Switching transition device for outgoing line sleeve delivery test

Abstract

The utility model provides a switching transition device for outgoing line sleeve delivery test, comprising a conical cylinder, the bottom of the conical cylinder is connected with a basin-type insulating seat, the bottom of the basin-type insulating seat is provided with a connecting groove, an electric connection assembly is installed in the connecting groove, and the top of the electric connection assembly is fixedly connected with a switching transition conductor. The switching transition conductor is located in the basin-type insulating seat, the top of the switching transition conductor is inserted with a to-be-detected wire outlet sleeve, and the to-be-detected wire outlet sleeve is fixedly connected with the conical barrel; a high-voltage leading-in end base is connected to the position, located at the bottom of the basin-type insulating base, of the electric connecting assembly and connected with a bus of the transformer. According to the switching transition device, one end of the switching transition conductor is fixed, and the other end of the switching transition conductor is movably connected, so that the switching transition conductor is prevented from shaking in a test process, the stability of an electric field around the switching transition conductor is ensured, the data deviation obtained by detection is reduced, and the condition of detection failure is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of outgoing line bushing detection, specifically belongs to a kind of outgoing line bushing delivery test switching transition device. BACKGROUND

[0002] Outgoing line bushing is important insulation component in power system, as the incoming line and outgoing line part of GIS switch, play very important role, outgoing line bushing is mainly used to separate the high voltage part of overhead bus and shell, so its delivery test is the key step to ensure the safe operation of power equipment.In the test link of GIS outgoing line bushing, there are great differences in the installation size of outgoing line bushing from different host manufacturers to the plug-in mode of conducting rod, generally speaking, the delivery test tool of each host manufacturer is provided by host manufacturer or is processed according to the drawing provided by host manufacturer, and there is no interchangeability, and with the increase of the number of host manufacturers, the different sizes of outgoing line bushing bring great pressure to the detection of outgoing line bushing manufacturers, that is, corresponding detection tool for different sizes of outgoing line bushing needs to be purchased for one-to-one detection.

[0003] At present, in the detection work, the transition connecting piece is connected in the connection of the conductor and the bus in outgoing line bushing, and the connection of the transition connecting piece with the conductor and the bus is connected by plug-in mode, that is, the conductor and the transition connecting piece, the bus and the transition connecting piece are all movably connected, so that the conductor is easy to shake in the detection process, and then the electric field around the transition connecting piece changes, resulting in large deviation of detected data and easy detection failure. UTILITY MODEL CONTENTS

[0004] In order to solve the problem that the conductor and the bus are connected with the transition connecting piece by plug-in mode in the detection process of existing outgoing line bushing, the conductor is easy to shake in the detection process, resulting in large deviation of detected data and detection failure, the utility model provides a kind of outgoing line bushing delivery test switching transition device.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] The utility model provides a kind of outgoing line bushing delivery test switching transition device, including conical cylinder, the bottom of the conical cylinder is connected with basin type insulator seat, the bottom of the basin type insulator seat is provided with connecting groove, electric connection assembly is installed in the connecting groove, the top of the electric connection assembly is fixedly connected with switching transition conductor, the switching transition conductor is located in the basin type insulator seat, the top of the switching transition conductor is inserted into the outgoing line bushing to be detected, the outgoing line bushing to be detected is fixedly connected with the conical cylinder;

[0007] The high-voltage lead-in end seat is connected to the bottom of the basin-shaped insulating seat of the electric connection assembly, and the high-voltage lead-in end seat is connected to the busbar of the transformer.

[0008] Preferably, the bottom of the basin-shaped insulating seat is provided with an insulating assembly, the insulating assembly comprises a busbar cylinder, the top of the busbar cylinder is arranged on the outer wall of the basin-shaped insulating seat, the high-voltage lead-in end seat is arranged in the busbar cylinder, and one end of the busbar cylinder is fixed to the transformer; a sealing cover is arranged on the other end of the busbar cylinder.

[0009] The outer wall of the conical cylinder is provided with a gas conveying pipe, and the gas conveying pipe is connected with a gas pump; the gas pump is used for conveying insulating gas into the conical cylinder and pumping air out of the conical cylinder.

[0010] The inner wall of the basin-shaped insulating seat is provided with a ventilation hole, and the ventilation hole communicates the internal space of the basin-shaped insulating seat with the internal space of the busbar cylinder.

[0011] Preferably, the pressure of the insulating gas is 0.3MPa ~0.5MPa.

[0012] Preferably, the insulating gas is one or more of sulfur hexafluoride, sulfur tetrafluoride and trifluoroiodomethane.

[0013] Preferably, a second mounting groove is arranged on the top end surface of the adapter transition conductor, and the bottom of the second mounting groove is in communication with the cavity of the adapter transition conductor.

[0014] A spring groove is arranged in the second mounting groove, and a spring is arranged in the spring groove; the to-be-detected outgoing line sleeve is inserted into the spring from the top of the adapter transition conductor.

[0015] The bottom of the adapter transition conductor is provided with a first mounting groove, and the electric connection assembly is connected in the first mounting groove.

[0016] Preferably, a transition flange is connected to the top of the conical cylinder, and the top of the transition flange is connected to the to-be-detected outgoing line sleeve through a connecting piece.

[0017] Preferably, the to-be-detected outgoing line sleeve comprises a conductive rod and a porcelain sleeve, the conductive rod is inserted into the porcelain sleeve, and one end of the conductive rod is inserted into the top of the adapter transition conductor.

[0018] The connecting piece is arranged on the porcelain sleeve.

[0019] A grounding shield wire is arranged between the conductive rod and the porcelain sleeve, and the grounding shield wire is fixed to the transition flange.

[0020] Preferably, the connecting piece is a fixed flange, which is sleeved on the porcelain sleeve and connected with the porcelain sleeve through threads, and the fixed flange is fixed on the transition flange through bolts.

[0021] Preferably, a sealing gasket is arranged between the transition flange and the fixed flange.

[0022] Preferably, the electric connection assembly comprises a transition pad and a fixed block, the fixed block is embedded in the bottom of the basin-type insulating seat, the top of the fixed block is sleeved in the first mounting groove, and the bottom of the transition pad is mounted on the top of the fixed block.

[0023] Compared with the prior art, the utility model has the following beneficial technical effects:

[0024] The utility model discloses a transition device for outgoing line bushing factory test, and the outgoing line bushing to be detected is fixed on the transformer through the conical cylinder and the transition conductor, the transition conductor is fixed through one end and movably connected through the other end, the stability of the electric field around the transition conductor is ensured, the data deviation obtained in detection is reduced, the detection failure is avoided, and the detection efficiency is improved.

[0025] Further, the device ensures the safety isolation of the high-voltage lead-in end seat through the bus cylinder and the basin-type insulating seat, realizes the stable connection with the transformer, effectively prevents the occurrence of electrical breakdown and leakage current, enhances the overall insulation strength of the system, forms a closed space through the bus cylinder, the conical cylinder and the basin-type insulating seat, then fills the conical cylinder with insulation gas through the air pump, provides a stable insulation environment for the conical cylinder and the connected insulation area, reduces the insulation performance decline problem caused by the existence of air, simplifies the complexity of the insulation structure, improves the overall efficiency and stability of the insulation, and provides a powerful guarantee for the safe and efficient operation of the power system.

[0026] Further, the device is provided with a second mounting groove and a spring groove on the transition conductor, which provides a stable and flexible access point for the line sleeve to be detected, and the spring groove can automatically adapt to and compensate for the slight size difference in the insertion process through the elastic effect of the spring, thereby reducing the installation difficulty, improving the work efficiency, realizing the tight covering and good contact of the line sleeve, effectively preventing the poor contact problem caused by looseness or vibration, improving the stability and safety of power transmission, and the elasticity of the spring can also absorb and relieve the thermal expansion and cold shrink effect caused by current change to a certain extent, thereby prolonging the service life of the equipment; the tight connection of the first mounting groove and the electrical connection assembly ensures the reliable connection of the transition conductor and the power system, provides a solid foundation for smooth transmission of current, and also enhances the overall structural strength of the system, thereby providing a strong guarantee for the stable operation of the power system. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A cross-sectional view of a transition device for outgoing line sleeve factory test is provided for the utility model;

[0028] Figure 2 A cross-sectional structure diagram of a connecting conductor in a transition device for outgoing line sleeve factory test is provided for the utility model;

[0029] Figure 3 A cross-sectional structure diagram of a transition pad in a transition device for outgoing line sleeve factory test is provided for the utility model;

[0030] Figure 4 A top view structure diagram of a transition pad in a transition device for outgoing line sleeve factory test is provided for the utility model;

[0031] Figure 5 A cross-sectional structure diagram of a tapered cylinder in a transition device for outgoing line sleeve factory test is provided for the utility model;

[0032] In the drawings: 1, porcelain sleeve; 2, grounding shield wire; 3, conductive rod; 4, transition flange; 5, tapered cylinder; 50, gas pipe; 6, transition conductor; 60, spring groove; 61, first mounting groove; 62, second mounting groove; 7, transition pad; 8, fixed block; 9, basin type insulating seat; 10, high voltage lead-in end seat; 11, busbar cylinder; 12, fixed flange; 13, sealing cover; 14, spring. DETAILED DESCRIPTION

[0033] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different manners without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0034] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0036] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection, or communication; it can be directly connected, or indirectly connected through intermediate medium, or the communication between 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.

[0037] In the present application, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0038] The embodiments of the utility model will be described below in detail with reference to the drawings.

[0039] The utility model proposes a kind of outlet bushing factory test switching transition device, as Figures 1-5 As shown in the drawing, switching transition device includes conical cylinder 5, the bottom end surface of conical cylinder 5 is connected with basin type insulating seat 9, the bottom end surface of basin type insulating seat 9 is provided with connecting groove at its central position, electric connection assembly is installed in connecting groove, the top of electric connection assembly is fixedly connected with switching transition conductor 6, switching transition conductor 6 is located in basin type insulating seat 9, and switching transition conductor 6 is installed vertically in basin type insulating seat 9, and the top end of switching transition conductor 6 is inserted with the out line bushing to be detected, and the out line bushing to be detected is fixedly connected with the top end of conical cylinder 5 electric connection assembly, high voltage lead-in end seat 10 is connected to the position of the bottom of basin type insulating seat 9 on electric connection assembly, high voltage lead-in end seat 10 is L-shaped structure, one end of high voltage lead-in end seat 10 is connected with the busbar of transformer, and the other end of high voltage lead-in end seat 10 is fixed, and the out line bushing to be detected is fixed on transformer by the cooperation of conical cylinder 5 and switching transition conductor 6, and one end of switching transition conductor 6 is inserted with the out line bushing to be detected, and the other end is fixedly connected with the busbar of transformer through electric connection assembly, that is, by one end fixed, the other end is movably connected, avoid switching transition conductor 6 from shaking during factory detection, ensure that the electric field around switching transition conductor 6 does not change during detection, reduce the data deviation obtained by detection, and avoid the occurrence of detection failure, improve detection efficiency.

[0040] As Figure 1 As shown in the drawing, the bottom of basin type insulating seat 9 is provided with insulating assembly, and the insulating assembly includes busbar cylinder 11, and the busbar cylinder 11 is three-way structure, wherein, the outer wall of basin type insulating seat 9 is provided with connecting table near its top end, and the top end of busbar cylinder 11 is fixedly connected with the connecting table by bolt, so that the busbar cylinder 11 is stably fixed on the basin type insulating seat 9, and rubber pad is arranged between the top end of busbar cylinder 11 and the bottom end surface of connecting table, so as to seal the connecting position between the two, improve the sealing property between basin type insulating seat 9 and busbar cylinder 11, and high voltage lead-in end seat 10 is located in busbar cylinder 11, and one end of busbar cylinder 11 is fixed on transformer;Sealing cover 13 is arranged on the other end of busbar cylinder 11;Sealing pad is arranged between busbar cylinder 11 and sealing cover 13 and between busbar cylinder 11 and transformer, so as to increase the sealing property of busbar cylinder 11.

[0041] The outer wall of the conical cylinder 5 is provided with a gas delivery pipe 50, and a gas pump is connected to the gas delivery pipe 50. The gas delivery pipe 50 and the gas pump are provided with a control valve. The control valve controls the flow of the insulating gas that can be filled or discharged, so as to perform a leakage test or an insulation test on the out-of-line bushing to be detected. The inner wall of the basin-type insulation seat 9 is provided with a gas passage hole. The gas passage hole communicates the internal space of the basin-type insulation seat 9 with the internal space of the busbar cylinder 11. The gas pump delivers the insulating gas with a pressure of 0.3 MPa-0.5 MPa into the conical cylinder 5 through the gas delivery pipe 50 and removes the air in the conical cylinder 5, so that the conical cylinder 5, the busbar cylinder 11, and the basin-type insulation seat 9 are filled with the insulating gas for insulation. In this way, during the test process, the electric arc generated on the busbar of the transformer is prevented from being introduced onto the adapter transition conductor 6 through the basin-type insulation seat 9, so as to avoid damaging the adapter transition conductor 6 and other components and improve the safety of the test. In the embodiment, the insulating gas is one or more of sulfur hexafluoride, sulfur tetrafluoride, and trifluoroiodomethane, and sulfur hexafluoride is preferred.

[0042] As shown in Figure 1 and Figure 2 , the top end surface of the adapter transition conductor 6 is provided with a second mounting groove 62 along the axial direction thereof. The bottom of the second mounting groove 62 communicates with the cavity inside the adapter transition conductor 6. A spring groove 60 is arranged in the second mounting groove 62 and close to the top of the cavity inside the adapter transition conductor 6. A spring 14 is arranged in the spring groove 60. The out-of-line bushing to be detected is inserted into the spring 14 from the top of the adapter transition conductor 6. The end of the out-of-line bushing to be detected is fixed by the spring 14, so as to improve the convenience of installation.

[0043] As shown in Figures 1-5 , the bottom of the adapter transition conductor 6 is provided with a first mounting groove 61. An electrical connection assembly is connected in the first mounting groove 61. The electrical connection assembly includes a transition pad 7 and a fixed embedding block 8. The fixed embedding block 8 is embedded in the bottom of the basin-type insulation seat 9. The top of the fixed embedding block 8 is inserted into the first mounting groove 61. The bottom of the transition pad 7 is arranged on the top of the fixed embedding block 8. The top of the transition pad 7 is fixedly connected with the first mounting groove 61.

[0044] As shown in Figure 1As shown, the top end face of the conical cylinder 5 is bolted with a transition flange 4, a sealing gasket is arranged between the bottom end face of the transition flange 4 and the top end face of the conical cylinder 5, the top end face of the transition flange 4 is connected with a connecting piece, the connecting piece is a fixed flange 12, the fixed flange 12 is fixed on the transition flange 4 by bolts, a sealing gasket is arranged between the transition flange 4 and the fixed flange 12, the fixed flange 12 is connected with the out-line sleeve to be detected, through the cooperation of the transition flange 4 and the fixed flange 12, the stability of the out-line sleeve to be detected and the conical cylinder 5 is increased, the out-line sleeve to be detected includes a conductive rod 3 and a porcelain sleeve 1, the conductive rod 3 is inserted into the porcelain sleeve 1, one end of the conductive rod 3 is inserted into a spring 14 installed on the top end of the adapter transition conductor 6, and the one end of the conductive rod 3 is fixed by the spring 14; the end of the porcelain sleeve 1 close to the conical cylinder 5 is fixed with the fixed flange 12 by thread connection; a grounding shield wire 2 is arranged between the conductive rod 3 and the porcelain sleeve 1, the grounding shield wire 2 is fixed on the transition flange 4, the out-line sleeve to be detected and the electric field around the conical cylinder 5 are kept consistent through the grounding shield wire 2, the change of the electric field is reduced, and the accuracy of the test data is improved.

[0045] The installation process of the device is as follows: first, the conical cylinder 5 is installed on the basin type insulating seat 9, then the fixed embedded block 8 is installed in the connecting groove arranged on the basin type insulating seat 9, then the transition pad 7 is installed on the top end of the fixed embedded block 8, after that, the adapter transition conductor 6 is installed on the transition pad 7, the bottom end of the fixed embedded block 8 and the transition pad 7 are located in the first installation groove 61 arranged at the bottom of the adapter transition conductor 6, the bus cylinder 11 is installed at the bottom of the basin type insulating seat 9, the high-voltage lead-in end seat 10 is connected on the bottom end face of the fixed embedded block 8 in the bus cylinder 11, the bus cylinder 11 is fixed on the transformer, and the other end of the bus cylinder 11 is installed with a sealing cover 13.

[0046] Secondly, the out-line sleeve to be detected is connected with the device, the inner connection is that the extension part of the conductive rod 3 of the out-line sleeve is inserted into the spring groove 60 arranged at the top end of the adapter transition conductor 6, the conductive rod 3 is in close contact with the adapter transition conductor 6 by the extrusion of the spring 14, so that good electrical contact is obtained, the grounding shield wire 2 is fixed on the transition flange 4 connected with the top end face of the conical cylinder 5 by screws; the outer connection is that the fixed flange 12 installed on the outside of the porcelain sleeve 1 in the out-line sleeve is connected with the transition flange 4 connected with the top end face of the conical cylinder 5, after the inner and outer connections are completed, the whole installation process is completed.

[0047] Then, the air pump is connected with the valve installed on the gas conveying pipe 50, the air pump is started to vacuumize the conical cylinder 5, the basin type insulating base 9 and the busbar cylinder 11, then the sulfur hexafluoride with the pressure of 0.3MPa~0.5MPa is input, the various test voltages such as the lightning impact withstand voltage, the operating impact withstand voltage and the power frequency voltage required by the standard are applied to the end of the outgoing line sleeve, and the factory test is completed.

[0048] The basic principle and main features of the present application and the advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0049] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand. The above content only illustrates the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification made on the basis of the technical solutions according to the technical idea of the present application falls within the protection scope of the claims of the present application.

Claims

1. A transfer transition device for a factory test of a cable outlet, characterized by The utility model provides a kind of transformer bushing, including conical cylinder (5), the bottom of the conical cylinder (5) is connected with basin type insulating seat (9), the bottom of the basin type insulating seat (9) is provided with connecting slot, electric connection component is installed in the connecting slot, the top of the electric connection component is fixedly connected with adapter transition conductor (6), the adapter transition conductor (6) is located in the basin type insulating seat (9), the top of the adapter transition conductor (6) is inserted and detected out line bushing, the out line bushing is fixedly connected with the conical cylinder (5); The electric connection component is connected with a high-voltage lead-in end seat (10) at the bottom of the basin type insulating seat (9), and the high-voltage lead-in end seat (10) is connected to the busbar of the transformer.

2. The adapter transition device for a line bushing factory test according to claim 1, wherein The bottom of the basin type insulating seat (9) is provided with an insulation assembly, which includes a busbar cylinder (11). The top of the busbar cylinder (11) is connected to the outer wall of the basin type insulating seat (9). The high-voltage lead-in end seat (10) is located in the busbar cylinder (11), and one end of the busbar cylinder (11) is fixed to the transformer. A sealing cover (13) is provided on the other end of the busbar cylinder (11). A gas pipe (50) is provided on the outer wall of the conical cylinder (5), and a gas pump is connected to the gas pipe (50). The gas pump is used to transport insulation gas into the conical cylinder (5) and to extract air from the conical cylinder (5). An air vent is provided on the inner wall of the basin type insulating seat (9), which communicates the internal space of the basin type insulating seat (9) with the internal space of the busbar cylinder (11).

3. The adapter transition device for a line bushing factory test according to claim 2, wherein, The pressure of the insulation gas is 0.3 MPa to 0.5 MPa.

4. The adapter transition device for outlet bushing factory testing of claim 2, wherein, The insulation gas is one or more of sulfur hexafluoride, sulfur tetrafluoride, and trifluoroiodomethane.

5. The adapter transition device for a line bushing factory test according to claim 1, wherein, A second mounting groove (62) is provided on the top end face of the adapter transition conductor (6), and the bottom of the second mounting groove (62) communicates with the cavity of the adapter transition conductor (6). A spring groove (60) is provided in the second mounting groove (62), and a spring (14) is installed in the spring groove (60). The to-be-detected out line bushing penetrates into the spring (14) from the top of the adapter transition conductor (6). A first mounting groove (61) is provided at the bottom of the adapter transition conductor (6), and the electric connection component is connected in the first mounting groove (61).

6. The adapter transition device for a line bushing factory test according to Claim 1, wherein A transition flange (4) is connected to the top of the conical cylinder (5), and the top of the transition flange (4) is connected to the to-be-detected out line bushing through a connecting piece.

7. The adapter transition device for a line bushing factory test according to Claim 6, wherein The to-be-detected out line bushing includes a conductive rod (3) and a porcelain sleeve (1), the conductive rod (3) is inserted into the porcelain sleeve (1), and one end of the conductive rod (3) is inserted into the top of the adapter transition conductor (6). The connecting piece is provided on the porcelain sleeve (1). A grounding shield wire (2) is provided between the conductive rod (3) and the porcelain sleeve (1), and the grounding shield wire (2) is fixed to the transition flange (4).

8. The adapter transition device for a line bushing factory test according to Claim 7, wherein The connecting piece is a fixed flange (12) sleeved on the porcelain sleeve (1) and connected with the porcelain sleeve (1) through threads, and the fixed flange (12) is fixed on the transition flange (4) through bolts.

9. The adapter transition device for a line bushing factory testing according to claim 8, wherein, A sealing gasket is arranged between the transition flange (4) and the fixed flange (12).

10. The adapter transition device for a line bushing factory test according to claim 5, wherein, The electric connecting assembly comprises a transition pad (7) and a fixed block (8), the fixed block (8) is embedded in the bottom of the basin-type insulating base (9), the top of the fixed block (8) is sleeved in the first mounting groove (61), and the bottom of the transition pad (7) is mounted on the top of the fixed block (8).

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