JPH11241894A - Method and apparatus for assembling plate heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To tighten as much as twenty stud bolts by single operation. SOLUTION: The method for assembling a plate heat exchanger comprises a step for arranging stud bolts 15 for bringing a gasket into tight contact with a heat exchanging plate, a step for engaging a ratchet spanner 21 to tighten symmetrically arranged stud nuts by turning reversely, a step for turning the engaging parts at once through up/down motion of the forward end part engaged with the forward end of the ratchet spanner 21 and arranging an interlocking metal for tightening the stud nuts at once on the back side of a pressure plate, a step for arranging a hydraulic jack moving the interlocking-metal up and down below the interlocking metal, and a step for turning the ratchet spanner 21 at once through up/down motion of the interlocking metal caused by action of the hydraulic jack 13 and tightening the stud nuts simultaneously to assemble a heat exchanger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in which a cooling medium and a medium to be cooled flow on both sides of a heat exchange plate laminated over a plurality of layers with a gasket interposed therebetween to perform efficient heat exchange. The present invention relates to a plate heat exchanger assembling method and a plate heat exchanger assembling apparatus used in the assembling method.

[0002]

2. Description of the Related Art A plurality of heat exchange plates and gaskets are alternately arranged between a frame plate and a pressure plate having increased rigidity, and a plurality of stud bolts having one end engaged with the frame plate. Are arranged on both sides of the heat exchange plate and the gasket so as to be bilaterally symmetrical and on the outer peripheral edges of the upper and lower central portions, and are protruded rearward from a pressure plate provided opposite to the frame plate. The heat exchange plate and the gasket are brought into close contact with each other by tightening the stud nut screwed into the thread groove provided in the bolt protrusion, and the heat exchange plate is secured by the adjacent gasket. 2. Description of the Related Art A plate heat exchanger in which a cooling medium and a medium to be cooled are caused to flow on both side surfaces to perform heat exchange has conventionally been used.

As shown in FIG. 1, such a plate-type heat exchanger 20 comprises a vertically arranged heat exchange plate 1.
And the gasket 2 are alternately overlapped, and are fastened by stud bolts 5 provided between the thick frame plate 3 and the pressure plate 4 arranged at both ends to assemble.

That is, in assembling the plate heat exchanger 20 having such a configuration, first, as shown in FIG. 1, the head is engaged with both side portions of the outer surface of the frame plate 3 and the outer peripheral edge of the central portion. Through the heat exchange plate 1 and the gasket 2 which are arranged in a stacked state, and are penetrated into recesses provided on the outer peripheral edges of the upper, lower, and central portions, and face the frame plate 3. A large number of stud bolts 5 penetrating through the recesses on the outer peripheral edge of the pressure plate 4
And extends between the frame plate 3 and the pressure plate 4 so as to protrude to the rear of the rear surface of the frame.

The stud bolt 5, particularly, a portion of the stud bolt 5 protruding from the pressure plate 4 is provided with a one-way thread groove. A space for maintenance and inspection such as cleaning of the heat exchange plate 1 and the gasket 2 is provided on the back side of the pressure plate 4, that is, on the right side of the pressure plate 4 in FIG. The length of the stud bolt 5 that protrudes from the back surface of the pressure plate 3 so that the gasket 2 can be moved to this space is set to be sufficiently long to the right side of this space.

Then, the heat exchange plate 1 and the gasket 2 are tightened by the large number of stud bolts 5 and screwed into a thread groove formed in a protruding portion of the stud bolt 5 protruding from the back surface of the pressure plate 4. As shown in FIG. 4, the stud nut 6 provided on the outer peripheral edge of the rear surface of the pressure plate 4 is not shown in FIG. The assembly is completed by tightening so that the interval between the frame plate 3 and the pressure plate 4 has a fixed size while tightening little by little in the order of Nos. 1 to 20.

In FIGS. 3 and 4, reference numeral 7 denotes a frame for reinforcing the plate heat exchanger 10, 8 denotes a frame supporting the frame plate 3 and the pressure plate 4, 9 denotes a presser foot, and 10 denotes a pressure plate. Opened,
A flange provided at an opening for introducing or discharging the medium to be cooled or the cooling medium.

However, the gasket 2 interposed between the heat exchange plates 1 of the plate heat exchanger 20 assembled in this manner and sealing between the adjacent heat exchange plates 1 is made of a rubber-based material. Are mainly used, and the resilience is reduced by aging and operation,
There is a case where the medium to be cooled or the cooling medium flowing on both sides of the heat exchange plate 1 leaks to the other channel or to the outside.

In such a case, the stud nut 6 is retightened, and the interval between the stud bolts 5 installed between the frame plate 3 and the pressure plate 4 is tightened to reduce the leak so as to suppress the leak. ing. As in the case of the above-described assembling, the stud nut 6 is also tightened with an air-driven bolt tightening tool or by manual force so that the heat exchange plate 1 is not particularly deformed. In the order of the numbers listed in
While gradually tightening, tighten the frame plate 3
Up to 1% of the dimension between the pressure plate 4 and the pressure plate 4 to prevent leakage.

However, when the stud bolts 5 are tightened by the conventional method, the number of stud bolts 5 becomes as large as about 20 as shown in FIG. 4, and the plate heat exchanger 10 is large. In this case, the width is 1.2 m and the height is 3 m. Therefore, it is necessary to install a scaffolding for the stud nut 6 for tightening the stud bolt 5 arranged above, and also, it is necessary to mount the scaffold on an unstable scaffold. Since a large number of stud bolts 5 are tightened one by one, one-sided tightening will inevitably occur, which may cause deformation of the heat exchange plate 1 and prevent leakage from being prevented even by retightening. There is concern that this will happen.

In order to tighten the heat exchange plate 1 and the gasket 2 evenly with the twenty stud bolts 5 by tightening the twenty stud nuts 6 little by little, to re-tighten so as not to cause a leak. As in the case of assembling, there is a disadvantage that a skilled instructor is required, and even if a plurality of workers work, a long working time is required.

[0012]

SUMMARY OF THE INVENTION According to the present invention, in order to solve the above-mentioned problems at the time of assembling the conventional plate heat exchanger, one worker does not need to install a scaffold, and
By tightening the stud nut as much as 0 pieces, the stud bolt can be tightened simultaneously with the same tightening allowance, in a short time and easily, and the assembling or re-tightening is ensured so that no leak occurs. An object of the present invention is to provide a method of assembling a plate heat exchanger and an apparatus for assembling the plate heat exchanger.

[0013]

For this reason, the method of assembling the plate heat exchanger of the present invention employs the following means.

(1) One end is engaged with the frame plate, and a plurality of frames are alternately arranged between the frame plate and the pressure plate, and between the frame plate and the pressure plate. A heat exchange plate for performing heat exchange and sealing, a plate-type heat exchanger consisting of a heat exchanger and a gasket are inserted through the outer peripheral edges of both sides and the upper and lower central parts, and are symmetrically arranged, respectively, on the back side of the pressure plate On the other end protruding from the left and right sides, a stud nut is screwed into a thread groove that is screwed in the opposite direction on the left and right sides, and by tightening this stud nut, the gap between the frame plate and the pressure plate is changed, Insert the stud bolt that evenly adheres the heat exchange plate and gasket to the frame plate and press (2) Stud nuts screwed to stud bolts respectively arranged symmetrically are rotated in opposite directions to tighten the left and right stud nuts. An engaging portion provided at the base end of the ratchet spanner so as to rotate in opposite directions on the left and right sides,
A step of engaging each of the stud nuts; (3) a ratchet spanner in which each of the left and right stud nuts is engaged with each of the left and right stud nuts by engaging the tip of the ratchet spanner with the tip of the opposite side of the engagement part. By moving the tip of the ratchet up and down to rotate, the engaging portions of the ratchet spanner
Rotate the left and right sides in opposite directions, rotate the left and right stud nuts engaged with the engagement parts in the opposite direction, and tighten the interlocking bracket that performs simultaneous tightening. (4) a hydraulic jack, in which the operating part is brought into contact with the lower end of the interlocking bracket so that the interlocking bracket can be moved up and down,
(5) Activating the hydraulic jack to move the ratchet wrench up and down, thereby simultaneously rotating the ratchet wrench in the left and right directions in opposite directions. At the same time, all the left and right stud nuts are rotated to tighten them, and between the frame plate and the pressure plate, multiple alternately arranged heat exchange plates and gaskets are brought into close contact to maintain sealing. The step of assembling the plate heat exchanger thus completed, and the apparatus for assembling the plate heat exchanger of the present invention are as follows.

(6) One end is engaged with the frame plate, and a plurality of frames are alternately arranged between the frame plate and the pressure plate, and between the frame plate and the pressure plate. A heat exchange plate that performs heat exchange and sealing, the both sides of the gasket, and the outer peripheral edge of the upper and lower central parts are inserted and arranged symmetrically, respectively, at the other end protruding from the back side of the pressure plate , On the left and right sides,
The stud nut is screwed into the thread groove that is screwed in the opposite direction, and by tightening this stud nut, the gap between the frame plate and the pressure plate is changed, and the heat exchange plate and the gasket are evenly adhered. The stud bolt to be mounted was installed between the frame plate and the pressure plate.

(7) An engaging portion is engaged with a stud nut screwed into each of the stud bolts disposed symmetrically in the left and right directions, and the left and right sides rotate in opposite directions to rotate left and right. Were rotated in opposite directions, and a ratchet spanner was provided so that the left and right stud nuts were simultaneously tightened by the same amount.

(8) The central portion of the pressure plate is disposed in the vertical direction, and is engaged with the distal end of each ratchet spanner opposite to the engaging portion, and engages the ratchet spanner by vertical movement. An interlocking fitting is provided for simultaneously rotating around the joint and simultaneously rotating the left and right stud nuts, which are engaged with the engaging portions of the ratchet spanner, in opposite directions.

(9) A hydraulic jack is provided at the center on the rear side of the pressure plate below the interlocking fitting, and moves up and down the interlocking fitting connected to the upper operating portion by operation.

According to the plate-type heat exchanger assembling method and the plate-type heat exchanger assembling apparatus of the present invention, the interlocking fitting is moved up and down by the hydraulic jack, thereby engaging with the interlocking fitting. The tip of the ratchet spanner moves up and down, engages with the engagement portion of the ratchet spanner, is disposed on the outer peripheral edge of the pressure plate, and is disposed on the left half surface when viewed from the pressure plate rear side. With the left-hand screw specification, the one placed on the right half surface is screwed into the right-hand screw specification stud holt, and the stud nut rotates in the opposite direction on the left and right sides. It is evenly transmitted to the stud nut and, at the same time, can be rotated and tightened by the same number of revolutions.

Therefore, the interval between the frame plate and the pressure plate, on which the stud bolts are bridged, is simultaneously reduced, and a plurality of heat exchange plates and gaskets alternately arranged between the frame plate and the pressure plate are: The outer peripheral edges where the stud bolts are inserted are evenly adhered to each other, and (1) one worker can easily assemble a plate heat exchanger with excellent sealing properties in a short time. (2) In addition, when assembling or tightening, scaffolding is not required, and work at heights for assembling and tightening is eliminated.
(3) Further, by uniformly tightening all the stud bolts, it is possible to prevent deformation of the heat exchange plate due to one-sided tightening, and to prevent the plate heat exchanger from causing a long-term leak. Can be.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the plate heat exchanger assembling apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the entire plate type heat exchanger to be assembled by the assembling method or the assembling apparatus of the present invention. FIG. 2 is a rear view of a pressure plate taken along the line AA in FIG. FIG. 3 shows a state in which the first embodiment of the plate heat exchanger assembling apparatus of the present invention is mounted.
FIG. 2 is a rear view of the pressure plate taken along the line AA in FIG. 1, and is a view showing a state in which the assembly device of the plate heat exchanger of the present embodiment is removed. The same or similar members as those described in “Prior Art” are assigned the same reference numerals and detailed description thereof will be omitted.

As shown in the figure, the plate heat exchanger 20
And a stud bolt 15 for connecting and integrating the frame plate 3, the heat exchange plate 1, the gasket 2 and the pressure plate 14 having the same structure as the conventional one.
In the same manner as in the prior art, the plate heat exchanger 20 has four plates at the upper and lower sides of the plate heat exchanger 20 and four at the center and the lower left and right sides of the plate heat exchanger 20 in total. Is formed between the frame plate 3 and the pressure plate 14 through a groove formed in the outer peripheral edge of the frame.

That is, as shown in FIG. 3, the center of the plate-type heat exchanger 20 in the width direction is 1
The stud bolts 15 are arranged one by one, and by tightening the stud bolts 15, the plate heat exchanger 2
The heat exchange plates 1 and the gaskets 2 which are alternately arranged between the frame plate 3 and the pressure plate 14 are brought into close contact with each other by tightening the outer peripheral edge of the seal plate 0 to maintain the sealing property.

Further, it is necessary that all the stud bolts 15 be uniformly tightened so that a one-sided tightening does not occur when the stud bolts 15 are tightened. Therefore, a stud nut 16 screwed to each of the stud bolts 15 is used. 2 can be simultaneously tightened by a ratchet spanner 21 supported by a pin 19 provided on the assembling apparatus 11 shown in FIG.

The ratchet spanner 21 is disposed on the right outside of the plate heat exchanger 20 as a right-screw ratchet spanner 21a, and disposed on the left outside as a left-screw ratchet spanner 21b. The right end of the Y-shaped arm 18a and the inverted Y-shaped 18b of the metal fitting 17 is a left-handed ratchet spanner 21b, and the left-hand side is a right-handed ratchet spanner 21a. The portion 23 is rotatably attached to the pin 19 of the interlocking bracket 17. A hydraulic jack 13 is provided at the lower end of the interlocking bracket 17.
The hydraulic jack 13 is fixed to the back surface of the pressure plate 4.

Thus, the interlocking bracket 17 can be moved up and down following the up and down movement of the hydraulic jack 13, and the up and down movement of the interlocking bracket 17 causes the ratchet spanner 21 to move.
The ratchet spanner 21 rotates around the engaging portion 22 engaged with the stud nut 16 by rotating the tip end 22 of the stud nut 16 up and down, and rotates the stud nut 16 in the direction specified by the specification. The stud bolt 15 can be tightened by moving.

That is, the hydraulic jack 13 and the interlocking bracket 17 are attached to the back side of the pressure plate 4 from which the stud bolt 15 protrudes from the back side, and the stud nut 1 in which the engaging portion 22 of the ratchet spanner 21 is screwed to 15.
6 and the ratchet spanner tip 2
3 is pivotally connected to the interlocking bracket 17, so that the hydraulic jack 13
Is transmitted from the interlocking bracket 17 to the ratchet spanner 21 to facilitate simultaneous tightening of the heat exchange plate 1 and the gasket 25, which are arranged alternately and plurally, by the stud bolts 15.
The zero stud nuts 16 are simultaneously rotated in the tightening direction to tighten.

For this purpose, the stud bolt 15 is disposed on the rear side of the pressure plate 14, that is, on the right outside as viewed from the direction of arrow AA shown in FIG. 15a, and those arranged on the left outside are stud bolts 15 with left-hand thread specifications.
b. However, the stud bolts 15 arranged at the center of the upper and lower portions of the plate heat exchanger 20 are arranged on the right side in the structure of the interlocking bracket 8, and are arranged on the left side with the left-hand threaded stud bolts 15b. Is a screw specification of a stud bolt opposite to the right screw specification stud bolt 15a.

The arrangement of these stud screws 15 for each screw specification is as shown in FIG. Therefore, the stud nut 16 which is screwed to these stud screws 15 and tightens the stud screw 15 is the one which is screwed to the right screw specification stud bolt 15a. The right screw specification stud 16a which tightens the stud screw 15 by clockwise rotation. The screw threaded to the left-handed stud bolt 15b is a left-handed stud 16b for tightening the stud screw 15 by rotating counterclockwise.

The assembling apparatus 11 for rotating the stud nut 16 and tightening the stud bolt 15 includes an interlocking bracket 17 for vertically moving the back side of a presser foot 12 provided at the center of the backside of the pressure plate 14, and an interlocking bracket 17. The oil jack 13 which is installed below and moves the interlocking fitting 17 up and down by the expansion and contraction of the rod, and the stud nut 16 engaged with the engaging portion by the up and down movement of the interlocking fitting 17 is rotated clockwise or counterclockwise. It consists of a ratchet spanner 21.

The interlocking member 17 has a connecting portion with the hydraulic jack 13 at the lower end, and a Y-shaped arm 18a and an inverted Y-shaped arm 18b from the upper and lower ends.
And ratchet spanner 2 through pin 19 and the like.
One tip 23 is rotatably mounted. The ratchet spanner 21a is rotatably connected to the connection fitting 17 by the pin 19 as described above, and has an engagement portion 22 that engages with the right-thread stud nut 16a. And a left-handed ratchet spanner 21b provided with an engaging portion 22 for engaging with the left-handed stud nut 16b, and the stud bolt 15 having the same height is provided with the same pin 19 provided at the same position. To be engaged.

As described above, the assembling apparatus 11 of the present embodiment is
According to the conventional method, the assembly or retightening of the plate heat exchanger 20 is conventionally performed, for example, by gradually tightening 20 stud bolts several times with an air-driven tightening tool or
What was done by a plurality of workers for a long time by human power, only one worker actuated a hydraulic jack 13 such as an electric motor mounted on the pressure plate 4, and 20 stud bolts were simultaneously attached. Tightening can be performed with the same tightening margin to prevent deformation of the plate due to one-sided tightening, and work can be performed in a short time.

[0033]

As described above, the assembling method of the plate heat exchanger according to the present invention is as follows. (1) One end is engaged with the frame plate, and the frame plate, the pressure plate, the heat exchange plate, and Both sides of the gasket, symmetrically disposed on the outer peripheral edge of the upper and lower central part, screwed into the screw groove, which is screwed in the opposite direction on the left and right sides, on the other end protruding from the back side of the pressure plate The process of arranging the stud bolts that make the heat exchange plate and the gasket adhere to each other by tightening the stud nuts, and turning the symmetrically arranged stud nuts in the opposite direction to tighten them by using a ratchet spanner A step of engaging the provided engaging portion with each of the stud nuts, engaging the tip of the ratchet spanner to raise the tip of the ratchet spanner; Arranging the interlocking fitting that simultaneously rotates the engaging part and simultaneously tightening the stud nut on the back side of the pressure plate, and moving the hydraulic jack that moves the interlocking fitting up and down below the interlocking fitting. The hydraulic jack is operated, the ratchet spanner is simultaneously rotated by the vertical movement of the interlocking bracket, and at the same time, the stud nuts are tightened, and the heat exchange plates and gaskets are alternately arranged. And a step of assembling the heat exchanger in which the sealability is maintained by bringing the heat exchanger into close contact.

Further, in the assembling apparatus used in the method of assembling the plate heat exchanger of the present invention, one end is engaged with the frame plate, and the frame plate, the pressure plate, the heat exchange plate, both sides of the gasket, The other end protruding from the back side of the pressure plate is disposed symmetrically on the outer peripheral edge of the central portion, and the other end protruding from the back side of the pressure plate is tightened with a stud nut screwed into a screw groove screwed in the opposite direction on the left and right sides, Stud bolts for bringing the heat exchange plate and gasket into close contact with each other, and the engaging parts are engaged with the stud nuts arranged symmetrically to the left and right, and the left and right stud nuts are rotated in the opposite direction by the rotation of the engaging parts. Let me, at the same time,
A ratchet spanner that is tightened by the same amount is disposed at the center of the pressure plate, and is engaged with the tip of each ratchet spanner. An interlocking fitting that simultaneously tightens the combined left and right stud nuts, and a hydraulic jack that is disposed below the interlocking fitting and moves up and down the interlocking fitting that abuts upward by operation are provided.

As described above, when the interlocking fitting is moved up and down by the hydraulic jack, the tip end of the ratchet spanner engaged with the interlocking fitting is moved up and down, and is engaged with the engaging portion. Those arranged on the outer peripheral edge and arranged on the left half surface as viewed from the back of the pressure plate were, for example, left-hand screw specifications, and those arranged on the right half surface were screwed into stud bolts having right-hand screw specifications. By rotating the stud nuts in opposite directions on the left and right sides, the force of the hydraulic jack is evenly transmitted to all the stud nuts, and at the same time, the same number of rotations can be applied to rotate the stud nuts. The distance between the frame plate and the pressure plate is reduced at the same time, and multiple heat plates are alternately arranged between the frame plate and the pressure plate. The changeover plate and the gasket will be evenly contact the outer peripheral edge stud bolt is inserted.

As described above, a plate type heat exchanger having excellent sealing properties can be easily (1) assembled by one worker in a short time. (2) In addition, scaffolding is not required for assembling or retightening, and work at heights for assembling and retightening is eliminated. (3) Further, since all the stud bolts are uniformly tightened, it is possible to prevent the heat exchange plate from being deformed due to the one-sided tightening, and it is possible to prevent the plate type heat exchanger from leaking for a long time. .

[Brief description of the drawings]

FIG. 1 is a side view showing an entire plate heat exchanger assembled by an assembling method or an assembling apparatus of the present invention;

FIG. 2 is a rear view of the pressure plate taken along the line AA in FIG. 1, showing a state in which the first embodiment of the plate heat exchanger assembling apparatus according to the present invention is mounted.
(A) is an overall rear view, and (b) of FIG.
FIG. 2C is a detailed view of a part B shown in FIG.

FIG. 3 is a rear view of the pressure plate taken along the line AA in FIG. 1, showing a state where an assembling apparatus used for assembling the plate heat exchanger of the present embodiment has been removed;

FIG. 4 is a rear view of a pressure plate showing an assembling method of a conventional plate heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchange plate 2 Gasket 3 Frame plate 4 Pressure plate 5 Stud bolt 6 Stud nut 7 Frame 8 Frame 9 Presser foot 10 Flange 11 Assembly device 12 Presser foot 13 Hydraulic jack 14 Pressure plate 15 Stud bolt 15a Right screw stud bolt 15b Left threaded stud bolt 16 Stud nut 16a Right threaded stud nut 16b Left threaded stud nut 17 Interlocking bracket 18 Arm 18a Y-shaped arm 18b Reverse Y-shaped arm 19 Pin 20 Plate heat exchanger 21 Ratchet spanner 21a Right screw Specification Ratchet spanner 21b Left-hand screw specification ratchet spanner 22 Engagement part 23 Tip

Claims (2)

[Claims] 1. A plurality of heat exchange plates and gaskets are alternately arranged between a frame plate and a pressure plate provided at both ends, and a plurality of heat exchange plates and gaskets are arranged between fluids flowing on both sides of the adjacent heat exchange plates. In the method for assembling a plate-type heat exchanger that performs heat exchange, one end is engaged with the frame plate, and the plate-type heat exchanger is disposed symmetrically through an outer peripheral edge thereof, A stud nut which is screwed into a thread groove which is screwed in the left and right opposite direction to the other end protruding from the pressure plate, and which tightly adheres the heat exchange plate and the gasket by tightening the stud nut. Arranging between the frame plate and the pressure plate; and Engaging the ratchet wrench to rotate the respective ratchet wrench in the opposite direction, and engaging the tip of the ratchet wrench to rotate the ratchet wrench arranged on the left and right simultaneously in the opposite direction by up and down movement. Disposing the interlocking fitting at the center of the pressure plate, disposing the hydraulic jack for moving the interlocking fitting up and down below the interlocking fitting, and actuating the hydraulic jack through the interlocking fitting. Rotating the ratchet spanner at the same time and simultaneously rotating the left and right stud nuts in opposite directions to assemble the tightening heat exchanger. Method. 2. A heat exchange plate and a plurality of gaskets are alternately arranged between a frame plate and a pressure plate disposed at both ends, and a plurality of heat exchange plates and gaskets are arranged between fluids flowing on both sides of the adjacent heat exchange plate. In a plate heat exchanger assembling apparatus that performs heat exchange, one end is engaged with the frame plate, and the plate heat exchanger is disposed symmetrically through an outer peripheral edge of the plate heat exchanger. On the other end protruding from the pressure plate, a stud nut is screwed into a thread groove screwed in the left and right opposite direction, and is bridged between the frame plate and the pressure plate. A stud bolt for evenly contacting the heat exchange plate and the gasket, and the stud nut is engaged with each of the stud nuts. A ratchet spanner to be rotated, an interlocking fitting disposed at a central portion of the pressure plate, which is engaged with a tip end of the ratcheting spanner, and simultaneously rotates the ratchet spanner by vertical movement, and a lower portion of the interlocking bracket. And a hydraulic jack for moving the interlocking fitting up and down.