the plastic pipe is easily softened due to the lower melting point of the plastic pipe and overhigh temperature in the punching process, and the deformation of a punching notch is possibly caused to seriously affect the quality of the plastic pipe.

Chinese patent CN201711349164.5 discloses a plastic conduit punches and uses cooling device, comprises a workbench, the equal fixedly connected with support column in both sides of workstation top front end and back end, the top fixedly connected with roof of support column, the inboard sliding connection of support column has the lifter plate, the top fixedly connected with puncher of lifter plate, the bottom of puncher is provided with the drill bit, the top fixedly connected with electric telescopic handle of roof, wherein, the equal fixedly connected with coolant tank in both sides of workstation, coolant tank's top fixedly connected with water pump, the play water end intercommunication of water pump have the Y shape hose, and the play water end intercommunication of Y shape hose has stereoplasm pipe, the play water end fixedly connected with shower nozzle of stereoplasm pipe.

The incision department of drill bit and the work piece that punches can not be sprayed comprehensively to shower nozzle spun water among the above-mentioned patent document, therefore the cooling effect is not good, and shower nozzle and stereoplasm pipe fixed connection in addition when the shower nozzle damages, can not change the shower nozzle alone, and the waste resource has shortened the life of whole device.

Disclosure of Invention

In view of the above, the invention provides the cooling equipment for punching the PVC pipeline, which has the advantages of good cooling effect and long service life.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a PVC pipeline punches and uses cooling arrangement, includes the workstation, the equal fixedly connected with coolant tank in both sides of workstation, coolant tank's top fixedly connected with water pump, the play water end intercommunication of water pump has Y shape hose, the delivery port intercommunication of Y shape hose has the stereoplasm pipe, the play water end of stereoplasm pipe is equipped with the shower nozzle, wherein, the shower nozzle includes:

the pipe seat is detachably connected to the water outlet end of the hard conduit through a plurality of clamping components distributed in an annular manner;

the fixing sleeve is sleeved on the periphery of the water inlet side of the spherical shell of the tube seat;

one end of the spray pipe is sleeved on the periphery of the water outlet side of the spherical shell, and the spray pipe is fixedly connected with the fixed sleeve to form an external spray piece;

the water spraying cover plate is arranged at the water outlet end of the spray pipe.

Furthermore, the clamping assembly comprises a clamping arm and a pair of elastic clamping seats fixedly arranged on the connecting pipe of the pipe seat at intervals, one end of the clamping arm is pivoted on the pair of elastic clamping seats, the other end of the clamping arm can be clamped and connected with a clamping ring on the outer peripheral surface of the hard conduit to enable the connecting pipe to be connected with the hard conduit, and the connecting pipe is connected to the water inlet of the spherical shell.

Furthermore, the clamping arm is provided with a rotary rod, two ends of a rotating shaft located at one end of the rotary rod are respectively pivoted in the pivoting grooves of the corresponding elastic clamping seats, a clamping rod is arranged on the inner side surface of the other end of the rotary rod, an arc-shaped clamping head is arranged on the inner side surface of the clamping rod, and the arc-shaped clamping head can be connected with the clamping ring in a clamping mode.

Furthermore, the elastic clamping seat is provided with an arc plate, two ends of the arc plate are respectively and sequentially connected with a folding plate and an extending plate, the bottom ends of the folding plates are close to each other, the pivoting groove is formed between the folding plate and the arc plate, the extending plates extend outwards from two sides of the arc plate, and the extending plates are fixedly arranged on the connecting pipe.

Further, the spray tube includes consecutive first ball cover, taper pipe, pipe and nozzle, is located first flange portion on the first ball cover periphery with be located fixed cover second flange portion fixed connection on the periphery, wherein, the play water end of nozzle is bar poroid, just the both sides face of nozzle all inwards caves in.

Furthermore, an annular boss is arranged on the periphery of the connecting pipe, and the extension plate is fixedly arranged on the end face, close to the spherical shell, of the annular boss.

Furthermore, a pair of rubber pads is arranged between the outer spraying piece and the spherical shell, the pair of rubber pads are arranged oppositely, one rubber pad is positioned between the fixed sleeve and the spherical shell, and the other rubber pad is positioned between the spraying pipe and the spherical shell.

Furthermore, the rubber pad comprises a third ball sleeve and a third flange part, the third ball sleeve is located between the outer spraying piece and the spherical shell, and the third flange part is clamped between the first flange part and the second flange part.

Furthermore, five rows of water spray holes arranged on the water spray cover plate are respectively a row of first water spray holes, two rows of second water spray holes positioned on two sides of the row of first water spray holes and two rows of third water spray holes positioned on the outer sides of the two rows of second water spray holes, each row of water spray holes are sequentially distributed along the length direction of the water spray cover plate, the second water spray holes and the third water spray holes are obliquely arranged, and the water spray included angles formed by the two rows of second water spray holes are smaller than the water spray included angles formed by the two rows of third water spray holes.

Furthermore, a sealing washer is arranged between the water outlet end of the hard conduit and the water inlet end of the pipe seat, and the sealing washer is positioned in a step hole at the end part of the pipe seat.

The technical scheme can show that the invention has the advantages that:

1. the spray head and the hard guide pipe are detachably connected, so that when the spray head is damaged, the spray head can be replaced, resources are saved, and the service life of the spray head is prolonged;

2. the spray head comprises a pipe seat, a fixed sleeve, a spray pipe and other structures, wherein the fixed sleeve and the spray pipe as well as the pipe seat and an external spray part are detachably connected, so that when each part in the spray head has a problem, the spray head is convenient to replace and maintain;

3. a sealing washer is arranged between the hard conduit and the pipe seat, so that the sealing effect of the cooling device is optimized, and the cooling liquid is prevented from leaking outwards;

4. according to the invention, the pair of rubber pads are arranged between the outer spraying piece and the spherical shell of the pipe seat, the rubber pads not only have a sealing effect, but also increase the friction force between the outer spraying piece and the spherical shell, so that the spraying pipe can be more stably limited on the periphery of the spherical shell, and the spraying pipe is prevented from rotating;

5. the inner diameter of the pipe seat is changed from small to small and then changed from large to small, and the pressure is changed from large to small and then changed to large, so that the flow speed of cooling liquid flowing out from the outflow hole of the pipe seat is high, when the cooling liquid flows into the spray pipe from the outflow hole, the inner diameter is changed from large to small and then changed from small to large and the pressure is changed from small to small, thereby realizing atomization of the cooling liquid, further cooling the cut of the punching drill bit and the PVC pipeline, uniformly cooling and saving the cooling liquid;

6. the water outlet end of the nozzle is provided with the water spraying cover plate, the water spraying cover plate is provided with a row of first water spraying holes, two rows of second water spraying holes and two rows of third water spraying holes, the row of first water spraying holes are positioned on the axis of the water spraying cover plate, the two rows of second water spraying holes are respectively arranged on two sides of the row of first water spraying holes, the two rows of third water spraying holes are respectively arranged on two sides of the two rows of second water spraying holes, the second water spraying holes and the third water spraying holes are outwards expanded relative to the first water spraying holes at a certain angle, and the included angle between the axis of the third water spraying holes and the axis of the water spraying cover plate is larger than the included angle between the axis of the second water spraying holes and the axis of the water spraying cover plate, so that the spraying range of cooling liquid is expanded, and the cutting opening of a.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:

fig. 1 is a schematic structural view of a head of the present invention.

Fig. 2 is an enlarged view at I in fig. 1.

Fig. 3 is a sectional view taken along the direction B-B of fig. 1.

FIG. 4 is a half sectional view of a stem of the present invention.

Fig. 5 is a schematic structural view of the nozzle of the present invention.

FIG. 6 is a cross-sectional view of the spout of the present invention.

Fig. 7 is a cross-sectional view of the harness of the present invention.

Fig. 8 is a cross-sectional view of the rubber pad of the present invention.

Fig. 9 is a front view of the latch arm of the present invention.

Fig. 10 is a top view of the latch arm of the present invention.

Fig. 11 is a schematic structural diagram of the elastic clamping seat of the invention.

Fig. 12 is a cross-sectional view of the sprinkler cover of the present invention.

Fig. 13 is a front view of the sprinkler cover of the present invention.

Labeled as: the water spray pipe comprises a hard guide pipe 10, a clamping ring 101, a spray head 20, a pipe seat 1, a connecting pipe 11, a stepped hole 111, a spherical shell 12, an annular boss 13, a hollow groove 131, an outward flowing hole 14, a spray pipe 2, a first spherical sleeve 21, a spherical annular groove 211, a taper pipe 22, a circular pipe 23, a spray nozzle 24, a first flange part 25, a fixing sleeve 3, a second spherical sleeve 31, a second flange part 32, a rubber pad 4, a third spherical sleeve 41, a third flange part 42, a clamping arm 5, a rotary rod 51, an arc-shaped bent part 511, a clamping rod 52, an arc-shaped clamping head 521, a rotating shaft 53, an elastic clamping seat 6, an arc-shaped plate 61, a folded plate 62, an extending plate 63, a pivoting groove 64, a water spray cover plate 7, a first water spray hole 71, a second water spray hole 72, a third.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 13, a cooling device for punching a PVC pipeline comprises a workbench, wherein cooling water tanks are fixedly connected to both sides of the workbench, a water pump is fixedly connected to the top of the cooling water tank, the water outlet end of the water pump is communicated with a Y-shaped hose, the water outlet end of the Y-shaped hose is communicated with a hard conduit 10, as shown in fig. 1 and 3, a nozzle 20 is arranged at the water outlet end of the hard conduit 10, wherein the nozzle 20 comprises a tube seat 1, a fixed sleeve 3, a spray tube 2 and a water spraying cover plate 7, the tube seat 1 is detachably connected to the water outlet end of the hard conduit 10 through a plurality of clamping components distributed in an annular shape, the fixed sleeve 3 is sleeved on the periphery of the water inlet side of a spherical shell 12 of the tube seat 1, one end of the spray tube 2 is sleeved on the periphery of the water outlet side of the spherical shell 12, and the spray tube 2 and the fixed sleeve 3, the water spraying cover plate 7 is arranged at the water outlet end of the spray pipe 2, and due to the fact that the spray head 20 and the hard guide pipe 10 are detachably connected, when the spray head 20 is damaged, the spray head 20 can be replaced, resources are saved, the service life of the water spraying device is prolonged, in addition, the fixing sleeve 3 and the spray pipe 2 and the pipe seat 1 and an external spraying piece are detachably connected, and therefore when internal parts of the spray head 20 are in trouble, the internal parts can be replaced independently, and resources are saved.

As shown in fig. 3, 7 and 8, a pair of rubber pads 4 is arranged between the external spraying member and the spherical shell 12, the pair of rubber pads 4 are arranged oppositely, wherein, one rubber pad 4 is positioned between the fixed sleeve 3 and the spherical shell 12, the other rubber pad 4 is positioned between the spray pipe 2 and the spherical shell 12, the rubber pad 4 comprises a third ball sleeve 41 and a third flange part 42, the third ball sleeve 41 is sleeved between the external spraying piece and the spherical shell 12, the third flange part 42 is clamped between the first flange part 25 positioned on the outer periphery of the water inlet end of the spray pipe 2 and the second flange part 32 positioned on the outer periphery of the fixed sleeve 3, the rubber gasket 4 not only has a sealing function, but also increases the friction between the outer spray member and the spherical shell 12, so that the spray pipe 2 can be more firmly limited on the periphery of the spherical shell 12, and the spray pipe 2 is prevented from rotating.

As shown in fig. 3, a sealing washer 8 is arranged between the water outlet end of the hard conduit 10 and the water inlet end of the pipe seat 1, the sealing washer 8 is located in the stepped hole 111 at the end of the pipe seat 1, and the sealing washer 8 optimizes the sealing effect of the present invention and prevents the coolant from leaking outside.

As shown in fig. 2 and 3, the clamping assembly includes a clamping arm 5 and a pair of elastic clamping seats 6 fixed on a connecting pipe 11 of the pipe seat 1 at intervals, one end of the clamping arm 5 is pivoted on the pair of elastic clamping seats 6, and the other end of the clamping arm 5 can be clamped and connected with a clamping ring 101 located on the outer peripheral surface of the hard conduit 10 to connect the connecting pipe 11 and the hard conduit 10 together, wherein the connecting pipe 11 is connected to the water inlet of the spherical shell 12, and due to the arrangement of the elastic clamping seats 6, the clamping between the clamping arm 5 and the hard conduit 10 is more firm under the elastic force of the elastic clamping seats 6.

As shown in fig. 4, an annular boss 13 is disposed on the periphery of the connection pipe 11, the extension plate 63 of the elastic clamping seat 6 is fixedly disposed on the end surface of the annular boss 13 close to the spherical shell 12, a plurality of empty slots 131 are disposed on the annular boss 13, the empty slots 131 penetrate through the annular boss 13, one end of the rotating rod 51 of the clamping arm 5 penetrates through the corresponding empty slot 131 and is pivoted in the corresponding pivoting slot 64 of the elastic clamping seat 6, and the inner diameter of the pipe seat 1 is reduced from small to large, so that the pressure is increased from large to small, and the flow rate is high when the cooling liquid flows out from the outflow hole 14 of the pipe seat 1.

As shown in fig. 3, 9, 10 and 11, two ends of a rotating shaft 53 at one end of the rotating rod 51 are respectively pivoted in corresponding pivoting grooves 64, a clamping rod 52 is arranged on an inner side surface of the other end of the rotating rod 51, an arc-shaped clamping head 521 is arranged on an inner side surface of the clamping rod 52, the arc-shaped clamping head 521 can be connected with the clamping ring 101 in a clamping manner, and due to the arrangement of the clamping arm 5, when the cooling device for punching a PVC pipe is not used, the rotating rod 51 can be rotated by a certain angle to be separated from the hard conduit 10, the spray head 20 is placed independently, the nozzle 24 of the spray head 20 is prevented from being blocked, and the cooling device is convenient to use next time.

In this embodiment, the other end of the rotating rod 51 is provided with an arc bending part 511, which is convenient for an operator to rotate the rotating rod 51.

As shown in fig. 3 and 11, the elastic clamping seat 6 has an arc plate 61, two ends of the arc plate 61 are respectively and sequentially connected with a folding plate 62 and an extension plate 63, bottom ends of the folding plates 62 are close to each other, the pivoting groove 64 is formed between the folding plates 62 and the arc plate 61, the extension plates 63 extend out of two sides of the arc plate 61, the extension plates 63 are fixedly disposed on the connecting pipe 11, when the clamping arm 5 is clamped and connected with the hard conduit 10, first, two ends of the rotating shaft 53 on the clamping arm 5 are respectively pressed into the corresponding pivoting grooves 64 to pivot the clamping arm 5 and the corresponding elastic clamping seat 6 together, and when the arc clamping head 521 is clamped with the clamping ring 101, the elastic clamping seat 6 is elastically deformed to stably and reliably connect the clamping arm 5 and the hard conduit 10.

As shown in fig. 5, fig. 6 and fig. 7, the spray pipe 2 includes the first ball sleeve 21, the taper pipe 22 and the round pipe 23 that link to each other in proper order, is located the first flange portion 25 in the first ball sleeve 21 periphery with be located in the fixed cover 3 periphery the second flange portion 32 fixed connection, wherein, the play water end of nozzle 24 is the bar poroid, just the both sides face of nozzle 24 all inwards caves in, because during coolant liquid flowed into spray pipe 2 from the outflow hole 14, the internal diameter diminishes again from big grow, and pressure diminishes again from little grow to realize coolant liquid atomizing, and then cool off the incision department of drill bit and PVC pipeline, the cooling is even, and practices thrift the coolant liquid.

In this embodiment, the inner diameter of the nozzle 24 is changed from large to small and then becomes large, that is, the water inlet end and the water outlet end of the nozzle 24 are both in a horn shape, so that the outlet pressure of the nozzle 24 is smaller than the inlet pressure loss, and the spraying range of the cooling liquid sprayed out from the nozzle 24 is large, so that the cooling effect of the cooling liquid on the cutting openings of the drilling bit and the PVC pipeline is good.

As shown in fig. 12 and 13, the five rows of water spraying holes arranged on the water spraying cover plate 7 are respectively a row of first water spraying holes 71, two rows of second water spraying holes 72 positioned at two sides of the row of first water spraying holes 71, and two rows of third water spraying holes 73 positioned at the outer sides of the two rows of second water spraying holes 72, each row of water spraying holes are sequentially distributed along the length direction of the water spraying cover plate 7, the second water spraying holes 72 and the third water spraying holes 73 are obliquely arranged, and the water spraying included angle formed by the two rows of second water spraying holes 72 is smaller than the water spraying included angle formed by the two rows of third water spraying holes 73, so that the spraying range of the cooling liquid is expanded, and the cutting opening of the perforating drill bit and the PVC pipe can be cooled.

In this embodiment, the included angle between the axis of the second water jet hole 72 and the axis of the water jet cover plate 7 is 5 °, the included angle between the axis of the third water jet hole 73 and the axis of the water jet cover plate 7 is 10 °, and at this time, the spraying range of the cooling liquid sprayed from the water jet cover plate 7 is the largest.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a PVC pipeline punches and uses cooling arrangement, comprises a workbench, the equal fixedly connected with coolant tank in both sides of workstation, coolant tank's top fixedly connected with water pump, the play water end intercommunication of water pump has Y shape hose, the delivery port intercommunication of Y shape hose has stereoplasm pipe (10), the play water end of stereoplasm pipe (10) is equipped with shower nozzle (20), its characterized in that, shower nozzle (20) include:

the pipe seat (1) is detachably connected to the water outlet end of the hard conduit (10) through a plurality of clamping components distributed in an annular manner;

the fixing sleeve (3), the fixing sleeve (3) is sleeved on the periphery of the water inlet side of the spherical shell (12) of the tube seat (1);

one end of the spray pipe (2) is sleeved on the periphery of the water outlet side of the spherical shell (12), and the spray pipe (2) is fixedly connected with the fixed sleeve (3) to form an external spray part;

the water spraying cover plate (7), the water spraying cover plate (7) is arranged at the water outlet end of the spray pipe (2);

wherein, the clamping assembly comprises a clamping arm (5) and a pair of elastic clamping seats (6) fixedly arranged on a connecting pipe (11) of the pipe seat (1) at intervals, one end of the clamping arm (5) is pivoted on the pair of elastic clamping seats (6), the other end of the clamping arm (5) can be clamped and connected with a clamping ring (101) positioned on the outer peripheral surface of the hard conduit (10) to enable the connecting pipe (11) to be connected with the hard conduit (10), wherein the connecting pipe (11) is connected on a water inlet of the spherical shell (12), the clamping arm (5) is provided with a rotating rod (51), two ends of a rotating shaft (53) positioned at one end of the rotating rod (51) are respectively pivoted in pivoting grooves (64) of the corresponding elastic clamping seats (6), a clamping rod (52) is arranged on the inner side surface of the other end of the rotating rod (51), and an arc-shaped clamping head (521) is arranged on the inner side surface of the clamping rod (52), arc dop (521) can with snap ring (101) block is connected, arc dop (521) with during snap ring (101) block elastic deformation takes place for elastic clamping seat (6) makes card arm (5) with stereoplasm pipe (10) are connected stably, reliably, elastic clamping seat (6) have circular arc board (61), the both ends of circular arc board (61) connect gradually a folded plate (62) and an extension board (63) respectively, and the bottom of a pair of folded plate (62) is close to each other, forms between a pair of folded plate (62) and circular arc board (61) pin joint groove (64), and a pair of extension board (63) extend outward respectively to the both sides of circular arc board (61), extension board (63) are fixed to be set up on connecting pipe (11).

2. The PVC pipe perforating cooling device as recited in claim 1, characterized in that the nozzle (2) comprises a first ball sleeve (21), a conical pipe (22), a circular pipe (23) and a nozzle (24) which are connected in sequence, a first flange part (25) located on the outer periphery of the first ball sleeve (21) is fixedly connected with a second flange part (32) located on the outer periphery of the fixed sleeve (3), wherein the water outlet end of the nozzle (24) is in the shape of a strip hole, and both side surfaces of the nozzle (24) are recessed inwards.

3. The PVC pipe perforating cooling device as recited in claim 1, characterized in that an annular boss (13) is provided on the outer circumference of the connecting pipe (11), and the extension plate (63) is fixedly disposed on the end surface of the annular boss (13) close to the spherical shell (12).

4. The PVC pipe perforating cooling device as claimed in claim 2, characterized in that a pair of rubber pads (4) is provided between said external spray member and said spherical shell (12), a pair of rubber pads (4) being oppositely disposed, wherein one rubber pad (4) is located between said harness (3) and said spherical shell (12) and the other rubber pad (4) is located between said spray pipe (2) and said spherical shell (12).

5. The PVC pipe perforating cooling device as recited in claim 4, characterized in that said rubber gasket (4) comprises a third ball sleeve (41) and a third flange portion (42), said third ball sleeve (41) being located between said external spray member and said spherical shell (12), said third flange portion (42) being interposed between a first flange portion (25) located on the outer circumference of said first ball sleeve (21) and a second flange portion (32) located on the outer circumference of said fixed sleeve (3).

6. The PVC pipe punching cooling device according to claim 1, wherein the five rows of water spraying holes arranged on the water spraying cover plate (7) are respectively a row of first water spraying holes (71), two rows of second water spraying holes (72) positioned at two sides of the row of first water spraying holes (71) and two rows of third water spraying holes (73) positioned at the outer sides of the two rows of second water spraying holes (72), each row of water spraying holes are distributed along the length direction of the water spraying cover plate (7) in sequence, the second water spraying holes (72) and the third water spraying holes (73) are arranged in an inclined mode, and the water spraying included angle formed by the two rows of second water spraying holes (72) is smaller than the water spraying included angle formed by the two rows of third water spraying holes (73).

7. The PVC pipe perforating cooling apparatus as claimed in claim 1, wherein a sealing gasket (8) is provided between the water outlet end of the rigid conduit (10) and the water inlet end of the pipe socket (1), the sealing gasket (8) being located in the stepped hole (111) at the end of the pipe socket (1).