A guide head for tube insertion in a shell and tube heat exchanger

Abstract

The application discloses a guide head for pipe penetrating of a column-tube heat exchanger and belongs to the field of heat exchanger pipe installation devices. The guide head is used for pipe penetrating installation of heat exchanger pipes in a heat exchanger and comprises a connecting rod which is detachably connected with a heat exchanger pipe port. A plurality of groups of pressing mechanisms which are in abutment with the inner wall of the heat exchanger pipe are arranged on the side wall of the connecting rod. A guide part is connected with the end of the connecting rod which is far away from the heat exchanger pipe port through a bearing. The gravity center of the guide part is offset through the arrangement of the counterweight, so that the posture of the guide part is always in a state that the penetrating tip is on the top and the guide inclined plane is on the bottom. In the pipe penetrating process, as long as the end of the penetrating tip is not lower than the penetrating hole channel, the guide part can penetrate into the penetrating hole under the action of the thrust force, so as to guide the heat exchanger pipe to penetrate into the penetrating hole, increase the success rate of the heat exchanger pipe penetrating and improve the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of heat exchange pipe installation device, and particularly relates to a guide head for pipe insertion of a column-tube heat exchanger. BACKGROUND

[0002] The current column-tube heat exchanger pipe insertion is performed manually. Since the size of the heat exchange pipe is slightly different from the size of the baffle, the heat exchange pipe is affected by gravity and bending of the pipe fitting during pipe insertion, which causes the pipe fitting to be eccentric to the pipe hole, resulting in pipe insertion failure and greatly reduced pipe insertion accuracy, especially in the second half of the pipe insertion work. At this time, two workers work in pairs, one handles the blocked pipe head at the baffle, and the other rotates the heat exchange pipe to align the pipe head to the pipe hole.

[0003] In the original technology, since the heat exchanger is assembled by multiple baffles, the relative position concentricity of each corresponding pipe hole is not high, and during pipe insertion, the pipe fitting may be severely deviated due to eccentricity of the baffle pipe hole. Workers may insert the pipe fitting into other adjacent pipe holes during long-term high-intensity work, resulting in pipe fitting scrap and baffle damage. Due to the influence of gravity, the pipe fitting may appear to be "drooping", and the assembly work of the large-interval baffle heat exchanger cannot be efficiently completed at the present stage. SUMMARY

[0004] The present application provides a guide head for pipe insertion of a column-tube heat exchanger to solve at least one of the above technical problems.

[0005] The technical solution adopted by the present application is as follows:

[0006] A guide head for pipe insertion of a column-tube heat exchanger for pipe insertion and installation of heat exchange pipes in a heat exchanger, comprising a connecting rod detachably connected to a heat exchange pipe port, a plurality of jacking mechanisms on the side wall of the connecting rod abutting against the inner wall of the heat exchange pipe, a guide portion connected to the end of the connecting rod away from the heat exchange pipe port through a bearing, the end face of the guide portion away from the heat exchange pipe being an inclined guide surface arranged from one side to the opposite side, the end of the guide surface away from the heat exchange pipe being a perforation tip, and a counterweight being arranged on the side wall opposite to the perforation tip to make the center of gravity of the guide portion deviate to the side opposite to the perforation tip.

[0007] Preferably, a driving mechanism for driving the jacking mechanism to j ack the inner wall of the heat exchange pipe is further included, and the guide portion is rotatable relative to the connecting rod to enable the driving mechanism to drive the jacking mechanism to j ack the inner wall of the heat exchange pipe.

[0008] Preferably, the tightening mechanism comprises a plurality of groups of sliding grooves arranged circumferentially along the connecting rod, a tightening ball is slidably connected in the sliding groove, the diameter of the tightening ball is the same as the inner diameter of the sliding groove, and a spring is fixedly connected between the tightening ball and the inner wall of the sliding groove.

[0009] Preferably, the driving mechanism comprises an oil tank, the oil tank is connected with the sliding groove through an oil guide mechanism, the oil guide mechanism comprises an oil cylinder, a piston is slidably connected in the oil cylinder, a push rod is fixedly connected to the piston, an oil inlet pipe is connected between the oil tank and the oil cylinder, an oil outlet pipe is connected between the oil cylinder and the sliding groove, a one-way valve is arranged on the oil inlet pipe and the oil outlet pipe to allow the oil in the oil tank to flow in one direction along the oil inlet pipe, the oil cylinder, the oil outlet pipe and the sliding groove, and the guide part is provided with a driving member near one end of the connecting rod for driving the piston to reciprocatingly slide.

[0010] Preferably, the guide slope is a plane or an arc surface.

[0011] Preferably, the guide part is made of Teflon plastic material, the center of gravity of the counterweight is located on the side of the counterweight away from the perforated tip, and the counterweight is a lead block.

[0012] Preferably, the outer edge of the guide slope is provided with a rounded corner.

[0013] Preferably, the upper end of the sliding groove is provided with an anti-disengagement flange.

[0014] Preferably, the driving member comprises a driving gear, the driving gear is arranged at the end of the guide part close to the connecting rod, and the driving gear is coaxially arranged with the guide part, the end of the connecting rod close to the guide part is provided with a circular groove, the circular groove is coaxially arranged with the driving gear, a rotating shaft is rotatably connected to the inner wall of the circular groove, a driven gear is arranged on the rotating shaft, the driven gear is engaged with the driving gear, a cam is arranged on the rotating shaft, and the cam is slidably connected with the push rod.

[0015] Preferably, an oil return pipeline is connected between the sliding groove and the oil tank, and a pressure control valve is arranged on the oil return pipeline.

[0016] Thanks to the above technical scheme, the application has the following beneficial effects:

[0017] 1. The process of using the present application to perform the pipe-through work, because the guide part away from the end face of the heat exchange pipe is a guide inclined surface inclined from one side to the opposite side, so that the end of the guide inclined surface away from the heat exchange pipe is provided with a perforated tip, and the cross-sectional area of the perforated tip is smaller than that of the through hole on the baffle, therefore, the perforated tip can easily pass through the through hole on the baffle, and the guide head and the heat exchange pipe can be guided during the process of the guide head passing through the through hole. As the section of the heat exchange pipe inserted into the heat exchanger gradually increases, the pipe end of the heat exchange pipe will sag due to gravity, and because the guide part away from the end face of the heat exchange pipe is a guide inclined surface inclined from one side to the opposite side, so that the end of the guide inclined surface away from the heat exchange pipe is designed to have a perforated tip, so that the perforated tip can still pass out of the coaxial through hole in front after the pipe end of the heat exchange pipe sags due to gravity, ensuring the accuracy and efficiency of the installation of the heat exchange pipe, and also eliminating the error of the coaxiality of the through hole between adjacent baffles, increasing the success rate of pipe-through. In addition, it should be noted that during the pipe-through process, the worker or mechanical equipment can make the heat exchange pipe slide forward while rotating, which can reduce the frictional resistance between the heat exchange pipe and the inner wall of the through hole, thereby improving the efficiency of the pipe-through. The guide part and the connecting rod can be relatively rotated through the setting of the bearing, and the center of gravity of the guide part is offset through the setting of the counterweight, so that the posture of the guide part is always in the state of the perforated tip on top and the guide inclined surface on the bottom. During the pipe-through process, as long as the end of the perforated tip is not lower than the through hole channel, the guide part can be inserted into the through hole under the action of the pushing force, thereby guiding the heat exchange pipe to pass into the through hole.

[0018] It should be noted that after the guide part, the connecting rod, the bearing and the heat exchange pipe are connected, the cross section of any adjacent connection is the same as the diameter of the through hole, thereby avoiding the clamping between the connection and the edge of the through hole during the pipe-through process.

[0019] 2. As a preferred embodiment of the present application, a driving mechanism for driving the top-tightening mechanism to tighten the inner wall of the heat exchange pipe is provided, and the guide part is relatively rotated with the connecting rod to drive the driving mechanism to drive the top-tightening mechanism to tighten the inner wall of the heat exchange pipe.

[0020] The setting of the driving mechanism facilitates the driving of the top-tightening mechanism to increase the pressure between the top-tightening mechanism and the inner wall of the heat exchange pipe, and increase the stability of the connection between the connecting rod and the heat exchange pipe, thereby avoiding loosening or falling off of the connection between the connecting rod and the heat exchange pipe during the pipe-through process. During the rotation of the heat exchange pipe, the driving mechanism can further increase the positive pressure between the top-tightening mechanism and the inner wall of the heat exchange pipe, thereby further ensuring the stability of the connection between the connecting rod and the heat exchange pipe during the rotation of the heat exchange pipe.

[0021] 3. As a preferred embodiment of the present application, the tightening mechanism comprises a plurality of groups of sliding grooves arranged circumferentially along the connecting rod, a tightening ball is slidably connected in the sliding groove, the diameter of the tightening ball is the same as the inner diameter of the sliding groove, and a spring is fixedly connected between the tightening ball and the inner wall of the sliding groove.

[0022] The sliding grooves are arranged in 4-6 groups along the axial direction of the connecting rod, preferably 6 groups, and the sliding grooves are arranged in two rows along the axial direction of the connecting rod to increase the stability of the connection between the connecting rod and the heat exchange pipe. Specifically, when the connecting rod is connected with the heat exchange pipe, the connecting rod is inserted into the heat exchange pipe, the tightening ball is in contact with the inner wall of the heat exchange pipe under the action of the spring, and the normal pressure between the tightening ball and the inner wall of the heat exchange pipe increases the stability of the connection between the connecting rod and the heat exchange pipe.

[0023] The upper end of the sliding groove is provided with an anti-falling flange. The anti-falling flange can limit the position of the tightening ball and prevent the tightening ball from falling out of the sliding groove.

[0024] 4. As a preferred embodiment of the present application, the driving mechanism comprises an oil tank, the oil tank is connected with the sliding groove through an oil guide mechanism, the oil guide mechanism comprises an oil cylinder, a piston is slidably connected in the oil cylinder, a push rod is fixedly connected to the piston, an oil inlet pipe is connected between the oil cylinder and the oil tank, an oil outlet pipe is connected between the oil cylinder and the sliding groove, a one-way valve is arranged on the oil inlet pipe and the oil outlet pipe to allow the oil in the oil tank to flow in one direction along the oil inlet pipe, the oil cylinder, the oil outlet pipe and the sliding groove, and a driving part is arranged at one end of the guide part close to the connecting rod to drive the piston to slide back and forth.

[0025] When the guide part rotates relative to the connecting rod, the driving part drives the piston to slide back and forth in the oil cylinder. When the oil cylinder slides towards the push rod, the hydraulic oil in the oil tank enters the oil cylinder through the oil inlet pipe. When the piston slides away from the push rod, the hydraulic oil in the oil cylinder is pressed into the sliding groove through the oil outlet pipe. The hydraulic oil in the sliding groove exerts pressure on the tightening ball, further increasing the pressure between the tightening ball and the inner wall of the heat exchange pipe, and further ensuring the stability of the connection between the connecting rod and the heat exchange pipe when the guide part rotates relative to the connecting rod.

[0026] The driving part comprises a driving gear, the driving gear is arranged at one end of the guide part close to the connecting rod, and the driving gear is coaxially arranged with the guide part. The connecting rod is provided with a circular groove at one end close to the guide part, the circular groove is coaxially arranged with the driving gear, a rotating shaft is rotatably connected to the inner wall of the circular groove, a driven gear is arranged on the rotating shaft, the driven gear is engaged with the driving gear, a cam is arranged on the rotating shaft, and the cam is slidably connected with the push rod.

[0027] When the guide rotates relative to the connecting rod, the driving gear drives the rotating shaft to rotate through the driven gear, the cam rotates the rotating shaft and drives the piston to reciprocate in the oil cylinder through the push rod, and then the hydraulic oil in the oil cylinder is guided into the sliding groove to pressurize the ball.

[0028] 5. As a preferred embodiment of the present application, the guide is made of Teflon plastic material, the center of gravity of the weight is located on the side of the weight away from the piercing tip, and the weight is a lead block.

[0029] The manufacturing material of the guide in Teflon plastic can improve the service life of the guide, and the Teflon plastic is relatively smooth, which is beneficial to the smooth passing of the guide through the piercing hole. The shape of the weight can be designed to gradually increase from bottom to top, so that the center of gravity of the weight is biased downward, and then the piercing tip of the guide is always above and the guide slope is always below the piercing tip.

[0030] 6. As a preferred embodiment of the present application, the sliding groove is connected with the oil tank through an oil return pipeline, and a pressure control valve is arranged on the oil return pipeline.

[0031] After the heat exchange pipe is pierced, the hydraulic oil in the sliding groove is returned to the oil tank through the oil return pipeline by opening the pressure control valve, the pressure in the sliding groove is reduced, the pressure between the pressing ball and the inner wall of the heat exchange pipe is reduced, and the operator can pull out the connecting rod from the heat exchange pipe by using a smaller pulling force. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structural schematic view of the embodiment of the present application;

[0033] Figure 2 is a structural schematic view of the weight in the embodiment of the present application;

[0034] Figure 3 is a second structural schematic view of the embodiment of the present application;

[0035] Figure 4 is a third structural schematic view of the embodiment of the present application;

[0036] Figure 5 is a structural schematic view of the embodiment of the present application Figure 4 is an enlarged view of part A.

[0037] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and the descriptions thereof are used to explain the present application, and do not constitute improper limitations on the present application.

[0038] In the drawings:

[0039] 1, guide part; 101, guide slope; 102, counterweight; 103, driving gear; 2, connecting rod; 3, bearing; 4, sliding groove; 401, ball; 402, spring; 5, circular groove; 6, rotating shaft; 601, driven gear; 602, cam; 7, oil cylinder; 701, piston; 702, push rod; 703, oil inlet pipe; 704, oil outlet pipe; 8, oil tank; 801, oil return pipe. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail with reference to the accompanying drawings.

[0041] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details given herein. In other instances, well-known methods have not been described in detail in order to avoid unnecessarily obscuring the present application.

[0042] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like 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 present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection, or communication; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the present specification, the description of the terms "embodiment", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] Reference Figures 1-5 A guide head for tube insertion of a tube heat exchanger, used for tube insertion installation of heat exchange tubes in a heat exchanger, comprising a connecting rod 2 detachably connected with a heat exchange tube port, a plurality of sets of pressing mechanisms for abutting against the inner wall of the heat exchange tube are arranged on the side wall of the connecting rod 2, a guide part 1 is connected to the end of the connecting rod 2 away from the heat exchange tube port through a bearing 3, the end face of the guide part 1 away from the heat exchange tube is an inclined guide slope 101 arranged from one side to the opposite side, the end of the guide slope 101 away from the heat exchange tube is a perforating tip, and a counterweight 102 is arranged on the side wall of the guide part 1 opposite to the perforating tip so that the center of gravity of the guide part 1 is deviated to the side opposite to the perforating tip.

[0046] As understood by those skilled in the art, the heat exchanger is assembled by a plurality of baffle plates, a plurality of insertion holes for inserting heat exchange tubes are arranged on the surface of the baffle plates, the insertion holes on the corresponding positions of adjacent baffle plates are coaxially arranged, before installation, the operator needs to first insert the connecting rod 2 into the tube end of the heat exchange tube and abut the connecting rod 2 against the inner wall of the heat exchange tube through the pressing mechanism, so as to fix the connecting rod 2 with the heat exchange tube, the operator can send the heat exchange tube into the insertion hole through a feeding machine, so that the heat exchange tube passes through the insertion holes of each baffle plate on the same axis in sequence, and the heat exchange tube penetrates from one end of the heat exchanger to the other end, or the installation of the heat exchange tube can be completed by manual tube insertion.

[0047] In the process of penetrating the tube, the guide part 1 away from the end face of the heat exchange tube is a guide slope 101 inclined from one side to the opposite side, so that the end of the guide slope 101 away from the heat exchange tube has a penetrating tip, and the cross-sectional area of the penetrating tip is smaller than that of the penetrating hole on the baffle. Therefore, the penetrating tip can easily pass through the penetrating hole on the baffle. The guide slope 101 can guide the guide head and the heat exchange tube when the guide head penetrates the penetrating hole. As the section of the heat exchange tube inserted into the heat exchanger gradually increases, the tube end will sag due to gravity. Because the guide part 1 away from the end face of the heat exchange tube is a guide slope 101 inclined from one side to the opposite side, the end of the guide slope 101 away from the heat exchange tube is designed to have a penetrating tip. Therefore, the penetrating tip can still penetrate out of the coaxial penetrating hole in front after the tube end of the heat exchange tube sags due to gravity, ensuring the accuracy and efficiency of the installation of the heat exchange tube. At the same time, it can also eliminate the error of the coaxiality of the penetrating holes between adjacent baffles, and increase the success rate of the tube penetration. In addition, it should be noted that during the tube penetration process, the worker or mechanical equipment can make the heat exchange tube slide forward while rotating, which can reduce the frictional resistance between the heat exchange tube and the inner wall of the penetrating hole, thereby improving the efficiency of the tube penetration. The guide part 1 and the connecting rod 2 can relatively rotate through the arrangement of the bearing 3. The center of gravity of the guide part 1 is offset through the arrangement of the counterweight 102, so that the posture of the guide part 1 is always in the state that the penetrating tip is on top and the guide slope 101 is on the bottom. During the tube penetration process, as long as the end of the penetrating tip is not lower than the penetrating hole channel, the guide part 1 can penetrate into the penetrating hole under the action of the pushing force, thereby guiding the heat exchange tube to penetrate into the penetrating hole.

[0048] It should be noted that after the guide part 1, the connecting rod 2, the bearing 3 and the heat exchange tube are connected, the cross section of any adjacent connection is the same as the diameter of the penetrating hole, thereby avoiding the clamping between the connection and the edge of the penetrating hole during the tube penetration process.

[0049] As a preferred embodiment of the present application, with reference to Figure 4 and Figure 5 , the drive mechanism for driving the clamping mechanism to clamp the inner wall of the heat exchange tube is further included. The guide part 1 relatively rotates with the connecting rod 2 to drive the drive mechanism to drive the clamping mechanism to clamp the inner wall of the heat exchange tube.

[0050] The arrangement of the drive mechanism facilitates the drive of the clamping mechanism to increase the pressure between the clamping mechanism and the inner wall of the heat exchange tube, and increase the stability of the connection between the connecting rod 2 and the heat exchange tube, thereby avoiding the loosening or falling off of the connection between the connecting rod 2 and the heat exchange tube during the tube penetration process. The clamping mechanism can further increase the positive pressure between the clamping mechanism and the inner wall of the heat exchange tube through the drive mechanism during the rotation of the heat exchange tube, thereby further ensuring the stability of the connection between the connecting rod 2 and the heat exchange tube during the rotation of the heat exchange tube.

[0051] As a specific embodiment of the clamping mechanism in the present application, refer to Figures 3-5 The clamping mechanism comprises a plurality of groups of sliding grooves 4 arranged circumferentially along the connecting rod 2, and a plurality of clamping balls 401 are slidably connected in the sliding grooves 4. The diameter of the clamping ball 401 is the same as the inner diameter of the sliding groove 4, and a spring 402 is fixedly connected between the clamping ball 401 and the inner wall of the sliding groove 4.

[0052] The sliding grooves 4 are arranged in 4-6 groups along the axial direction of the connecting rod 2, and preferably arranged in 6 groups. Two rows of sliding grooves 4 are arranged along the axial direction of the connecting rod 2 to increase the stability of the connection between the connecting rod 2 and the heat exchange pipe. Specifically, when the connecting rod 2 is connected with the heat exchange pipe, the connecting rod 2 is inserted into the heat exchange pipe, and the clamping ball 401 is in contact with the inner wall of the heat exchange pipe under the action of the spring 402. The normal pressure between the clamping ball 401 and the inner wall of the heat exchange pipe increases the stability of the connection between the connecting rod 2 and the heat exchange pipe.

[0053] As a specific embodiment of the driving mechanism in the above embodiment, refer to Figure 4 and Figure 5 The driving mechanism comprises an oil tank 8, and the oil tank 8 is connected with the sliding groove 4 through a oil guiding mechanism. The oil guiding mechanism comprises a oil cylinder 7, and a piston 701 is slidably connected in the oil cylinder 7. A push rod 702 is fixedly connected to the piston 701. An oil inlet pipe 703 is connected between the oil cylinder 7 and the oil tank 8. An oil outlet pipe 704 is connected between the oil cylinder 7 and the sliding groove 4. A one-way valve is arranged on the oil inlet pipe 703 and the oil outlet pipe 704 to allow the oil in the oil tank 8 to flow in one direction through the oil inlet pipe 703, the oil cylinder 7, the oil outlet pipe 704 and the sliding groove 4. The end of the guide part 1 close to the connecting rod 2 is provided with a driving part for driving the piston 701 to slide back and forth.

[0054] When the guide part 1 rotates relative to the connecting rod 2, the driving part drives the piston 701 to slide back and forth in the oil cylinder 7. When the oil cylinder 7 slides towards the push rod 702, the hydraulic oil in the oil tank 8 enters the oil cylinder 7 through the oil inlet pipe 703. When the piston 701 slides away from the push rod 702, the hydraulic oil in the oil cylinder 7 is pressed into the sliding groove 4 through the oil outlet pipe 704. The hydraulic oil in the sliding groove 4 exerts pressure on the clamping ball 401, further increasing the pressure between the clamping ball 401 and the inner wall of the heat exchange pipe, and further ensuring the stability of the connection between the connecting rod 2 and the heat exchange pipe when the guide part 1 rotates relative to the connecting rod 2.

[0055] As a specific embodiment of the driving part in the above embodiment, refer to Figure 5The driving member comprises a driving gear 103 arranged at one end of the guide part 1 close to the connecting rod 2, and the driving gear 103 is coaxially arranged with the guide part 1. The connecting rod 2 is provided with a circular groove 5 at one end close to the guide part 1, and the circular groove 5 is coaxially arranged with the driving gear 103. A rotating shaft 6 is rotatably connected to the inner wall of the circular groove 5, and a driven gear 601 is arranged on the rotating shaft 6. The driven gear 601 is engaged with the driving gear 103. A cam 602 is arranged on the rotating shaft 6 and is slidably connected with a push rod 702.

[0056] When the guide part 1 rotates relative to the connecting rod 2, the driving gear 103 drives the rotating shaft 6 to rotate through the driven gear 601. The cam 602 rotates the rotating shaft 6 and drives the piston 701 to reciprocate in the oil cylinder 7 through the push rod 702, so as to guide the hydraulic oil in the oil cylinder 7 into the sliding groove 4 to pressurize the pressing ball 401.

[0057] As a preferred example of the guide slope 101 in the above embodiment, referring to Figure 3 and Figure 4 , the guide slope 101 is a plane or an arc surface.

[0058] As a preferred embodiment of the guide part 1, referring to Figures 1-4 , the guide part 1 is made of Teflon plastic material. The center of gravity of the counterweight 102 is located at the side of the counterweight 102 away from the perforated tip. The counterweight 102 is a lead block.

[0059] Using Teflon plastic as the manufacturing material of the guide part 1 can improve the service life of the guide part 1. In addition, Teflon plastic is relatively smooth, which is beneficial for the guide part 1 to smoothly pass through the perforated hole. The shape of the counterweight 102 can be designed to gradually increase from bottom to top, so that the center of gravity of the counterweight 102 is biased downward, thereby ensuring that the perforated tip of the guide part 1 is always above, and the guide slope 101 is always below the perforated tip.

[0060] Further, the outer edge of the guide slope 101 is provided with a rounded corner. The setting of the rounded corner facilitates increasing the structural strength of the outer edge of the guide slope 101, avoiding deformation of the guide slope 101 due to collision, and reducing the accuracy of the heat exchange tube perforation.

[0061] As a preferred embodiment of the sliding groove 4, the upper end of the sliding groove 4 is provided with an anti-falling flange. The setting of the anti-falling flange can limit the pressing ball 401, avoiding the pressing ball 401 from falling out of the sliding groove 4.

[0062] As a preferred embodiment of the present application, the sliding groove 4 and the oil tank 8 are connected with an oil return pipeline 801, and the oil return pipeline 801 is provided with a pressure control valve.

[0063] After the heat exchange pipe is inserted, the hydraulic oil in the sliding groove 4 is returned to the oil tank 8 through the opening of the pressure control valve, the pressure in the sliding groove 4 is reduced, the pressure between the pressing ball 401 and the inner wall of the heat exchange pipe is reduced, and the operator can pull out the connecting rod 2 from the heat exchange pipe by using a small pulling force.

[0064] The places not mentioned in the present application can be realized by using or referring to the existing technology.

[0065] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment mainly describes the difference from other embodiments.

[0066] The above only describes the embodiments of the present application and is not used to limit the present application. The present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A guide head for tube insertion of a shell and tube heat exchanger for tube insertion installation of heat exchange tubes in a heat exchanger, characterized in that, The guide head comprises a connecting rod detachably connected with the end port of the heat exchange pipe, a plurality of sets of pressing mechanisms arranged on the side wall of the connecting rod and abutting against the inner wall of the heat exchange pipe, a guide part connected with the end of the connecting rod away from the end port of the heat exchange pipe through a bearing, and an inclined guide surface arranged from one side to the opposite side on the end surface of the guide part away from the heat exchange pipe, wherein the end of the inclined guide surface away from the heat exchange pipe is a perforated tip, and a counterweight is arranged on the side wall of the guide part opposite to the perforated tip so that the center of gravity of the guide part is deviated to the side opposite to the perforated tip. The guide head further comprises a driving mechanism for driving the pressing mechanisms to press against the inner wall of the heat exchange pipe, and the guide part is rotatable relative to the connecting rod so that the driving mechanism drives the pressing mechanisms to press against the inner wall of the heat exchange pipe. The pressing mechanisms comprise a plurality of sets of sliding grooves arranged at intervals in the circumferential direction of the connecting rod, and a pressing ball is slidably connected in the sliding groove, wherein the diameter of the pressing ball is the same as the inner diameter of the sliding groove, and a spring is fixedly connected between the pressing ball and the inner wall of the sliding groove. The driving mechanism comprises an oil tank, and the oil tank is connected with the sliding groove through an oil guide mechanism, wherein the oil guide mechanism comprises an oil cylinder, a piston is slidably connected in the oil cylinder, a push rod is fixedly connected to the piston, an oil inlet pipe is connected between the oil cylinder and the oil tank, an oil outlet pipe is connected between the oil cylinder and the sliding groove, and a one-way valve is arranged on each of the oil inlet pipe and the oil outlet pipe so that the oil in the oil tank flows in one direction along the oil inlet pipe, the oil cylinder, the oil outlet pipe and the sliding groove, and the end of the guide part close to the connecting rod is provided with a driving part for driving the piston to reciprocate. The driving part comprises a driving gear, the driving gear is arranged at the end of the guide part close to the connecting rod, and the driving gear is coaxially arranged with the guide part, the end of the connecting rod close to the guide part is provided with a circular groove, the circular groove is coaxially arranged with the driving gear, a rotating shaft is rotatably connected to the inner wall of the circular groove, a driven gear is arranged on the rotating shaft, the driven gear is engaged with the driving gear, a cam is arranged on the rotating shaft, and the cam is slidably connected with the push rod.

2. A guide head for threading a tube into a shell and tube heat exchanger according to claim 1, wherein, The inclined guide surface is a plane or an arc surface.

3. A guide head for threading a tube into a tube heat exchanger according to claim 2, characterized in that The guide part is made of Teflon plastic material, the center of gravity of the counterweight is located on the side of the counterweight away from the perforated tip, and the counterweight is a lead block.

4. A guide head for threading a tube into a tube heat exchanger according to claim 3, characterized in that The outer edge of the inclined guide surface is provided with a rounded corner.

5. A guide head for threading a tube into a tube-in-tube heat exchanger according to claim 1, wherein, The upper port of the sliding groove is provided with an anti-falling flange.

6. A guide head for threading a tube into a tube-in-tube heat exchanger according to claim 1, wherein, An oil return pipeline is connected between the sliding groove and the oil tank, and a pressure control valve is arranged on the oil return pipeline.

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