CN215431201U

CN215431201U - Body expander transmission mechanism for thick-wall tube heat exchanger

Info

Publication number: CN215431201U
Application number: CN202121069923.4U
Authority: CN
Inventors: 郭兆洲; 马明; 张萌; 佟立伟
Original assignee: Dalian Tongtie Thermal Power Co ltd
Current assignee: Dalian Tongtie Thermal Power Co ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2022-01-07
Anticipated expiration: 2031-05-19

Abstract

The utility model provides a body expander transmission mechanism for a thick-wall tube heat exchanger, which comprises four groups of gear sets, wherein each group of gear sets has the same structure and consists of two outer gears and an inner gear, each group of gear sets is connected through a gear shaft, the gear shaft is a stepped shaft, a key groove is processed in the middle part of the gear shaft, the diameter difference of the outer gears and the inner gear is the diameter of a rack body expanding rod, the rack body expanding rod is clamped between the two groups of gear sets which are meshed up and down, external power is input to the inner gear of a driving gear group through the gear shaft to drive the rack body expanding rod to do linear motion, a thrust bearing is arranged on an outer gear shaft of the outer gears, two shaft fixing plates are respectively arranged on two outer sides of the gear sets, 4 deep groove ball bearings are arranged on the shaft fixing plates, and an elastic check ring for mounting the shaft is arranged at the upper end parts of the deep groove ball bearings. The utility model has simple structure, can provide sufficient expansion thrust for the expansion of the thick-wall tube heat exchanger, improves the production efficiency, reduces the labor intensity of operators and saves the production cost.

Description

Body expander transmission mechanism for thick-wall tube heat exchanger

Technical Field

The utility model belongs to the technical field of heat exchanger core expansion joint processing tools, and particularly relates to a transmission mechanism of an expansion machine for a thick-wall tube heat exchanger.

Background

The heat exchanger with thicker wall of the water pipe is called thick-wall pipe heat exchanger for short. The core body is expanded and connected, called body expansion for short. The thick-wall tube heat exchanger has the advantages of corrosion resistance and high strength; in the manufacturing process, the thick-wall pipe and the fins need to be expanded to meet the requirement of heat exchange performance, namely, the thick-wall pipe and the fins are in clearance fit before expansion, and the thick-wall pipe and the fins achieve interference fit after expansion so as to eliminate air thermal resistance. The thick-wall pipe has much increased pipe wall thickness compared with the common pipe, and needs larger expansion power; the transmission mechanism of the common equipment provides expansion power through friction force, and the power is insufficient for thick-wall pipes. It is necessary to design a transmission mechanism capable of providing enough power for the expansion of the thick-wall tube heat exchanger according to the design requirements of the product.

Disclosure of Invention

The utility model aims to solve the technical problems of providing a body expansion machine transmission mechanism for a thick-wall tube heat exchanger, and solving the problems of insufficient body expansion power, low production efficiency and high labor intensity of operators.

The technical scheme adopted by the utility model is as follows: a body expander transmission mechanism for a thick-wall tube heat exchanger comprises four gear sets, namely a driving gear set, a driven gear set, an upper guide gear set and a lower guide gear set, wherein the driving gear set and the driven gear set are meshed up and down, the upper guide gear set and the lower guide gear set are meshed up and down, each gear set is identical in structure and comprises two outer gears and an inner gear, each gear set is connected with a gear shaft through a key, the gear shaft is a stepped shaft, a key groove is processed in the middle of the gear shaft, the diameter of the inner gear is smaller than that of the outer gear, the diameter difference of the outer gear and the inner gear is the diameter of a rack body expansion rod, the rack body expansion rod is clamped between the two gear sets which are meshed up and down, external power is input into the inner gear of the driving gear set through the gear shaft, the rack body expansion rod is driven to do linear motion, and a thrust bearing is installed on the outer gear shaft of the outer gear, and two shaft fixing plates are respectively arranged on two sides of the outer part of the gear set, 4 deep groove ball bearings are arranged on the shaft fixing plates, and the gear shaft is arranged on an elastic check ring for mounting the shaft on the upper end parts of the deep groove ball bearings.

Preferably, the external power is a hydraulic motor, and the external power controls the gear shaft to rotate forwards or backwards.

Preferably, the major diameter of the gear shaft is equal to the gear bore diameter of the outer gear and the inner gear, and the minor diameter of the gear shaft is matched with the deep groove ball bearing.

Preferably, the cross section of the rack body expansion rod is circular, a rack structure is processed on the rod body of the rack body expansion rod, rack parameters correspond to those of an inner gear of the gear set, and the end part of the rack body expansion rod is fixed with the connector expansion head through a screw.

The utility model has the beneficial effects that: the utility model has simple structure, convenient use and adjustment, time and labor saving; for the body expansion of the thick-wall tube heat exchanger, sufficient body expansion thrust can be provided, the body expansion process of the product is realized, the production efficiency is improved, the labor intensity of an operator is reduced, and the production cost is saved.

Drawings

FIG. 1 is a schematic structural view of a bulking machine transmission mechanism for a thick-wall tube heat exchanger;

FIG. 2 is a top view of the expander transmission for a thick-walled tube heat exchanger;

FIG. 3 is a schematic diagram of the use of the expander transmission mechanism for a thick-walled tube heat exchanger.

Reference numerals: 1-driving gear set 2-driven gear set 3-upper guide gear set 4-lower guide gear set 5-gear shaft 6-rack body expanding rod 7-external gear 8-internal gear 9-shaft fixing plate 10-thrust bearing 11-deep groove ball bearing 12-elastic retainer ring for shaft 13-body expanding head 14-thick-wall pipe

Detailed Description

The utility model is further explained below with reference to the drawings.

As shown in fig. 1, the transmission mechanism of the expansion machine for the thick-wall tube heat exchanger comprises four gear sets, four gear shafts 5, a rack expansion rod 6, a shaft fixing plate 9, a bearing, an elastic collar 12 for the shaft and the like. Four groups of gear sets are respectively a driving gear set 1, a driven gear set 2, an upper guide gear set 3 and a lower guide gear set 4, the driving gear set 1 is vertically meshed with the driven gear set 2, the upper guide gear set 3 is vertically meshed with the lower guide gear set 4, the four groups of gear sets are identical in structure, as shown in figure 2, each group of gear sets is composed of two outer gears 7 and an inner gear 8, corresponding key grooves are machined, each group of gear sets is connected with a gear shaft 5 through keys, the diameter of the inner gear 8 is smaller than that of the outer gear 7, the diameter difference between the inner gear 8 and the outer gear 7 is just the diameter of a rack expansion rod 6, and the rack expansion rod 6 is clamped between the two groups of gear sets which are vertically meshed. External power (such as a hydraulic motor) is input into an inner gear 8 of the driving gear set 1 through a gear shaft 5 to drive a rack body expansion rod 6 to do linear motion; the rack body expansion rod 6 moves forwards or backwards through the forward rotation or the reverse rotation of the external power. The gear shaft 5 is a stepped shaft, a key groove is processed in the middle, the major diameter of the gear shaft 5 is consistent with the diameters of the gear inner holes of the outer gear 7 and the inner gear 8, and the gear shaft is locked through a key; a thrust bearing 10 is arranged outside the outer gear 7, so that the side surface of the gear is prevented from being abraded; two outer sides of the gear set are respectively provided with a

shaft fixing plate

9, 4 deep groove ball bearings 11 are mounted on the shaft fixing plates 9, the small diameter of the gear shaft 5 is matched with the deep groove ball bearings 11, and two ends of the gear shaft 5 are provided with retainer ring grooves for mounting elastic retainer rings 12 for fixing components. As shown in fig. 3, the cross section of the rack expansion rod 6 is circular, and a rack structure is processed, and the rack parameters correspond to the internal gear 8 of the gear set. The end part of the rack body expansion rod 6 can be directly processed into a shape suitable for body expansion of a thick-wall pipe 14, and the end part of the rack body expansion rod 6 can be fixed with the connector expansion head 13 through a screw. Therefore, when the body expansion head 13 is worn, the new body expansion head 13 is replaced, so that the production cost can be saved, and the production efficiency is improved.

During the use, connect each subassembly earlier fixedly, with the body expand head 13 with thick wall pipe 14 alignment, start external power device, thereby gear shaft 5 drives driving gear group 1 and rotates and drive rack body expander rod 6 and the motion of body expand head 13, goes up guide gear group 3 and lower guide gear group 4 and keeps rack body expander rod 6 and the body expand head 13 along linear motion, can carry out the body to thick wall pipe 14 and expand.

The above-described embodiments of the present invention and the technical principles thereof are intended to be included within the scope of the present invention by any modification and equivalent transformation based on the technical solutions of the present invention.

Claims

1. The utility model provides a body expander drive mechanism for thick-walled tube heat exchanger which characterized in that: including four group's gear trains, be driving gear group (1), driven gear train (2) respectively, go up direction gear train (3) and direction gear train (4) down, meshing from top to bottom of driving gear group (1) and driven gear train (2), go up direction gear train (3) and mesh from top to bottom down direction gear train (4), every group gear train structure is the same, comprises two external gear (7) and an internal gear (8), and every group gear train passes through the key and is connected with a gear shaft (5), gear shaft (5) are the step shaft, and middle part processing has the keyway, and internal gear (8) diameter is less than external gear (7) diameter, and the diameter difference of external gear (7) and internal gear (8) is rack body expander rod (6) diameter, rack body expander rod (6) clamp is between two sets of meshing from top to bottom, passes through gear shaft (5) by external power and inputs internal gear (8) of driving gear group (1), the gear rack body expansion rod (6) is driven to do linear motion, a thrust bearing (10) is installed on an outer gear shaft (5) of an outer gear (7), shaft fixing plates (9) are respectively arranged on two sides of the outer portion of the gear set, 4 deep groove ball bearings (11) are installed on the shaft fixing plates (9), and an elastic check ring (12) for installing the shaft is installed at the upper end portion of each deep groove ball bearing (11) through the gear shaft (5).

2. The expander transmission mechanism for thick-walled tube heat exchangers according to claim 1, wherein: the external power is a hydraulic motor, and the external power controls the forward rotation or the reverse rotation of the gear shaft (5).

3. The expander transmission mechanism for thick-walled tube heat exchangers according to claim 1, wherein: the large diameter of the gear shaft (5) is equal to the gear aperture of the outer gear (7) and the inner gear (8), and the small diameter of the gear shaft (5) is matched with the deep groove ball bearing (11).

4. The expander transmission mechanism for thick-walled tube heat exchangers according to claim 1, wherein: the cross section of the rack body expansion rod (6) is circular, a rack structure is processed on the rod body of the rack body expansion rod (6), rack parameters correspond to those of an internal gear (8) of the gear set, and the end part of the rack body expansion rod (6) is fixed with a connector expansion head (13) through a screw.